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Geometric reconstruction and numerical analysis for characterization of transport properties at various levels of water saturation in micro/nano structure of catalyst layers

Title
Geometric reconstruction and numerical analysis for characterization of transport properties at various levels of water saturation in micro/nano structure of catalyst layers
Author
이성철
Keywords
Micro/nano structure; Catalyst layer; Water imbibition; Reconstruction; Model
Issue Date
2017-09
Publisher
KOREAN ASSOC CRYSTAL GROWTH
Citation
JOURNAL OF CERAMIC PROCESSING RESEARCH, v. 18, no. 9, page. 666-670
Abstract
Water transport across membrane-electrode assemblies is one of the key factors in determining the performance of proton-exchange membrane fuel cells (PEMFCs). In particular, the water saturation in the catalyst layers (CLs) is significantly related to the gas transport to the reaction sites and the ionic conductivity decided by water activity. Herein, to investigate the effect of CL structure on water transport, we compare the transport properties at various water saturation levels of two CLs, namely conventional CL and nanosized dense-structured (NSDS) CL. The two CLs were three-dimensionally reconstructed using focused ion beam-scanning electron microscopy tomography. Subsequently, the structural and transport properties were calculated based on the reconstructed CLs. The results show that the smaller pore size of the NSDS CL led to lower water permeability (a high water-retaining property) and lower saturation (water-flooding prevention). Thus, this provides insight into how the CLs could be used in the water management of PEMFCs to improve their performance.
URI
https://www.kci.go.kr/kciportal/ci/sereArticleSearch/ciSereArtiView.kci?sereArticleSearchBean.artiId=ART002325737http://repository.hanyang.ac.kr/handle/20.500.11754/115616
ISSN
1229-9162
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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