Engineering Morphology and Electron Redistribution of a Ni/WO3 Mott-Schottky Bifunctional Electrocatalyst for Efficient Alkaline Urea Splitting

Article Chemistry, Physical

The polyoxometalates mediated preparation of phosphate-modified NiMoO4_x with abundant O-vacancies for H2 production via urea electrolysis

Yunfeng Qiu et al.

Summary: This study develops a facile and large-scale method to prepare bifunctional HER and UOR electrocatalysts for H-2 production via urea electrolysis in a less-energy saving way.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2023)

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Article Engineering, Environmental

Regulating d-orbital electronic character and HER free energy of VN electrocatalyst by anchoring single atom

Jizheng Feng et al.

Summary: In this study, a Co-VN catalyst was fabricated to improve the alkaline HER performance by atomically implanting Co into VN to regulate its electronic structure. Experimental and theoretical results showed that the downshift of the V-3d band center in Co-VN enhanced the catalyst's activity and maintained stability during long-term HER testing. The proposed regulation strategy could be extended to design other high-performance catalysts.

CHEMICAL ENGINEERING JOURNAL (2023)

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Article Engineering, Environmental

Boosting the hydrogen evolution of layered double hydroxide by optimizing the electronic structure and accelerating the water dissociation kinetics

Hongbo He et al.

Summary: Designing a highly efficient and durable electrocatalyst is crucial for advancing green hydrogen energy. This study presents a Cu2O/CoCu-LDH bilayer electrocatalyst with vertical-aligned nanosheets, exhibiting excellent alkaline HER performance. The Cu2O/CoCu-LDH outperforms Pt/C at 600 mA cm-2, with a low overpotential and Tafel slope. The unique morphology, optimized electronic structure, and enhanced water dissociation kinetics contribute to its superior HER activity.

CHEMICAL ENGINEERING JOURNAL (2023)

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Review Engineering, Environmental

Design strategies of perovskite nanofibers electrocatalysts for water splitting: A mini review

Yaobin Wang et al.

Summary: In this review, the designing strategies and recent advances of perovskite oxide nanofibers as high-performance catalysts for water electrolysis are summarized. The review also discusses the detailed mechanisms and future directions for developing next-generation bifunctional catalysts based on perovskite nanofibers.

CHEMICAL ENGINEERING JOURNAL (2023)

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Article Chemistry, Physical

An electrochemically reconstructed WC/WO2-WO3 heterostructure as a highly efficient hydrogen oxidation electrocatalyst

Ge Meng et al.

Summary: A highly efficient WC/WO2-WO3 nanosheet heterostructure catalyst with excellent CO tolerance was synthesized via electrochemical reconstruction, significantly enhancing HOR performance and facilitating proton transfer and hydrogen oxidation. The in situ formed WO3 plays a key role in accelerating H-2 adsorption and activation on WC, hydrogen oxidation through HxWO3 phase formation, and H+ desorption from WO2-WO3, leading to greatly enhanced HOR performance with facilitated electron transfer by metallic WO2 and an in situ formed nanosheet structure.

JOURNAL OF MATERIALS CHEMISTRY A (2022)

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Article Chemistry, Multidisciplinary

The Sensitivity of Metal Oxide Electrocatalysis to Bulk Hydrogen Intercalation: Hydrogen Evolution on Tungsten Oxide

Evan Miu et al.

Summary: In this study, the critical influence of hydrogen intercalation on the activity of tungsten trioxide in the hydrogen evolution reaction is demonstrated using experimental and computational methods. Unlike previous heterogeneous catalysis research focusing on surface processes, this study reveals the crucial role of bulk oxide modification in the experimental hydrogen evolution activity.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Physical

Coupling structural evolution and oxygen-redox electrochemistry in layered transition metal oxides

Donggun Eum et al.

Summary: This study explores the close interplay between the local structural change and oxygen electrochemistry during short- and long-term battery operation for layered transition metal oxides (TMOs). The evolution of oxygen-redox activity and reversibility is found to be closely related to cation-migration mechanisms.

