Guided cracking of electrodes by stretching prism-patterned membrane electrode assemblies for high-performance fuel cells

被引：59

作者：

Ahn, Chi-Yeong ^{[1
,2
]}

Jang, Segeun ^{[3
,4
]}

Cho, Yong-Hun ^{[5
]}

Choi, Jiwoo ^{[3
,4
]}

Kim, Sungjun ^{[1
,2
]}

Kim, Sang Moon ^{[6
]}

Sung, Yung-Eun ^{[1
,2
]}

Choi, Mansoo ^{[3
,4
]}

机构：

[1] Inst for Basic Sci Korea, Ctr Nanoparticle Res, Seoul 08826, South Korea

[2] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 08826, South Korea

[3] Seoul Natl Univ, Global Frontier Ctr Multiscale Energy Syst, Seoul 08826, South Korea

[4] Seoul Natl Univ, Dept Mech & Aerosp Engn, Seoul 08826, South Korea

[5] Kangwon Natl Univ, Dept Chem Engn, Samcheok 25913, South Korea

[6] Incheon Natl Univ, Dept Mech Engn, Incheon 22012, South Korea

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

基金：

新加坡国家研究基金会;

关键词：

CATHODE CATALYST LAYER; PORE-FORMER;

D O I：

10.1038/s41598-018-19861-6

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：

Guided cracks were successfully generated in an electrode using the concentrated surface stress of a prism-patterned Nafion membrane. An electrode with guided cracks was formed by stretching the catalyst-coated Nafion membrane. The morphological features of the stretched membrane electrode assembly (MEA) were investigated with respect to variation in the prism pattern dimension (prism pitches of 20 mu m and 50 mu m) and applied strain (S approximate to 0.5 and 1.0). The behaviour of water on the surface of the cracked electrode was examined using environmental scanning electron microscopy. Guided cracks in the electrode layer were shown to be efficient water reservoirs and liquid water passages. The MEAs with and without guided cracks were incorporated into fuel cells, and electrochemical measurements were conducted. As expected, all MEAs with guided cracks exhibited better performance than conventional MEAs, mainly because of the improved water transport.

引用

页数：9

共 34 条

[1] Pillar Structured Membranes for Suppressing Cathodic Concentration Overvoltage in PEMFCs at Elevated Temperature/Low Relative Humidity [J].