4.8 Review

Fluorine-Free MXenes: Recent Advances, Synthesis Strategies, and Mechanisms

Related references

Note: Only part of the references are listed.
Article Materials Science, Multidisciplinary

Electrochemically modulated interaction of MXenes with microwaves

Meikang Han et al.

Nature Nanotechnology (2023)

Article Nanoscience & Nanotechnology

Selective Etching of Ti3AlC2 MAX Phases Using Quaternary Ammonium Fluorides Directly Yields Ti3C2TZ MXene Nanosheets: Implications for Energy Storage

Vrushali Kotasthane et al.

Summary: MXene synthesis often involves the use of toxic chemicals, limiting its scalability. To overcome this challenge, a safer method is proposed using a mixture of tetramethylammonium fluoride tetrahydrate and hydrochloric acid at room temperature for simultaneous etching and exfoliation. This method results in high MXene yields and MXenes with stable pseudocapacitive behavior and slower degradation rate.

ACS APPLIED NANO MATERIALS (2023)

Article Nanoscience & Nanotechnology

Freeing Fluoride Termination of Ti3C2TX via Electrochemical Etching for High-Performance Capacitive Deionization

Aniu Qian et al.

Summary: An electrochemically etched strategy is proposed to synthesize -F-free Ti3C2Tx, which exhibits enhanced hydrophilicity and ion transport. The resulting CDI device shows high salt removal capacity and can generate electric current to power a red light-emitting diode.

ACS APPLIED MATERIALS & INTERFACES (2023)

Article Materials Science, Multidisciplinary

Preparation of Mo2CTX MXene as co-catalyst for H2 production by etching of pure/mixed HBr solution

Fengling Wang et al.

Summary: This article introduces a new method for preparing highly pure MXene by etching with HBr or a mixture of HBr and other salts. The resulting Mo2CTX is terminated by Br/O and shows excellent co-catalytic properties in enhancing the photocatalytic performance of CdS for H2 production.

DIAMOND AND RELATED MATERIALS (2023)

Article Electrochemistry

Electrochemical characterization of Ti3C2Tx MXene prepared via a molten salt etching route in an acetonitrile-based electrolyte

Liyuan Liu et al.

Summary: Two-dimensional metal carbide and nitride materials (MXenes) with controlled Cl- and O-surface terminations (MS-Ti3C2Tx) were prepared using a molten salt etching method and their electrochemical properties were investigated in nitrile-based electrolytes. The results showed that the power performance of MS-Ti3C2Tx was significantly improved in acetonitrile (ACN)-based non-aqueous organic electrolytes, which are commonly used electrolytes for electrochemical capacitors. The addition of a lithium salt, resulting in 2 M LiTFSI in ACN, increased the specific capacitance. Moreover, replacing LiTFSI with LiFSI greatly enhanced the power performance of MXenes at a high scan rate (95 mAh g-1 at 900C). These findings emphasize the importance of matching the electrolyte composition to the electrode material and offer insights into the potential of MXenes as high-rate electrode materials for energy storage applications.

ELECTROCHEMISTRY COMMUNICATIONS (2023)

Article Chemistry, Physical

Post-Ammonia-Treated V2CTX MXene at Different Pressures: Effects on Morphology, Electronic, and Optical Properties

Monidipa Pramanik et al.

Summary: In this study, vanadium carbide (V(2C)Tx) MXene was successfully synthesized and treated with an ammonia solution under different pressures using a hydrothermal process. The results show that the morphology of V(2)CTx MXene changed from uneven multilayered micrometre-size sheets to uniform few-layered nanometer-size sheets as the pressure increased. The optical and electronic properties were influenced by nitrogen-related defects, quantum confinement, and induced lattice strain due to the post-ammonia treatment.

JOURNAL OF PHYSICAL CHEMISTRY C (2023)

Article Materials Science, Multidisciplinary

Fluorine-free mechanochemical synthesis of MXene

Gabrijela Ljubek et al.

Summary: MXene is a 2D transition metal carbide/nitride with excellent electrical, optical and mechanical properties. However, the current method of chemical etching for MXene preparation is limited due to the hazardous and toxic reagents. Therefore, it is urgent to explore safe and reliable synthetic methods for MXene preparation.

MATERIALS SCIENCE AND TECHNOLOGY (2023)

Article Chemistry, Multidisciplinary

Fluorine- and Acid-Free Strategy toward Scalable Fabrication of Two-Dimensional MXenes for Sodium-Ion Batteries

Yongling An et al.

Summary: A physical vacuum distillation strategy is proposed to directly synthesize fluoride-free MXenes, which is a green and one-step process without the use of fluoride and acid. The synthesized MXenes have controlled layered structures and specific surface areas, and the Ti3C2T x MXene exhibits improved sodium storage performance.

NANO LETTERS (2023)

Article Chemistry, Physical

Intrinsic strong light-matter coupling with self-hybridized bound states in the continuum in van der Waals metasurfaces

Thomas Weber et al.

Summary: In this study, strong coupling in bound state in the continuum metasurfaces on nanostructured bulk WS2 is demonstrated, with sharp resonances, tailored linewidths, and controllable light-matter coupling strength.