NATURE MATERIALS (2022)

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Article Chemistry, Physical

Lattice-Matching Formed Mesoporous Transition Metal Oxide Heterostructures Advance Water Splitting by Active Fe-O-Cu Bridges

Feng Hu et al.

Summary: This study reports a simple method to synthesize efficient bifunctional electrocatalysts that exhibit high catalytic activity and stability in alkaline oxygen/hydrogen evolution reactions. The catalysts have been designed and fabricated with an optimized structure and nanoporous morphology, resulting in low overpotential and high current density.

ADVANCED ENERGY MATERIALS (2022)

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Article Nanoscience & Nanotechnology

Interface engineering of metallic nickel nanoparticles/semiconductive nickel molybdate nanowires for efficiently electrocatalytic water splitting

B. Geng et al.

Summary: In this study, a heterojunction structure of metallic nickel nanoparticles/semiconductive nickel molybdate nanowires was constructed for overall water splitting. The experimental results showed significantly enhanced activities for hydrogen and oxygen evolution reactions due to the heterojunction effect. Density functional theory calculations demonstrated the improved electrical conductivity and optimized adsorption energies of hydrogen and water, resulting in low overpotentials and high current densities in alkaline electrolyte. This heterojunction-based material showed promising potential for water electrolysis.

MATERIALS TODAY NANO (2022)

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Article Chemistry, Multidisciplinary

Strategies for Designing High-Performance Hydrogen Evolution Reaction Electrocatalysts at Large Current Densities above 1000 mA cm-2

Mengtian Jin et al.

Summary: This article investigates the crucial issues of electrocatalysts working at high current densities, summarizes several strategies for designing high-performance HER electrocatalysts, and discusses the future challenges and opportunities for the development of HER catalysts.

ACS NANO (2022)

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Article Chemistry, Multidisciplinary

Directing the Architecture of Surface-Clean Cu2O for CO Electroreduction

Jiawei Liu et al.

Summary: A surfactant-free synthesis method was developed to regulate the morphology of Cu2O nanocrystals for enhanced electrocatalytic performance in CO conversion to n-propanol. Through a combination of concentration depletion effect and oxidation etching process, a Cu2O branching cubic framework was successfully fabricated, showing high n-propanol current density and Faradaic efficiency.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Review Chemistry, Physical

Surface Reconstruction of Water Splitting Electrocatalysts

Ye Zeng et al.

Summary: This article reviews recent progress in regulation strategies for reconstruction reactions in water electrolysis, including the mechanism of water electrolysis, critical factors of the reconstruction process, advanced characterization methods, and modulation strategies. The article highlights the effectiveness of regulating the reconstruction process to enhance catalytic performance of electrocatalysts, and discusses future challenges in surface-reconstructed catalysts for water electrolysis.

ADVANCED ENERGY MATERIALS (2022)

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Article Chemistry, Physical

Optimized Metal Deficiency-Induced Operando Phase Transformation Enhances Charge Polarization Promoting Hydrogen Evolution Reaction br

Ashutosh Kumar Singh et al.

Summary: In this study, the crystal structure and electronic properties of nickel were tuned by introducing tin metal and undergoing operando structural transformation. This enhanced the efficiency of hydrogen evolution during electrochemical water reduction.

CHEMISTRY OF MATERIALS (2022)

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Article Chemistry, Physical

Fe7Se8@Fe2O3 heterostructure nanosheets as bifunctional electrocatalyst for urea electrolysis

Jiaxin Li et al.

Summary: This paper presents a new method for exploring novel and environmentally friendly bifunctional electrocatalysts for urea electrolysis by synthesizing a bifunctional electrocatalyst with heterostructure. The synthesized catalyst exhibits excellent catalytic activity for urea electrolysis, achieving high current density with low potential requirement.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Multidisciplinary Sciences

Reversible hydrogen spillover in Ru-WO3-x enhances hydrogen evolution activity in neutral pH water splitting

Jiadong Chen et al.

