Microscopic insights on the degradation of a PEM water electrolyzer with ultra-low catalyst loading

被引：104

作者：

Yu, Haoran ^{[1
,2
]}

Bonville, Leonard ^{[2
]}

Jankovic, Jasna ^{[2
,3
]}

Maric, Radenka ^{[1
,2
,3
]}

机构：

[1] Univ Connecticut, Dept Chem & Biomol Engn, 191 Auditorium Rd,Unit 3222, Storrs, CT 06269 USA

[2] Univ Connecticut, Ctr Clean Energy Engn, 44 Weaver Rd,Unit 5233, Storrs, CT 06269 USA

[3] Univ Connecticut, Dept Mat Sci & Engn, 97 North Eagleville Rd, Storrs, CT 06269 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2020年 / 260卷

关键词：

Proton exchange membrane water electrolysis; Membrane electrode assembly; Stability; Degradation; OXYGEN EVOLUTION ACTIVITY; ENERGY CARRIER; MEMBRANE; STABILITY; IRIDIUM; HYDROGEN; PERFORMANCE; DISSOLUTION; FUEL; ELECTROCATALYSTS;

D O I：

10.1016/j.apcatb.2019.118194

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：

The present work aims for a comprehensive understanding of the degradation of proton exchange membrane water electrolyzer (PEMWE) with a low catalyst loading of 0.3 mg cm(-2) Pt and 0.08 mg cm(-2) Ir after a long-term test of 4500 h at 1.8 A cm(-2). For the first time, the mechanism of cathode degradation is proposed using established physical models from two aspects: (1) Pt dissolution from nanoparticles and (2) Pt dissolution due to rapid Pt oxide reduction at the start of operation. As Ir dissolves and migrates through the membrane, Pt-Ir precipitates are formed in the membrane. Furthermore, iridium dissolution and subsequent re-deposition on the cathode constitute a major portion (42%) of the anode catalyst loss. The overall picture of degradation mechanisms and the distribution of platinum and iridium across the membrane electrode assembly (MEA) are provided.

引用

页数：13

共 47 条

[1] Pathways to ultra-low platinum group metal catalyst loading in proton exchange membrane electrolyzers [J].