NATURE MATERIALS (2023)

Article Polymer Science

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti2CTx MXene reinforced polyvinyl alcohol nanocomposites

Subhasree Panda et al.

Summary: Ti(2)CTx MXene-Polyvinyl alcohol (PVA) nanocomposite films with different weight percent (wt%) of MXene loadings were successfully prepared using the solution casting method, and their structural, morphological, optical, thermal, and tensile properties were analyzed. The dielectric constant, loss tangent, and AC conductivity of the nanocomposite films were found to vary with temperature and MXene concentrations, and the complex impedance spectroscopy studies were also carried out.

POLYMERS FOR ADVANCED TECHNOLOGIES (2023)

Article Multidisciplinary Sciences

Direct synthesis and chemical vapor deposition of 2D carbide and nitride MXenes

Di Wang et al.

Summary: Two-dimensional transition-metal carbides and nitrides (MXenes) are extensively studied materials with diverse applications in energy storage. We demonstrate a direct synthesis route for scalable and atom-economic production of MXenes, including previously unattainable compounds, by reactions of metals and metal halides with graphite, methane, or nitrogen. The directly synthesized MXenes exhibit excellent energy storage capacity for lithium-ion intercalation, and their growth can be controlled to form unique morphologies such as carpets and spherulites.

SCIENCE (2023)

Article Engineering, Chemical

Fluorine-free MXene activate peroxymonosulfate to remove tetracyclic antibiotics

Feng Wang et al.

Summary: Fluorine-free MXene was successfully synthesized by etching the Al layer of MXene using a safer and more environmentally friendly tetramethylammonium hydroxide solution. The prepared fluorine-free MXene exhibited excellent hydrophilicity, more active surface sites, and superior degradation performance of tetracycline hydrochloride compared to fluorine-containing MXene. It also showed high degradation efficiency for doxycycline and oxytetracycline, as well as good reusability and mineralization efficiency.

SEPARATION AND PURIFICATION TECHNOLOGY (2023)

Article Chemistry, Physical

Hierarchical Porous N-doped Carbon Encapsulated Fluorine-free MXene with Tunable Coordination Chemistry by One-pot Etching Strategy for Lithium-Sulfur Batteries

Xinlu Zhang et al.

Summary: A novel one-pot etching strategy is used to fabricate fluorine-free Ti3C2Tx nitrogen encapsulated hierarchical porous carbon with tunable coordination chemistry. Through phase reconstruction, Ti coordinated with N is identified. Hierarchical porous nitrogen-doped carbons (HPNC) significantly increase material surface area, enhancing redox kinetics and physical immobilization of lithium polysulfides. The modified MXene separator shows a reversible capacity of 889.5 mA h g(-1) with capacity retention of 79.5% after 100 cycles at 0.5 A g(-1). This work provides a novel etching strategy to explore the correlation between structural and electrochemical properties.

ADVANCED ENERGY MATERIALS (2023)

Article Chemistry, Physical

Biocompatible and Oxidation-Resistant Ti3C2Tx MXene with Halogen-Free Surface Terminations

Jaeeun Yoon et al.

Summary: Surface chemistry of MXene nanomaterials plays a crucial role in their physicochemical properties, safety, and applications. This study successfully synthesized well-delaminated halogen-free Ti3C2Tx flakes using a NaOH-based etching solution, which showed a red-shifted surface plasmon mode and a different density of state compared to conventional HF-based etched fluorinated Ti3C2Tx MXene. The halogen-free Ti3C2Tx MXene exhibited higher biocompatibility, lower water contact angle, and lower work function than the fluorinated counterpart, making it a promising candidate for biomedical applications.

SMALL METHODS (2023)

Article Chemistry, Physical

Tailoring the plasmonic properties of gold-liposome nanohybrids as a potential powerful tool for light-mediated therapies

Jiana Hu et al.

Summary: In this study, double-layered MXene-Fe/CNT/SR composites were successfully synthesized via a green and facile method. The composites exhibited excellent microwave absorption properties due to appropriate impedance matching, strengthened internal reflection, polarization, magnetic loss, and conductive loss. The developed composites have great potential for high-performance microwave absorption applications.

CARBON (2023)

Review Chemistry, Multidisciplinary

Phase Engineering of 2D Materials

Dohyun Kim et al.

Summary: Polymorphic 2D materials enable the engineering of structural and electronic phases, facilitating energy-efficient, cost-effective, and scalable device applications. Phase engineering encompasses not only conventional transitions but also magnetic states, correlated band structures, and topological phases in various 2D materials. This review explores the precise manipulation and patterning of local phases, especially at ideal and versatile phase interfaces, for electronic and energy device applications. This research emphasizes the potential of phase patterning in emerging 2D materials in the development of breakthroughs in electronic, quantum, and energy devices.

CHEMICAL REVIEWS (2023)

Article Energy & Fuels

Effect of temperature and atmosphere on V2AlC etching for V2CTx MXenes synthesis used as anode for Li-ion storage systems

Motahare S. Mohseni-Salehi et al.

