Subsize Pt-based intermetallic compound enables long-term cyclic mass activity for fuel-cell reduction

被引：133

作者：

Cheng, Han ^{[1
]}

Gui, Renjie ^{[1
]}

Yu, Hao ^{[2
]}

Wang, Chun ^{[1
]}

Liu, Si ^{[1
]}

Liu, Hongfei ^{[1
]}

Zhou, Tianpei ^{[1
]}

Zhang, Nan ^{[3
]}

Zheng, Xusheng ^{[3
]}

Chu, Wangsheng ^{[3
]}

Lin, Yue ^{[1
]}

Wu, HengAn ^{[2
]}

Wu, Changzheng ^{[1
,4
]}

Xie, Yi ^{[1
,4
]}

机构：

[1] Univ Sci & Technol China, CAS Ctr Excellence Nanosci, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

[2] Univ Sci & Technol China, CAS Ctr Excellence Complex Syst Mech, CAS Key Lab Mech Behav & Design Mat, Dept Modern Mech, Hefei 230027, Peoples R China

[3] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

[4] Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230026, Peoples R China

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2021年 / 118卷 / 35期

基金：

中国博士后科学基金;

关键词：

subsize Pt-based intermetallic; cyclic mass activity; fuel cells; oxygen reduction reaction; OXYGEN REDUCTION; ALLOY NANOPARTICLES; FEPT NANOPARTICLES; CATHODE CATALYST; PARTICLE-SIZE; PLATINUM; DURABILITY; OXIDES; PHASE;

D O I：

10.1073/pnas.2104026118

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

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 ultra thin 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 sub size 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.

引用

页数：8

共 45 条

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