Optimization of GDLs for high-performance PEMFC employing stainless steel bipolar plates

Title
Optimization of GDLs for high-performance PEMFC employing stainless steel bipolar plates
Authors
엄광섭조은애장종현김형준임태훈Bo Ki HongJong Hyun Lee
Keywords
Proton exchange membrane fuel cells; Stainless-steel bipolar plate; Gas diffusion layer; Polytetraflouroethylene; Operating conditions
Issue Date
2013-05
Publisher
International journal of hydrogen energy
Citation
VOL 38, NO 14, 6249-6260
Abstract
The effects of polytetraflouroethylene (PTFE) content in the gas diffusion layer (GDL) on the performance of PEMFCs with stainless-steel bipolar plates are studied under various operation conditions, including relative humidity, cell temperature, and gas pressure. The optimal PTFE content in the GDL strongly depends on the cell temperature and gas pressure. Under unpressurized conditions, the best cell performance was obtained by the GDL without PTFE, at a cell temperature of 65 °C and relative humidity (RH) of 100%. However, under the conditions of high cell temperature (80 °C), low RH (25%) and no applied gas pressure, which is more desirable for fuel cell vehicle (FCV) applications, the GDL with 30 wt.% PTFE shows the best performance. The GDL with 30 wt.% PTFE impedes the removal of produced water and increases the actual humidity within the membrane electrode assembly (MEA). A gas pressure of 1 bar in the cell using the GDL with 30 wt.% PTFE greatly improves the performance, especially at low RH, resulting in performance that exceeds that of the cell under no gas pressure and high RH of 100%.
URI
http://pubs.kist.re.kr/handle/201004/44770
ISSN
03603199
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KIST Publication > Article
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