Summary: This study examined the impact of Ar-controlled atmosphere on the etching of V2AlC MAX phase and its electrochemical properties for Li-ion storage. The etching process conducted at room temperature in an ambient atmosphere showed incomplete etching due to oxidation. However, etching in an Ar-controlled atmosphere at different temperatures (9, 25, and 40 degrees C) demonstrated that increasing the temperature was necessary for completing the etch reaction. Additionally, controlling the temperature during the MAX phase addition prevented the formation of an oxide layer, allowing for better etching results. The discharge capacity of Li-ion storage for V2CTx etched in an Ar-controlled atmosphere at 9 + 40 degrees C was 500.5 mAh g-1 for the first cycle and 388.5 mAh g-1 after 100 cycles with 99.4% coulombic efficiency.

JOURNAL OF ENERGY STORAGE (2023)

Article Chemistry, Multidisciplinary

Exfoliation and Delamination of Ti3C2Tx MXene Prepared via Molten Salt Etching Route

Liyuan Liu et al.

Summary: This study reports a successful method for exfoliating MS-Ti3C2Tx, resulting in a self-supported chlorinated MXene film, through intercalation of the organic molecule TBAOH and sonication. The experimental results show that tuning the surface chemistry of MXene has a significant impact on electrochemical performance, leading to improved specific capacity and rate capability in Li-ion battery application.

ACS NANO (2022)

Article Chemistry, Multidisciplinary

Simplified Synthesis of Fluoride-Free Ti3C2Tx via Electrochemical Etching toward High- Performance Electrochemical Capacitors

Jizhang Chen et al.

Summary: A facile and time-saving electrochemical etching method is developed to synthesize F-free and Cl-containing Ti3C2Tx. Sonification alone is able to delaminate Ti3C2Tx without using any hazardous organic intercalant. The obtained Ti3C2Tx flakes exhibit suitable size and stability, and show excellent performance in supercapacitors and hybrid capacitors.

ACS NANO (2022)

Article Engineering, Environmental

Fluorine-free strategy for hydroxylated Ti3C2/Ti3AlC2 catalysts with enhanced aerobic oxidative desulfurization and mechanism

Qingxiao Zhang et al.

Summary: Hydroxylated catalysts were prepared via alkaline etching, exhibiting excellent activity and recyclability in the oxidative desulfurization reaction.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Physics, Applied

Controlled CVD growth of ultrathin Mo2C (MXene) flakes

Merve Oper et al.

Summary: This study aims to grow thin and large area Mo2C flakes in a controlled manner by using chemical vapor deposition. The effects of factors such as CH4 flow, precursor/catalyst ratio, and flow rates of carrier gas on the growth of Mo2C structures were investigated. Results show that control over thickness and substrate coverage of Mo2C flakes can be achieved by adjusting process parameters.

JOURNAL OF APPLIED PHYSICS (2022)

Article Chemistry, Physical

Termination effects of single-atom decorated v-Mo2CTx MXene for the electrochemical nitrogen reduction reaction

Xingwu Zhai et al.

Summary: This study investigates the NRR catalytic performance of single atoms decorated v-Mo2CT2 MXene using DFT calculations. Results show that single atom introduction improves NRR activity and selectivity, with Ir@v-Mo2CO2 having the lowest limiting potential. A relationship between the adsorption energy of *NNH species and NRR activity is proposed.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)

Article Materials Science, Multidisciplinary

Bottom-up, scalable synthesis of anatase nanofilament-based two-dimensional titanium carbo-oxide flakes

Hussein O. Badr et al.

Summary: By using a bottom-up approach, we have successfully converted 10 different materials into two-dimensional flakes with carbon-containing anatase-based layers. These flakes exhibit excellent electrode performance in lithium-ion and lithium-sulfur systems, and also show potential in reducing the viability of cancer cells.

MATERIALS TODAY (2022)

Article Chemistry, Multidisciplinary

Fluorine-Free Fabrication of MXene via Photo-Fenton Approach for Advanced Lithium-Sulfur Batteries

Lin Liang et al.

Summary: This paper presents a method for fabricating high-purity F-free Ti3C2 using the photo-Fenton reaction, which can serve as an ideal material for advanced flexible Li-S batteries.

ACS NANO (2022)

Article Energy & Fuels

HF free greener Cl-terminated MXene as novel electrocatalyst for overall water splitting in alkaline media

Bilal Sarfraz et al.

Summary: This study presents a greener synthesis method for MXene and demonstrates its excellent electrochemical characteristics as an overall water-splitting catalyst. The Cl-terminated MXene shows higher reaction activity and stability for oxygen and hydrogen evolution reactions compared to HF-MXene.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH (2022)

Article Chemistry, Physical

Molten salt method synthesis of multivalent cobalt and oxygen vacancy modified Nitrogen-doped MXene as highly efficient hydrogen and oxygen Evolution reaction electrocatalysts

Xunxin Chen et al.

