4.8 Article

Geometrically Deformed Iron-Based Single-Atom Catalysts for High-Performance Acidic Proton Exchange Membrane Fuel Cells

Related references

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

Cation-Vacancy-Enriched Nickel Phosphide for Efficient Electrosynthesis of Hydrogen Peroxides

Zheng Zhou et al.

Summary: Electrocatalytic hydrogen peroxide synthesis via two-electron oxygen reduction reaction pathway is becoming increasingly important due to its green production process. Introducing cationic vacancies on nickel phosphide as a proof-of-concept to regulate the catalyst's properties has led to efficient H2O2 electrosynthesis. The created Ni cationic vacancies enriched Ni2-xP-V-Ni electrocatalyst exhibits remarkable 2e ORR performance and long-term durability, with optimized geometric and electronic structures. Cation vacancy engineering is believed to be an effective strategy for creating active heterogeneous catalysts with atomic precision.

ADVANCED MATERIALS (2022)

Article Engineering, Environmental

Metal-organic framework assembly derived hierarchically ordered porous carbon for oxygen reduction in both alkaline and acidic media

Bowen Liu et al.

Summary: A series of ZIF-8 assemblies were fabricated to synthesize PNC-30 catalyst, which exhibited half-wave potentials of 0.90 and 0.76 V in alkaline and acidic electrolytes, respectively. PNC-30 showed 1.6 times higher power density in zinc-air batteries compared to commercial Pt/C.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Chemistry, Physical

Fe Single-Atom Catalysts on MOF-5 Derived Carbon for Efficient Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cells

Xiaoying Xie et al.

Summary: The development of Fe single-atom catalysts using MOF-5 as a precursor has led to the creation of highly-porous carbon with an ultrahigh specific surface area, resulting in improved performance in proton exchange membrane fuel cells for the oxygen reduction reaction. The Fe SAC-MOF-5 catalyst demonstrated excellent half-wave potential and peak power density due to the high density of single Fe atoms and increased exposure of active sites on the external surface area of the carbon support.

ADVANCED ENERGY MATERIALS (2022)

Review Chemistry, Multidisciplinary

Insight into Structural Evolution, Active Sites, and Stability of Heterogeneous Electrocatalysts

Shenlong Zhao et al.

Summary: Studying the structure-activity correlations of electrocatalysts is crucial for improving the conversion of electrical to chemical energy. Recent evidence obtained through operando characterization techniques shows that the structural evolution of catalysts, caused by their interaction with electric fields, electrolytes, and reactants/intermediates, leads to the formation of real active sites. It is therefore important to summarize the research advances in structural evolution and envision future developments. In this Minireview, the fundamental concepts associated with structural evolution, the triggers of this evolution, and advanced operando characterizations are discussed. The reversibility of structural evolution in heterogeneous electrocatalysis, with a focus on the oxygen evolution and CO2 reduction reactions, is also highlighted. Finally, the key challenges and opportunities in this exciting field are presented.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

Article Chemistry, Physical

Site-density engineering of single-atomic iron catalysts for high-performance proton exchange membrane fuel cells

Feng Liu et al.

Summary: A novel polydopamine-metal complex-assisted pyrolysis strategy was used to produce catalysts with hierarchically porous carbon support and highly exposed dense-FeN4 sites, leading to significantly enhanced performance for oxygen reduction reaction (ORR) and superior power densities in proton exchange membrane fuel cells (PEMFCs). The quantitative relationship between the active site activity and ORR performance was established, highlighting the dominating role of FeN4 site density in the observed excellent PEMFC performance. This work provides a useful guidance for the design and development of novel highly-efficient single-atomic catalysts for renewable energy applications.

APPLIED CATALYSIS B-ENVIRONMENTAL (2022)

Article Chemistry, Physical

Large-scale production of holey carbon nanosheets implanted with atomically dispersed Fe sites for boosting oxygen reduction electrocatalysis

Xuanni Lin et al.

Summary: This study presents a simple and environmentally friendly mechanochemical method to synthesize zeolitic imidazolate frameworks precursors for the production of atomically dispersed Fe-N-4 sites on a large scale. The resulting thin porous carbon nanosheets with abundant active sites exhibit superior catalytic activity towards oxygen reduction reaction, providing a promising approach for cost-effective production of atomically dispersed transition metal catalysts at a large scale for practical applications.

NANO RESEARCH (2022)

Article Chemistry, Physical

Regulating electron transfer over asymmetric low-spin Co(II) for highly selective electrocatalysis

Kuang-Hsu Wu et al.

Summary: Modulating the steric-electronic configuration of metal-organic centers is key for tuning the activity and selectivity of heterogeneous reactions. In this study, three different asymmetric metal-organic complexes with unique steric-electronic structures are immobilized on nanocarbon for an electron-transfer-controlled oxygen reduction reaction. The results show that acidic diamine ligands facilitate a four-electron transfer, while basic ligands drive a highly selective two-electron route, regulated by the ligand's proton transfer ability.

