Hard-Magnet L10-CoPt Nanoparticles Advance Fuel Cell Catalysis

被引：432

作者：

Li, Junrui ^{[1
]}

Sharma, Shubham ^{[2
]}

Liu, Xiaoming ^{[3
]}

Pan, Yung-Tin ^{[4
]}

Spendelow, Jacob S. ^{[4
]}

Chi, Miaofang ^{[3
]}

Jia, Yukai ^{[5
]}

Zhang, Peng ^{[5
]}

Cullen, David A. ^{[6
]}

Xi, Zheng ^{[1
]}

Lin, Honghong ^{[1
]}

Yin, Zhouyang ^{[1
]}

Shen, Bo ^{[1
]}

Muzzio, Michelle ^{[1
]}

Yu, Chao ^{[1
]}

Kim, Yu Seung ^{[4
]}

Peterson, Andrew A. ^{[2
]}

More, Karren L. ^{[3
]}

Zhu, Huiyuan ^{[7
]}

Sun, Shouheng ^{[1
]}

机构：

[1] Brown Univ, Dept Chem, Providence, RI 02912 USA

[2] Brown Univ, Sch Engn, Providence, RI 02912 USA

[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci Div, Oak Ridge, TN 37831 USA

[4] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA

[5] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4R2, Canada

[6] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[7] Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN 37831 USA

来源：

JOULE | 2019年 / 3卷 / 01期

基金：

美国国家科学基金会;

关键词：

OXYGEN REDUCTION; ALLOY NANOPARTICLES; FEPT NANOPARTICLES; NANOWIRES; STRAIN; COPT;

D O I：

10.1016/j.joule.2018.09.016

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：

Stabilizing transition metals (M) in MPt alloy under acidic conditions is challenging, yet crucial to boost Pt catalysis toward oxygen reduction reaction (ORR). We synthesized similar to 9 nm hard-magnet core/shell L1(0)-CoPt/Pt nanoparticles with 2-3 atomic layers of strained Pt shell for ORR. At 60 degrees C in acid, the hard-magnet L1(0)-CoPt better stabilizes Co (5% loss after 24 hr) than soft-magnet A1-CoPt (34% loss in 7 hr). L1(0)-CoPt/Pt achievesmass activities (MA) of 0.56 A/mg(Pt) initially and 0.45 A/mg(Pt) after 30,000 voltage cycles in the membrane electrode assembly at 80 degrees C, exceeding the DOE 2020 targets on Pt activity and durability (0.44 A/mg(Pt) in MA and < 40% loss in MA after 30,000 cycles). Density functional theory calculations suggest that the ligand effect of Co and the biaxial strain (-4.50%/-4.25%) of the Pt shell weaken the binding of oxygenated species, leading to enhanced ORR performance in fuel cells.

引用

页码：124 / 135

页数：12

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