Summary: Nitrogen-doped Ti3C2Ty MXene with multivalent cobalt and oxygen vacancy modification was prepared using a molten salt method, leading to improved electrocatalytic performance. The structural properties of MXene and the valence state of cobalt were adjusted by controlling the molten salt temperature. Electrochemical tests showed that the nitrogen-doped MXene exhibited good electrocatalytic stability.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)

Review Chemistry, Multidisciplinary

MXene chemistry, electrochemistry and energy storage applications

Xinliang Li et al.

Summary: The diverse and tunable surface and bulk chemistry of MXenes have valuable and distinctive properties that can be utilized in various components of energy storage devices such as electrodes, electrolytes, and separators. They enhance stability and performance through ion storage, transfer regulation, steric hindrance, and electrocatalytic functions.

NATURE REVIEWS CHEMISTRY (2022)

Article Chemistry, Physical

Synthesis of fluorine free MXene through lewis acidic etching for application as electrode of proton supercapacitors

Ubaid Khan et al.

Summary: MXenes, 2D materials dominated by carbides and nitrides, can be tailored for various applications by tuning surface chemistry. In this study, fluorine-free Ti3C2 MXenes with halogen terminals were synthesized using a molten salts synthesis method, exhibiting exceptional supercapacitive performances as electrodes in aqueous electrolytes.

JOURNAL OF ALLOYS AND COMPOUNDS (2022)

Article Chemistry, Physical

Synthesis and in situ sulfidation of molybdenum carbide MXene using fluorine-free etchant for electrocatalytic hydrogen evolution reactions

Binesh Unnikrishnan et al.

Summary: This article presents a simple fluorine-free exfoliation and two-step vulcanization method for synthesizing molybdenum sulfide-modified molybdenum carbide MXene, which exhibits excellent electrocatalytic hydrogen evolution performance in alkaline medium. The sulfidation method demonstrated in this study is capable of producing amorphous MoS2 structures on Mo2CTx MXene, enhancing stability and electrocatalytic activity.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)

Article Materials Science, Multidisciplinary

Photothermal property investigation of V2CTx MXene and its use for all-optical modulator

Suh-Young Kwon et al.

Summary: This study demonstrates the photothermal and nonlinear absorption properties of V2CTx MXene and shows the application of photothermal effect-based polarization rotation in all-optical signal modulation. Through experiments and calculations, key parameters of V2CTx MXene, such as nonlinear absorption coefficient, power-dependent temperature slope, and conversion efficiency of phase shift, are determined.

OPTICAL MATERIALS (2022)

Article Materials Science, Multidisciplinary

One-step fluorine-free synthesis of delaminated, OH-terminated Ti3C2: High photocatalytic NOx storage selectivity enabled by coupling TiO2 and Ti3C2-OH

Ahmed Al Mayyahi et al.

Summary: In this study, delaminated and OH-terminated MXene was synthesized through a one-step hydrothermal process. The co-catalytic effect of this MXene combined with TiO2 was found to be highly effective in photocatalytic oxidation of NOx. The OH-terminated MXene outperformed the F-terminated MXene in terms of NO2 storage selectivity and DeNOx index.

MATERIALS TODAY COMMUNICATIONS (2022)

Article Chemistry, Physical

Molten Salts Etching Route Driven Universal Construction of MXene/Transition Metal Sulfides Heterostructures with Interfacial Electronic Coupling for Superior Sodium Storage

Pengfei Huang et al.

Summary: A novel strategy for fabricating Ti3C2Tx MXene/transition metal sulfides (MSy) heterostructures via Lewis acidic molten salts etching and sulfurization treatment is presented, leading to remarkably improved electronic conductivity, Na+ migration kinetics, and outstanding electrochemical performance. The Ti3C2Tx/FeS2 heterostructure demonstrates excellent rate performance and long-term cyclic stability when used as SIB anodes, showcasing the potential of MXene-based heterostructures in energy storage applications.

ADVANCED ENERGY MATERIALS (2022)

Proceedings Paper Materials Science, Multidisciplinary

Synthesis and Characterization of MXene from MAX phase

Arijit Ghosh et al.

Summary: This article describes a technique to prepare MXene materials by removing aluminum from the MAX phase, and characterizes them in terms of crystal structure, morphology, elemental analysis, and optical band gap determination.

MATERIALS TODAY-PROCEEDINGS (2022)

Review Chemistry, Physical

Surface engineering of MXenes for energy and environmental applications

Tongming Su et al.

Summary: MXenes, a family of two-dimensional materials with intriguing properties, have great potential in energy and environmental applications. Surface engineering plays a crucial role in the successful application of MXenes, and the surface composition of MXenes significantly affects their physicochemical properties and functionalities.

JOURNAL OF MATERIALS CHEMISTRY A (2022)

Article Chemistry, Physical

Fluorine-free synthesis of ambient-stable delaminated Ti2CTx (MXene)

Ni Xue et al.

Summary: Compared with the widely used star material Ti3C2Tx, Ti2CTx has unique and attractive performance in many fields but is hindered by poor environmental instability. The stability of MXenes is related to the terminal groups. It is found that oxygen-rich terminal groups can improve the stability of Ti2CTx, and a method to prepare fluorine-free Ti2CTx with oxygen-rich terminals is proposed.

