Analysis of operational characteristics of polymer electrolyte fuel cell with expanded graphite flow-field plates via electrochemical impedance investigation

被引：17

作者：

Park, Taehyun ^{[1
]}

Chang, Ikvvhang ^{[2
]}

Lee, Yoon Ho ^{[1
]}

Ji, Sanghoon ^{[2
]}

Cha, Suk Won ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Sch Mech & Aerosp Engn, Seoul 151744, South Korea

[2] Seoul Natl Univ, Grad Sch Convergence Sci & Technol, Suwon 443270, South Korea

来源：

ENERGY | 2014年 / 66卷

基金：

新加坡国家研究基金会;

关键词：

PEFC (Polymer electrolyte fuel cell); Expanded graphite; Flow-field plate; Single channel; EIS (Electrochemical impedance spectroscopy); BIPOLAR PLATES; COMPRESSION; PERFORMANCE; INJECTION; DESIGN; STACK;

D O I：

10.1016/j.energy.2013.11.051

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Expanded graphite was investigated as a material for flow-field plates in PEFCs (polymer electrolyte fuel cells). Because expanded graphite is flexible but has similar material properties with normal graphite, channels on flow-field plates were designed to have single channel in order to compare operational characteristics including diffusion of reactants through ribs by comparing polarization curves and electrochemical impedance spectra between PEFCs with expanded graphite and graphite flow-field plates. As a result, PEFC with the expanded graphite flow-field plates has comparable open-circuit voltage to that with the graphite flow-field plates. However, PEFC with the expanded graphite plates had higher ohmic resistance than that with the graphite plates due to higher electrical resistance of the expanded graphite than that of the graphite. It was also found from faradaic resistances that the diffusion of the reactants through GDIs (gas diffusion layers) is disturbed in the case of the expanded graphite flow-field plates because the GDL is compressed excessively due to its flexibility. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：77 / 81

页数：5

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