Ordered CoPt oxygen reduction catalyst with high performance and durability

被引:27
|
作者
Pan, Yung-Tin [1 ,5 ]
Li, Dongguo [1 ]
Sharma, Shubham [2 ]
Wang, Chenyu [1 ]
Zachman, Michael J. [3 ]
Wegener, Evan C. [4 ]
Kropf, A. Jeremy [4 ]
Kim, Yu Seung [1 ]
Myers, Deborah J. [4 ]
Peterson, Andrew A. [2 ]
Cullen, David A. [3 ]
Spendelow, Jacob S. [1 ]
机构
[1] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA
[2] Brown Univ, Sch Engn, Providence, RI 02912 USA
[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, POB 2009, Oak Ridge, TN 37831 USA
[4] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA
[5] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 300044, Taiwan
来源
CHEM CATALYSIS | 2022年 / 2卷 / 12期
关键词
FUEL-CELL PERFORMANCE; CATHODE CATALYSTS; ALLOY; DIFFUSION;
D O I
10.1016/j.checat.2022.10.030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A high-performance and durable polymer electrolyte membrane fuel cell cathode catalyst composed of an ordered L1(0)-CoPt core and a thin Pt shell was designed and prepared. Under practical fuel cell membrane electrode assembly testing conditions, the cathode catalyst showed an outstanding initial mass activity of 0.6 A/mg(Pt), which satisfies the U.S. Department of Energy performance target while also meeting the durability target of less than 40% loss in mass activity after 30,000 accelerated stress test voltage cycles. The high structural stability of the L1(0)-CoPt@Pt-shell catalyst was confirmed by postmortem materials characterization, and the origin of this robustness was revealed by density functional theory calculations, where the barriers for diffusion of Co atoms were observed to be significantly increased in the ordered intermetallic core.
引用
收藏
页码:3559 / 3572
页数:14
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