JOURNAL OF MATERIALS CHEMISTRY A (2022)

Article Chemistry, Multidisciplinary

Covalent Surface Modification of Ti3C2Tx MXene with Chemically Active Polymeric Ligands Producing Highly Conductive and Ordered Microstructure Films

Jacob T. Lee et al.

Summary: Covalently attaching polyethylene glycol carboxylic acid (PEG6-COOH) onto MXenes surfaces greatly enhances their dispersibility in various nonpolar organic solvents, allowing for the formation of ordered thin films with excellent electrical conductivity.

ACS NANO (2021)

Article Chemistry, Multidisciplinary

Halogenated Ti3C2 MXenes with Electrochemically Active Terminals for High-Performance Zinc Ion Batteries

Mian Li et al.

Summary: Experimental exploration of various halogen terminals on the surface of Ti3C2 MXenes showed that the presence of Br and I elements resulted in improved electrochemical performance for aqueous zinc ion batteries. The Lewis-acidic-melt etching route proved to be effective in tuning the surface chemistry of MXenes for expanding their potential applications.

ACS NANO (2021)

Article Chemistry, Multidisciplinary

MXene-Copper/Cobalt Hybrids via Lewis Acidic Molten Salts Etching for High Performance Symmetric Supercapacitors

Yang Bai et al.

Summary: MXenes have been studied for their potential as supercapacitors due to their conductivity, density, and hydrophilic nature. Ti3C2-Cu/Co hybrids were synthesized and characterized, showing promising pseudocapacitive behavior and stability for applications in supercapacitors. This work provides insights into the design and application of MXene-based materials for energy storage devices.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Multidisciplinary

Ambient-Stable Two-Dimensional Titanium Carbide (MXene) Enabled by Iodine Etching

Huanhuan Shi et al.

Summary: The study demonstrated a fluoride-free, iodine-assisted etching route for preparing oxygen-rich two-dimensional MXene with intact lattice structure. These MXene sheets exhibit excellent thin-film conductivity and great ambient stability in water, showing promise for practical applications.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Physical

Functionalizing MXenes by Tailoring Surface Terminations in Different Chemical Environments

Jonas Bjork et al.

Summary: MXenes are a group of materials that have attracted attention in areas such as energy storage, superconductivity, and catalysis due to their chemical versatility. The surface terminations, which can consist of various elements, play a significant role in governing the properties of MXenes. However, further research is needed to understand the stability of different terminations in various chemical environments.

CHEMISTRY OF MATERIALS (2021)

Article Chemistry, Multidisciplinary

Halogen Etch of Ti3AlC2 MAX Phase for MXene Fabrication

Ali Jawaid et al.

Summary: A new room-temperature etching method using halogens in anhydrous media can synthesize MXenes from Ti3AlC2, providing opportunities for controlled surface chemistries to modulate MXene properties. The radical-mediated process strongly depends on various factors, such as the molar ratio of halogen to MAX phase, concentration of halogen, solvent, and temperature.

ACS NANO (2021)

Article Chemistry, Multidisciplinary

Ultrafast, One-Step, Salt-Solution-Based Acoustic Synthesis of Ti3C2 MXene

Ahmed El Ghazaly et al.

Summary: This study presents a one-step synthesis method for the conversion from Ti3AlC2 MAX to Ti3C2Tz MXene on the order of milliseconds, facilitated by the combination of protons and fluorine ions to selectively etch the MAX phase. The results demonstrate that flexible electrodes fabricated using this method exhibit comparable electrochemical performance to previously reported ones.

ACS NANO (2021)

Article Chemistry, Multidisciplinary

High-Entropy 2D Carbide MXenes: TiVNbMoC3 and TiVCrMoC3

Srinivasa Kartik Nemani et al.

Summary: A study reports the synthesis of multi-principal-element high-entropy M4C3Tx MXenes, including two new high-entropy MXenes and their precursor MAX phases. The research utilized various characterization techniques to determine the structure and distribution of four transition metals in high-entropy MAX and MXene phases, along with first-principles calculations for formation energies. Experimental results show that using three transition metals instead of four can lead to the formation of two different MAX phases under similar synthesis conditions, highlighting the significance of configurational entropy in stabilizing high-entropy MAX phases.

ACS NANO (2021)

Article Chemistry, Multidisciplinary

Development of Fluorine-Free Tantalum Carbide MXene Hybrid Structure as a Biocompatible Material for Supercapacitor Electrodes

Alireza Rafieerad et al.

Summary: Innovative synthesis of Ta4C3Tx MXene-tantalum oxide (TTO) hybrid structure was demonstrated, showing potential for TTO composite as an efficient biocompatible material for supercapacitor electrodes. The TTO electrode exhibited long-term stability and high energy-storage performance, outperforming previous biomaterial-based supercapacitors.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

HCl-Based Hydrothermal Etching Strategy toward Fluoride-Free MXenes

Changda Wang et al.

