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

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Title
Guided cracking of electrodes by stretching prism-patterned membrane electrode assemblies for high-performance fuel cells
Author(s)
Chi-Yeong Ahn; Segeun Jang; Yong-Hun Cho; Jiwoo Choi; Sungjun Kim; Sang Moon Kim; Yung-Eun Sung; Mansoo Choi
Publication Date
2018-01
Journal
SCIENTIFIC REPORTS, v.8, no.1, pp.1257 -
Publisher
NATURE PUBLISHING GROUP
Abstract
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 μm and 50 μm) and applied strain (S ≈ 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. © 2018 The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/4714
ISSN
2045-2322
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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