Study on the performance of a proton exchange membrane fuel cell related to the structure design of a gas diffusion layer substrate |
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Authors: | Junhyun Cho Hwanyeong Oh Jaeman Park Kyoungdoug Min Eunsook Lee Jy-Young Jyoung |
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Affiliation: | 1. Energy Efficiency Department, Korea Institute of Energy Research, 152 Gajeong-Ro, Yuseong-Gu, Daejeon 305-343, Republic of Korea;2. School of Mechanical and Aerospace Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-Gu, Seoul 151-744, Republic of Korea;3. JNTG, #235-36 Mannyun-ro, Jeongnam-myeon, Hwasung-si, Gyeonggi-Do 445-961, Republic of Korea |
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Abstract: | Although characteristics of the gas diffusion layer (GDL) affect the performance of a proton exchange membrane fuel cell (PEMFC), mass transfer mechanisms inside the GDL and the performance of the PEMFC have not been directly correlated. To determine the design parameters of the GDL, the effects of substrate design of the GDL on performance of a PEMFC are investigated. By adding an active carbon fiber (ACF), which has a high surface area, the substrate is designed to have a different pore size structure. The results show that steady-state and transient responses are determined by capillary pressure gradient characteristics of the GDL made by pore size distribution of the substrate. The small macro-pore functions as water-retaining passage and the large macro-pore functions as water-removal passage. It is concluded that both small and large macro-pore must be present on the substrate to facilitate its function in a wide range of operating conditions. |
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Keywords: | Proton exchange membrane fuel cell Gas diffusion layer Substrate Transient response Capillary pressure gradient Macro-pore |
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