Summary: MXenes are promising electrode materials in energy generation and storage due to their ultrathin layered structure and rich elemental variety, but the presence of fluoride in traditional synthesis methods leads to performance decline. Density functional theory calculations demonstrate the etching feasibility of hydrochloric acid on MAX phases, and the successful preparation of high-efficiency fluoride-free Mo2C MXenes with excellent electrochemical performance is achieved.

ADVANCED MATERIALS (2021)

Review Chemistry, Multidisciplinary

Advances in the Synthesis of 2D MXenes

Yi Wei et al.

Summary: MXenes, versatile materials with adjustable structures and rich surface chemistry, have been recognized as potential 2D materials for various applications. Recent research has focused on synthetic routes, etching methods, and delamination strategies for large-scale preparation and stable storage. Antioxidation strategies for MXenes have also been summarized for future developments and practical applications.

ADVANCED MATERIALS (2021)

Article Materials Science, Ceramics

UV-assisted safe etching route for the synthesis of Mo2CTx MXene from Mo-In-C non-MAX phase

Tijin Thomas et al.

Summary: This study reported the synthesis of Mo2CTx MXene using UV-assisted safe etching in phosphoric acid followed by ultrasonic exfoliation from the Mo-In-C non-MAX phase. The selective etching of indium and structural characterization confirmed the formation of Mo2CTx MXene. The method used in this study unlocks the opportunity for industrial bulk production of MXenes.

CERAMICS INTERNATIONAL (2021)

Article Multidisciplinary Sciences

Two-dimensional molybdenum carbide 2D-Mo2C as a superior catalyst for CO2 hydrogenation

Hui Zhou et al.

Summary: Early transitional metal carbides, such as 2D-Mo2C, show promising catalytic activity for CO2 hydrogenation through surface group manipulation, resulting in tunable selectivity and activity for the reaction. This study highlights the importance of surface termination groups in controlling the performance of carbide catalysts for CO2 conversion to value-added chemicals.

NATURE COMMUNICATIONS (2021)

Review Engineering, Electrical & Electronic

A Comprehensive Review on Recent Advances in Two-Dimensional (2D) Hexagonal Boron Nitride

Mohammad Jafar Molaei et al.

Summary: 2D-hBN is an emerging 2D material with exceptional properties, which can be integrated with other 2D materials for next-generation electronic and optoelectronic devices. Various synthesis methods are available, and it finds versatile applications in graphene electronics, tunneling barrier, sensors, etc.

ACS APPLIED ELECTRONIC MATERIALS (2021)

Article Chemistry, Multidisciplinary

One-Pot Green Process to Synthesize MXene with Controllable Surface Terminations using Molten Salts

Miao Shen et al.

Summary: A new molten-salt-assisted electrochemical etching method was developed to synthesize fluorine-free Ti3C2Cl2, allowing for the modification of surface terminations and enhancement of electrode material performance.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Physical

Hierarchical few-layer fluorine-free Ti3C2TX (T = O, OH)/MoS2 hybrid for efficient electrocatalytic hydrogen evolution

Mingming Li et al.

Summary: The study utilized few-layer fluorine-free Ti3C2TX (T = O, OH) as a conductive substrate for MoS2, which successfully improved the performance of HER catalysts with enhanced electrical conductivity, increased active sites, and optimized mass-transport channels.

JOURNAL OF MATERIALS CHEMISTRY A (2021)

Article Chemistry, Inorganic & Nuclear

Achieving Macroscopic V4C3Tx MXene by Selectively Etching Al from V4AlC3 Single Crystals

Dong Wang et al.

INORGANIC CHEMISTRY (2020)

Article Nuclear Science & Technology

Ion sputtering for preparation of thin MAX and MXene phases

J. Vacik et al.

RADIATION EFFECTS AND DEFECTS IN SOLIDS (2020)

Article Chemistry, Multidisciplinary

Beyond Ti3C2Tx: MXenes for Electromagnetic Interference Shielding

Meikang Han et al.

ACS NANO (2020)

Article Chemistry, Physical

Raman Spectroscopy Analysis of the Structure and Surface Chemistry of Ti3C2Tx MXene

Asia Sarycheva et al.

CHEMISTRY OF MATERIALS (2020)

Article Nanoscience & Nanotechnology

Direct visualization of out-of-equilibrium structural transformations in atomically thin chalcogenides

Pawan Kumar et al.

NPJ 2D MATERIALS AND APPLICATIONS (2020)

Article Engineering, Environmental

Thermal reduction of sulfur-containing MAX phase for MXene production

Jun Mei et al.

CHEMICAL ENGINEERING JOURNAL (2020)

Article Multidisciplinary Sciences

Covalent surface modifications and superconductivity of two-dimensional metal carbide MXenes

Vladislav Kamysbayev et al.

SCIENCE (2020)

Article Green & Sustainable Science & Technology

Two-dimensional fluorine-free mesoporous Mo2C MXene via UV-induced selective etching of Mo2Ga2C for energy storage

Jun Mei et al.

