气候变化领域集成服务门户(CCPortal): Subsize Pt-based intermetallic compound enables long-term cyclic mass activity for fuel-cell oxygen reduction

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DOI	10.1073/pnas.2104026118
	Subsize Pt-based intermetallic compound enables long-term cyclic mass activity for fuel-cell oxygen reduction
	Cheng H.; Gui R.; Yu H.; Wang C.; Liu S.; Liu H.; Zhou T.; Zhang N.; Zheng X.; Chu W.; Lin Y.; Wu H.; Wu C.; Xie Y.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:35
英文摘要	Pt-based alloy catalysts may promise considerable mass activity (MA) for oxygen reduction but are generally unsustainable over long-term cycles, particularly in practical proton exchange membrane fuel cells (PEMFCs). Herein, we report a series of Pt-based intermetallic compounds (Pt3Co, PtCo, and Pt3Ti) enclosed by ultrathin Pt skin with an average particle size down to about 2.3 nm, which deliver outstanding cyclic MA and durability for oxygen reduction. By breaking size limitation during ordered atomic transformation in Pt alloy systems, the MA and durability of subsize Pt-based intermetallic compounds can be simultaneously optimized. The subsize scale was also found to enhance the stability of the membrane electrode through preventing the poisoning of catalysts by ionomers in humid fuel-cell conditions. We anticipate that subsize Pt-based intermetallic compounds set a good example for the rational design of high-performance oxygen reduction electrocatalysts for PEMFCs. Furthermore, the prevention of ionomer poisoning was identified as the critical parameter for assembling robust commercial membrane electrodes in PEMFCs. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Cyclic mass activity; Fuel cells; Oxygen reduction reaction; Subsize Pt-based intermetallic
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238411
作者单位	Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, 230026, China; Department of Modern Mechanics, CAS Key Laboratory of Mechanical Behavior and Design of Materials, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei, 230027, China; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China; Institute of Energy, Hefei Comprehensive National Science Center, Hefei, 230026, China
推荐引用方式 GB/T 7714	Cheng H.,Gui R.,Yu H.,et al. Subsize Pt-based intermetallic compound enables long-term cyclic mass activity for fuel-cell oxygen reduction[J],2021,118(35).
APA	Cheng H..,Gui R..,Yu H..,Wang C..,Liu S..,...&Xie Y..(2021).Subsize Pt-based intermetallic compound enables long-term cyclic mass activity for fuel-cell oxygen reduction.Proceedings of the National Academy of Sciences of the United States of America,118(35).
MLA	Cheng H.,et al."Subsize Pt-based intermetallic compound enables long-term cyclic mass activity for fuel-cell oxygen reduction".Proceedings of the National Academy of Sciences of the United States of America 118.35(2021).