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Development of a porosity-graded micro porous layer using thermal expandable graphite for proton exchange membrane fuel cells

Authors
Chun, Jeong HwanJo, Dong HyunKim, Sang GonPark, Sun HeeLee, Chang HoonLee, Eun SookJyoung, Jy-YoungKim, Sung Hyun
Issue Date
10월-2013
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Proton exchange membrane fuel cell (PEMFC); Gas diffusion layer (GDL); Micro porous layer (MPL); Graded porosity; Thermal expandable graphite (TEG)
Citation
RENEWABLE ENERGY, v.58, pp.28 - 33
Indexed
SCIE
SCOPUS
Journal Title
RENEWABLE ENERGY
Volume
58
Start Page
28
End Page
33
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/102015
DOI
10.1016/j.renene.2013.02.025
ISSN
0960-1481
Abstract
In this study, a porosity-graded micro porous layer (MPL) was prepared using the double coating method to enhance the water removal ability of the gas diffusion layer (GDL). In the double MPL, the porosity of each layer was controlled using thermal expandable graphite (TEG), which could produce pores in MPL through thermal expansibility. The porosity of the inner layer of the porosity-graded MPL was smaller than the outer layer, so the gradient direction in porosity was from the MPL/catalyst layer interface to the gas diffusion backing layer (GDBL)/MPL interface. In addition, the pore forming ability of TEG and the water removal ability of porosity-graded MPL were characterized. The performance of the porosity-graded MPL was evaluated and compared to the single layer conventional MPL The porosity-gradient structure in MPL increased the water permeability of GDL and the performance of the single cell in the high current density region. Since the porosity-graded MPL increased the water removal ability of GDL, concentration loss due to water flooding in the high current density region was decreased. These results demonstrate that porosity-graded MPL was beneficial to PEMFC, which has to operate in the high current density region. (C) 2013 Elsevier Ltd. All rights reserved.
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