SUSTAINABLE MATERIALS AND TECHNOLOGIES (2020)

Article Nanoscience & Nanotechnology

Selective Toluene Detection with Mo2CTx MXene at Room Temperature

Wenzhe Guo et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

Article Chemistry, Multidisciplinary

Tailoring Electronic and Optical Properties of MXenes through Forming Solid Solutions

Meikang Han et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2020)

Article Chemistry, Multidisciplinary

Ionic liquid-based synthesis of MXene

Samantha Husmann et al.

CHEMICAL COMMUNICATIONS (2020)

Article Chemistry, Multidisciplinary

Role of acid mixtures etching on the surface chemistry and sodium ion storage in Ti3C2TxMXene

Mark Anayee et al.

CHEMICAL COMMUNICATIONS (2020)

Article Materials Science, Multidisciplinary

Magnetron-sputtering deposited molybdenum carbide MXene thin films as a saturable absorber for passively Q-switched lasers

Jiang Wang et al.

JOURNAL OF MATERIALS CHEMISTRY C (2020)

Article Chemistry, Physical

Effects of Synthesis and Processing on Optoelectronic Properties of Titanium Carbonitride MXene

Kanit Hantanasirisakul et al.

CHEMISTRY OF MATERIALS (2019)

Article Chemistry, Multidisciplinary

Element Replacement Approach by Reaction with Lewis Acidic Molten Salts to Synthesize Nanolaminated MAX Phases and MXenes

Mian Li et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2019)

Article Electrochemistry

Fluorine-free Ti3C2Tx as anode materials for Li-ion batteries

Lujun Huang et al.

ELECTROCHEMISTRY COMMUNICATIONS (2019)

Article Chemistry, Multidisciplinary

Universal Strategy for HF-Free Facile and Rapid Synthesis of Two-dimensional MXenes as Multifunctional Energy Materials

Sin-Yi Pang et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2019)

Editorial Material Chemistry, Multidisciplinary

The Rise of MXenes

Yury Gogotsi et al.

ACS NANO (2019)

Article Chemistry, Physical

Fluorine-free Ti3C2Tx (T = O, OH) nanosheets (∼50-100 nm) for nitrogen fixation under ambient conditions

Tengfei Li et al.

JOURNAL OF MATERIALS CHEMISTRY A (2019)

Article Materials Science, Multidisciplinary

Selective Lithiation-Expansion-Microexplosion Synthesis of Two-Dimensional Fluoride-Free Mxene

Zemin Sun et al.

ACS MATERIALS LETTERS (2019)

Review Physics, Applied

Black phosphorus and its isoelectronic materials

Fengnian Xia et al.

NATURE REVIEWS PHYSICS (2019)

Article Chemistry, Multidisciplinary

Fluorine-Free Synthesis of High-Purity Ti3C2Tx (T=OH, O) via Alkali Treatment

Tengfei Li et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2018)

Article Chemistry, Multidisciplinary

Fluoride-Free Synthesis of Two-Dimensional Titanium Carbide (MXene) Using A Binary Aqueous System

Sheng Yang et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2018)

Article Materials Science, Multidisciplinary

Controlled growth of ultrathin Mo2C superconducting crystals on liquid Cu surface

Dechao Geng et al.

2D MATERIALS (2017)

Article Chemistry, Multidisciplinary

Highly Efficiently Delaminated Single-Layered MXene Nanosheets with Large Lateral Size

Gengnan Li et al.

LANGMUIR (2017)

Article Chemistry, Multidisciplinary

2D molybdenum and vanadium nitrides synthesized by ammoniation of 2D transition metal carbides (MXenes)

Patrick Urbankowski et al.

NANOSCALE (2017)

Article Chemistry, Physical

Electrochemical etching of Ti2AlC to Ti2CTx (MXene) in low-concentration hydrochloric acid solution

W. Sun et al.

JOURNAL OF MATERIALS CHEMISTRY A (2017)

Article Materials Science, Multidisciplinary

Two-dimensional MXene Ti3C2 produced by exfoliation of Ti3AlC2

Aihu Feng et al.

MATERIALS & DESIGN (2017)

Review Nanoscience & Nanotechnology

2D metal carbides and nitrides (MXenes) for energy storage

Babak Anasori et al.

NATURE REVIEWS MATERIALS (2017)

Article Chemistry, Multidisciplinary

Versatile Cutting Method for Producing Fluorescent Ultrasmall MXene Sheets

Zhiqiang Wang et al.

ACS NANO (2017)

Article Chemistry, Physical

Guidelines for Synthesis and Processing of Two-Dimensional Titanium Carbide (Ti3C2TX MXene)

Mohamed Alhabeb et al.

CHEMISTRY OF MATERIALS (2017)

Article Chemistry, Multidisciplinary

Direct Synthesis of Large-Area 2D Mo2C on In Situ Grown Graphene

Dechao Geng et al.

ADVANCED MATERIALS (2017)

Article Chemistry, Physical

Effect of surface termination on ion intercalation selectivity of bilayer Ti3C2T2 (T = F, O and OH) MXene

Golibjon R. Berdiyorov et al.

APPLIED SURFACE SCIENCE (2017)

Article Materials Science, Ceramics

Fabrication and thermal stability of NH4HF2-etched Ti3C2 MXene

Aihu Feng et al.

