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Breakthrough/drainage pressures and X-ray water visualization in gas diffusion layer of PEMFC |
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| Authors: | Jongrok Kim |
| Affiliation: | a Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Namgu, Pohang, Kyoungbuk 790-784, Republic of Korea b The Korea Atomic Energy Research Institute, 150 Deokjin-dong, Yuseong-gu, Daejeon 305-353, Republic of Korea c Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125, USA, d School of Dynamic Systems, University of Cincinnati, Cincinnati, OH 45221, USA e Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Namgu, Pohang, Kyoungbuk 790-784, Republic of Korea |
| Abstract: | The primary role of the gas diffusion layers (GDLs) in polymer electrolyte membrane fuel cells (PEMFC) is to maintain the delicate balance between water retention and removal in GDLs. Water management in the fuel cell is related to the breakthrough pressure at which water starts to pass through GDL, and the drainage pressure, which is maintained after the breakthrough. These pressures are both related to water management in fuel cells. Here we measured these pressures for two different GDLs and used X-ray tomography to visualize the water distributions within them. We then relate the variations in liquid pressures to the visualization and discuss water management in PEMFC. |
| Keywords: | Break-through pressure Drainage pressure Gas diffusion layers Polymer electrolyte membrane fuel cell X-ray tomography |
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