CHEM CATALYSIS (2022)

Article Chemistry, Physical

A template-free method to synthesis high density iron single atoms anchored on carbon nanotubes for high temperature polymer electrolyte membrane fuel cells

Yi Cheng et al.

Summary: The study developed a simple and template-free method to prepare high-density iron single atoms supported CNTs, which exhibited comparable performance to precious metal platinum for ORR and high phosphate resistance, making it suitable for high-temperature polymer electrolyte membrane fuel cells.

NANO ENERGY (2021)

Article Chemistry, Multidisciplinary

Atomically Dispersed Co2-N6 and Fe-N4 Costructures Boost Oxygen Reduction Reaction in Both Alkaline and Acidic Media

Zhe Wang et al.

Summary: Researchers have developed a new ternary-atom catalyst with Co-Co dimers and Fe single sites, demonstrating superior performance in ORR. By controlling the local configuration of atoms, researchers have enhanced the performance of the catalyst, making it a promising alternative to platinum for driving zinc-air batteries.

ADVANCED MATERIALS (2021)

Article Chemistry, Physical

Identification of durable and non-durable FeNx sites in Fe-N-C materials for proton exchange membrane fuel cells

Jingkun Li et al.

Summary: Fe-N-C materials show promise as an alternative to platinum in acidic polymer fuel cells, but limited understanding of their operando degradation hinders rational approaches to improved durability. Two distinct FeNx sites in the catalysts degrade differently during the oxygen reduction reaction, with one site substantially contributing after 50 hours of operation.

NATURE CATALYSIS (2021)

Article Chemistry, Multidisciplinary

Resolving the Dilemma of Fe-N-C Catalysts by the Selective Synthesis of Tetrapyrrolic Active Sites via an Imprinting Strategy

Davide Menga et al.

Summary: By identifying a paradigm shift in the synthesis of Fe-N-C catalysts and applying fundamental principles, it was possible to overcome the dilemma of low active site densities. Through successive low- and high-temperature ion exchange reactions, a high loading of atomically dispersed Fe was achieved, resulting in a phase-pure catalyst entirely composed of tetrapyrrolic Fe-N-4 sites. The density of these sites was significantly higher than previously reported, showcasing a promising advancement in single-site fuel cell catalysts.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

Article Chemistry, Multidisciplinary

Highly Accessible Atomically Dispersed Fe-Nx Sites Electrocatalyst for Proton-Exchange Membrane Fuel Cell

Jianing Guo et al.

Summary: The study introduces a facile method for synthesizing atomically dispersed Fe-N-x species on hierarchically porous carbon nanostructures as an efficient and stable catalyst for oxygen reduction in acidic media for proton exchange membrane fuel cells. The designed hierarchical pore structure facilitates mass transport and utilization of active sites, leading to higher power density in devices.

ADVANCED SCIENCE (2021)

Article Multidisciplinary Sciences

Substrate strain tunes operando geometric distortion and oxygen reduction activity of CuN2C2 single-atom sites

Guokang Han et al.

Summary: The rational design of single-atom catalysts is challenging. This work reveals a substrate-strain tuned geometry distortion of CuN2C2 single-atom site, which greatly boosts oxygen reduction activity by facilitating electron transfer to adsorbed O.

NATURE COMMUNICATIONS (2021)

Article Chemistry, Multidisciplinary

Fe-N-C Electrocatalysts with Densely Accessible Fe-N4 Sites for Efficient Oxygen Reduction Reaction

Yazhou Zhou et al.

Summary: This study demonstrates an in situ trapping strategy using nitrogen-rich molecules to enhance the amount of accessible Fe-N-4 sites in Fe-N-C electrocatalysts, leading to improved ORR activity.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

Compressive Strain Modulation of Single Iron Sites on Helical Carbon Support Boosts Electrocatalytic Oxygen Reduction

Jia Yang et al.

Summary: The study demonstrates that strain engineering of curved single atomic iron-nitrogen sites can significantly enhance electrocatalytic activity. The introduction of high-curvature surface with compressive strain on Fe-N-4 sites leads to downshifted d-band center, reducing the bonding strength between oxygenated intermediates and metal sites, resulting in a lower energy barrier for oxygen reduction. Catalytic tests show a 31-fold increase in kinetic current density for curved Fe-N-4 sites compared to planar ones in alkaline media.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Physical

Chemical vapour deposition of Fe-N-C oxygen reduction catalysts with full utilization of dense Fe-N4 sites

Li Jiao et al.

Summary: Replacing scarce and expensive platinum with metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction in proton exchange membrane fuel cells has been impeded by the low active site density and site utilization of M-N-C. These limitations have now been overcome by implementing trans-metalation of Zn-N-4 sites into Fe-N-4 sites.