CERAMICS INTERNATIONAL (2017)

Article Nanoscience & Nanotechnology

Quantum emission from hexagonal boron nitride monolayers

Toan Trong Tran et al.

NATURE NANOTECHNOLOGY (2016)

Article Nanoscience & Nanotechnology

Ti3C2Tx Filler Effect on the Proton Conduction Property of Polymer Electrolyte Membrane

Yahua Liu et al.

ACS APPLIED MATERIALS & INTERFACES (2016)

Article Chemistry, Multidisciplinary

Atomic Defects in Monolayer Titanium Carbide (Ti3C2Tx) MXene

Xiahan Sang et al.

ACS NANO (2016)

Article Chemistry, Multidisciplinary

Antibacterial Activity of Ti3C2Tx MXene

Kashif Rasool et al.

ACS NANO (2016)

Article Chemistry, Multidisciplinary

Highly Conductive Optical Quality Solution-Processed Films of 2D Titanium Carbide

Andrew D. Dillon et al.

ADVANCED FUNCTIONAL MATERIALS (2016)

Article Chemistry, Multidisciplinary

A Two-Dimensional Zirconium Carbide by Selective Etching of Al3C3 from Nanolaminated Zr3Al3C5

Jie Zhou et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2016)

Article Physics, Applied

Electronic properties of freestanding Ti3C2Tx MXene monolayers

A. Miranda et al.

APPLIED PHYSICS LETTERS (2016)

Article Chemistry, Physical

Capacitance of Ti3C2Tx MXene in ionic liquid electrolyte

Zifeng Lin et al.

JOURNAL OF POWER SOURCES (2016)

Article Chemistry, Multidisciplinary

Synthesis of two-dimensional titanium nitride Ti4N3 (MXene)

Patrick Urbankowski et al.

NANOSCALE (2016)

Article Chemistry, Physical

Nanoscale Elastic Changes in 2D Ti3C2Tx (MXene) Pseudocapacitive Electrodes

Jeremy Come et al.

ADVANCED ENERGY MATERIALS (2016)

Article Nanoscience & Nanotechnology

Fabrication of Ti3C2Tx MXene Transparent Thin Films with Tunable Optoelectronic Properties

Kanit Hantanasirisakul et al.

ADVANCED ELECTRONIC MATERIALS (2016)

Article Nanoscience & Nanotechnology

Effect of Synthesis on Quality, Electronic Properties and Environmental Stability of Individual Monolayer Ti3C2 MXene Flakes

Alexey Lipatov et al.

ADVANCED ELECTRONIC MATERIALS (2016)

Article Chemistry, Multidisciplinary

Two-Dimensional, Ordered, Double Transition Metals Carbides (MXenes)

Babak Anasori et al.

ACS NANO (2015)

Article Chemistry, Inorganic & Nuclear

Large-scale delamination of multi-layers transition metal carbides and carbonitrides MXenes

Michael Naguib et al.

DALTON TRANSACTIONS (2015)

Article Chemistry, Physical

Large-area high-quality 2D ultrathin Mo2C superconducting crystals

Chuan Xu et al.

NATURE MATERIALS (2015)

Article Nanoscience & Nanotechnology

Silicene field-effect transistors operating at room temperature

Li Tao et al.

NATURE NANOTECHNOLOGY (2015)

Article Chemistry, Multidisciplinary

Room- Temperature Carbide- Derived Carbon Synthesis by Electrochemical Etching of MAX Phases

Maria R. Lukatskaya et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2014)

Article Electrochemistry

High capacitance of surface-modified 2D titanium carbide in acidic electrolyte

Yohan Dall'Agnese et al.

ELECTROCHEMISTRY COMMUNICATIONS (2014)

Article Chemistry, Multidisciplinary

Role of Surface Structure on Li-Ion Energy Storage Capacity of Two-Dimensional Transition-Metal Carbides

Yu Xie et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2014)

Article Multidisciplinary Sciences

Conductive two-dimensional titanium carbide 'clay' with high volumetric capacitance

Michael Ghidiu et al.

NATURE (2014)

Article Multidisciplinary Sciences

Intercalation and delamination of layered carbides and carbonitrides

Olha Mashtalir et al.

NATURE COMMUNICATIONS (2013)

Article Electrochemistry

MXene: a promising transition metal carbide anode for lithium-ion batteries

Michael Naguib et al.

ELECTROCHEMISTRY COMMUNICATIONS (2012)

Article Chemistry, Multidisciplinary

Two-Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2

Michael Naguib et al.

ADVANCED MATERIALS (2011)

Article Chemistry, Physical

The rise of graphene

A. K. Geim et al.

NATURE MATERIALS (2007)

Article Chemistry, Multidisciplinary

Fabrication Strategy of MXenes through Ionic-Liquid-Based Microemulsions toward Supercapacitor Electrodes

Wei Qi et al.

Summary: A new synthesis strategy for MXenes through ionic liquid-based microemulsions was successfully proposed, achieving efficient preparation of MXenes by optimizing reaction conditions. Annealed MXenes exhibited higher specific capacitance and greater stability compared to unannealed MXenes.