Summary: In this study, the integration of Ru nanoparticles on oxygen-deficient WO3-x was found to greatly enhance the activity of hydrogen evolution reaction. Oxygen-deficient WO3-x has a large capacity for storing protons, which increases the hydrogen coverage on the surface of Ru nanoparticles.

NATURE COMMUNICATIONS (2022)

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Article Nanoscience & Nanotechnology

Inner Co Synergizing Outer Ru Supported on Carbon Nanotubes for Efficient pH-Universal Hydrogen Evolution Catalysis

Jian Chen et al.

Summary: In this study, a highly active and durable multicomponent catalyst for the hydrogen evolution reaction (HER) was developed. The catalyst, consisting of cobalt nanoparticles confined inside bamboo-like carbon nanotubes (CNTs) and ultralow ruthenium loading on the exterior walls, exhibited exceptional HER activity. The atomic-scale structural investigations and theoretical calculations revealed that the confined inner cobalt and loaded outer ruthenium induced charge redistribution and synergistic electron coupling, optimizing the adsorption energy of H intermediates and facilitating electron/mass transfer. The results demonstrated that the Co@CNTs | Ru catalyst achieved top-level catalytic activity among all reported HER catalysts. This work provides new insights for the rational design of carbon-supported metal catalysts for practical applications.

NANO-MICRO LETTERS (2022)

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Review Chemistry, Applied

Current trending and beyond for solar-driven water splitting reaction on WO3 photoanodes

Magno B. Costa et al.

Summary: This review highlights the importance of WO3 as a photoanode for light-driven water splitting and discusses recent strategies to improve its photoelectroactivity. By comparing photocurrent density and catalyst stability, it was found that the best results were achieved when using a heterojunction with desired morphology and crystal plane of the WO3 photoanode.

JOURNAL OF ENERGY CHEMISTRY (2022)

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Article Chemistry, Applied

Tailoring interfacial electron redistribution of Ni/Fe3O4 electrocatalysts for superior overall water splitting

Wenli Xu et al.

Summary: In this study, a strategy of electron redistribution by introducing Ni sites onto the surface of Fe3O4 is proposed to improve its activity as a bifunctional catalyst. The results demonstrate that the Ni/Fe3O4 catalyst with introduced Ni sites exhibits remarkable bifunctional activity and stability in water dissociation.

JOURNAL OF ENERGY CHEMISTRY (2022)

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Article Chemistry, Physical

Controllable transition engineering from homogeneous NiSe2 nanowrinkles to heterogeneous Ni3Se4/NiSe2 rod-like nanoarrays for promoted urea-rich water oxidation at large current densities

Xiujuan Xu et al.

Summary: By tuning the selenization temperature, we successfully achieved the controllable transition from homogeneous NiSe2 nanowrinkles to heterogeneous Ni3Se4/NiSe2 nanorods. The unique rod-like nanoarray architecture can greatly improve the mass transport efficiency.

APPLIED CATALYSIS B-ENVIRONMENTAL (2022)

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Article Engineering, Environmental

Boosting urea-assisted water splitting by constructing sphere-flower-like NiSe2-NiMoO4 heterostructure

Tianqi Yu et al.

Summary: This study successfully prepared a self-supported sphereflower-like NiSe2-NiMoO4 heterostructure catalyst on nickel foam, showing excellent performance for urea-assisted water splitting, providing a new approach for designing efficient bifunctional catalysts.

CHEMICAL ENGINEERING JOURNAL (2022)

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Review Materials Science, Multidisciplinary

Recent progress on the long-term stability of hydrogen evolution reaction electrocatalysts

Wenfang Zhai et al.

Summary: Developing new methodologies for producing clean and renewable energy is crucial for carbon-neutral initiatives. This review focuses on the long-term stability of hydrogen evolution reaction (HER) electrocatalysts and summarizes the research progress in this area. Challenges and future perspectives are also discussed.

INFOMAT (2022)

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Article Chemistry, Multidisciplinary

Methane plasma-mediated phase engineering of Ni nanosheets for alkaline hydrogen evolution

Wenxiu Yan et al.

