Enhancing Oxygen Reduction Activity of Pt‐based Electrocatalysts: From Theoretical Mechanisms to Practical Methods

Pt‐based electrocatalysts are considered as one of the most promising choices to facilitate the oxygen reduction reaction (ORR), and the key factor enabling their success is to reduce the required amount of platinum. Herein, we focus on illuminating both the theoretical mechanisms which enable enhan...

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Veröffentlicht in:Angewandte Chemie (International ed.) Jg. 59; H. 42; S. 18334 - 18348
Hauptverfasser: Ma, Zhong, Cano, Zachary P., Yu, Aiping, Chen, Zhongwei, Jiang, Gaopeng, Fu, Xiaogang, Yang, Lin, Wu, Tianpin, Bai, Zhengyu, Lu, Jun
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Germany Wiley Subscription Services, Inc 12.10.2020
Wiley
Ausgabe:International ed. in English
Schlagworte:
Catalysts
Chemical reduction
electrocatalysis
Electrocatalysts
Electronic structure
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Intermediates
Oxygen
oxygen reduction reaction
Oxygen reduction reactions
PEMFC
Platinum
practical methods
proton exchange membrane fuel cell
Pt-based electrocatalysts
Reaction intermediates
Shape control
Size reduction
theoretical mechanisms
PEMFC
platinum
oxygen reduction reaction
electrocatalysis
ISSN:1433-7851, 1521-3773, 1521-3773
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Zusammenfassung:Pt‐based electrocatalysts are considered as one of the most promising choices to facilitate the oxygen reduction reaction (ORR), and the key factor enabling their success is to reduce the required amount of platinum. Herein, we focus on illuminating both the theoretical mechanisms which enable enhanced and sustained ORR activity and the practical methods to achieve them in catalysts. The various multi‐step pathways of ORR are firstly reviewed and the rate‐determining steps based on the reaction intermediates and their binding energies are analyzed. We then explain the critical aspects of Pt‐based electrocatalysts to tune oxygen reduction properties from the viewpoints of active sites exposure and altering the surface electronic structure, and further summarize representative research progress towards practically achieving these activity enhancements with a focus on platinum size reduction, shape control and core Pt elimination methods. We finally outline the remaining challenges and provide our perspectives with regard to further enhancing their activities. Pt‐based electrocatalysts: This Minireview illuminates both the theoretical mechanisms from the viewpoints of active sites exposure and altering the surface electronic structure, which enable enhanced and sustained ORR activity, and the practical methods to achieve them in catalysts, with a focus on size reduction, shape control and core elimination methods.
Bibliographie:These authors contributed equally to this work.
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Natural Sciences and Engineering Research Council of Canada (NSERC)
National Natural Science Foundation of China (NSFC)
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
AC02-06CH11357; 51922008; 51872075; D17007; GZS2018003
Henan Center for Outstanding Overseas Scientists
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202003654