NATURE MATERIALS (2021)

Article Chemistry, Multidisciplinary

Simultaneously Engineering the Coordination Environment and Pore Architecture of Metal-Organic Framework-Derived Single-Atomic Iron Catalysts for Ultraefficient Oxygen Reduction

Feng Liu et al.

Summary: By synergizing single iron active centers with local S atoms in metal-organic frameworks, this study has significantly enhanced the oxygen reduction reaction performance, leading to improved catalytic activity and battery performance.

SMALL (2021)

Article Energy & Fuels

High-performing commercial Fe-N-C cathode electrocatalyst for anion-exchange membrane fuel cells

Horie Adabi et al.

Summary: This study presents a high-performing commercial oxygen reduction catalyst that can replace platinum group metal catalysts, resulting in improved performance and reduced cost for anion-exchange membrane fuel cells.

NATURE ENERGY (2021)

Article Chemistry, Multidisciplinary

Nano-geometric deformation and synergistic Co nanoparticles-Co-N4 composite sites for proton exchange membrane fuel cells

Xiaoyang Cheng et al.

Summary: A novel strategy was developed to enhance the ORR activity of Co single-atom catalysts by introducing a deformed CoN4 site and Co nanoparticle-CoN4 composite sites, which effectively replenished the total density of CoN4. The resulting concave nanocube-like catalyst exhibited excellent ORR performance and high power density in acidic media, with theoretical studies confirming the enhanced O-2 activation and reduced carbon layer erosion. This research not only provides a new approach to develop ORR catalysts, but also contributes to a deeper understanding of ORR fundamentals.

ENERGY & ENVIRONMENTAL SCIENCE (2021)

Article Chemistry, Multidisciplinary

Single-Atom Iron Catalysts on Overhang-Eave Carbon Cages for High-Performance Oxygen Reduction Reaction

Chun-Chao Hou et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

Review Chemistry, Physical

Iron-Nitrogen-Carbon Catalysts for Proton Exchange Membrane Fuel Cells

Tristan Asset et al.

JOULE (2020)

Article Multidisciplinary Sciences

A pyrolysis-free path toward superiorly catalytic nitrogen-coordinated single atom

Peng Peng et al.

SCIENCE ADVANCES (2019)

Article Nanoscience & Nanotechnology

Insight into the Rapid Degradation Behavior of Nonprecious Metal Fe-N-C Electrocatalyst-Based Proton Exchange Membrane Fuel Cells

Junren Chen et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

Article Chemistry, Multidisciplinary

Thermally Driven Structure and Performance Evolution of Atomically Dispersed FeN4 Sites for Oxygen Reduction

Jiazhan Li et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

Review Chemistry, Multidisciplinary

Progress in the Development of Fe-Based PGM-Free Electrocatalysts for the Oxygen Reduction Reaction

Ulises Martinez et al.

ADVANCED MATERIALS (2019)

Review Chemistry, Multidisciplinary

PGM-Free Cathode Catalysts for PEM Fuel Cells: A Mini-Review on Stability Challenges

Yuyan Shao et al.

ADVANCED MATERIALS (2019)

Article Chemistry, Physical

Hierarchically porous metal-free carbon with record high mass activity for oxygen reduction and Zn-air batteries

Yuanhui Cheng et al.

JOURNAL OF MATERIALS CHEMISTRY A (2019)

Article Chemistry, Multidisciplinary

The Solid-Phase Synthesis of an Fe-N-C Electrocatalyst for High-Power Proton-Exchange Membrane Fuel Cells

Qingtao Liu et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2018)

Article Multidisciplinary Sciences

Unveiling the high-activity origin of single-atom iron catalysts for oxygen reduction reaction

Liu Yang et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2018)

Article Chemistry, Physical

Single-atom cobalt electrocatalysts for foldable solid-state Zn-air battery

Liu Yang et al.

NANO ENERGY (2018)

Review Multidisciplinary Sciences

Combining theory and experiment in electrocatalysis: Insights into materials design

Zhi Wei Seh et al.

SCIENCE (2017)

Article Multidisciplinary Sciences

In situ electrochemical quantification of active sites in Fe-N/C non-precious metal catalysts

Daniel Malko et al.

NATURE COMMUNICATIONS (2016)

Article Chemistry, Physical

Opening of Bottleneck Pores for the Improvement of Nitrogen Doped Carbon Electrocatalysts

Jonas Pampel et al.

ADVANCED ENERGY MATERIALS (2016)

Article Chemistry, Multidisciplinary

Stability of Fe-N-C Catalysts in Acidic Medium Studied by Operando Spectroscopy

Chang Hyuck Choi et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2015)

Article Multidisciplinary Sciences

Quantifying the density and utilization of active sites in non-precious metal oxygen electroreduction catalysts

Nastaran Ranjbar Sahraie et al.

NATURE COMMUNICATIONS (2015)

Article Chemistry, Physical

Degradation of Fe/N/C catalysts upon high polarization in acid medium

Vincent Goellner et al.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2014)