Summary: This study successfully synthesized nickel nanocatalysts with different crystal structures through room-temperature plasma conversion, and found that hcp Ni nanocatalysts exhibited a lower overpotential for electrocatalytic hydrogen evolution reaction in alkaline solution.

NANOSCALE (2022)

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Article Chemistry, Applied

Sea urchin-like NiMoO4 nanorod arrays as highly efficient bifunctional catalysts for electrocatalytic/photovoltage-driven urea electrolysis

Chenxin Chen et al.

Summary: Sea urchin-like NiMoO4 nanorod arrays demonstrate efficient catalytic activity and stability for urea oxidation and hydrogen evolution. The difference in electrocatalytic activity and selectivity is attributed to the variation in lattice oxygen content. This material shows great potential for energy conversion.

CHINESE JOURNAL OF CATALYSIS (2022)

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Review Nanoscience & Nanotechnology

Designing Self-Supported Electrocatalysts for Electrochemical Water Splitting: Surface/Interface Engineering toward Enhanced Electrocatalytic Performance

Peican Wang et al.

Summary: Electrochemical water splitting is considered the most promising method for storing renewable electricity in the form of hydrogen fuel, but challenges remain with the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Surface and interface engineering offer a viable approach to enhance catalytic activity, with self-supported electrocatalysts showing high efficiency due to regulated interfaces. The review highlights the state-of-the-art achievements in self-supported electrocatalysts for HER/OER and proposes surface/interface engineering strategies to improve performance, identifying key approaches such as defect engineering and heterostructure design.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Review Chemistry, Multidisciplinary

Clean and Affordable Hydrogen Fuel from Alkaline Water Splitting: Past, Recent Progress, and Future Prospects

Zi-You Yu et al.

Summary: The hydrogen economy has emerged as a promising alternative to the current hydrocarbon economy, involving the use of renewable energy to split water into hydrogen and oxygen for further utilization as clean fuel. Among various water electrolysis technologies, alkaline water splitting has been commercialized for over 100 years and is considered the most mature and economic option. Advanced nonprecious metal electrocatalysts have shown potential for improving the efficiency and stability of alkaline water splitting processes, with a focus on catalyst synthesis and performance improvement.

ADVANCED MATERIALS (2021)

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Review Chemistry, Physical

Progress and Perspectives in Photo- and Electrochemical-Oxidation of Biomass for Sustainable Chemicals and Hydrogen Production

Hui Luo et al.

Summary: Biomass is a recognized ideal resource substitute for fossil fuels, with oxidation derivatives from biomass-derived compounds being used in the production of biodegradable polymers and pharmaceuticals. Combining biomass oxidation with hydrogen generation reactions presents a promising strategy for coproducing high value chemicals and hydrogen.

ADVANCED ENERGY MATERIALS (2021)

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Article Energy & Fuels

Nickel ferrocyanide as a high-performance urea oxidation electrocatalyst

Shi-Kui Geng et al.

Summary: Researchers have found that the nickel ferrocyanide catalyst can drive the urea oxidation reaction with higher activity and stability. Moreover, the catalyst appears to operate via a different pathway, which facilitates the efficiency of ammonia production.

NATURE ENERGY (2021)

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Review Chemistry, Multidisciplinary

Advanced hydrogen evolution electrocatalysts promising sustainable hydrogen and chlor-alkali co-production

Lu-Nan Zhang et al.

Summary: This review discusses the importance of advanced hydrogen evolution reaction (HER) electrocatalysts in the cost-effective and environmentally-benign co-production of hydrogen and chlor-alkali. It focuses on the design and fabrication of HER electrocatalysts with high activity and stability under the harsh conditions of chlor-alkali electrolysis, as well as the relationship between their structure and electrolytic properties. Moreover, the latest progress in the technology and engineering of the co-production process is also highlighted.

ENERGY & ENVIRONMENTAL SCIENCE (2021)

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Article Multidisciplinary Sciences