Degradation behaviors of polymer electrolyte membrane fuel cell under freeze/thaw cycles |
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Authors: | Maji Luo Chengyong Huang Wei Liu Zhiping Luo Mu Pan |
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Affiliation: | 1. School of Automobile Engineering, Wuhan University of Technology, Wuhan 430070, PR China;2. State Key Laboratory of Advanced Technology for Materials Synthesis & Processing, Wuhan University of Technology, Wuhan 430070, PR China |
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Abstract: | Degradation behaviors of polymer electrolyte membrane fuel cell (PEMFC) in high current density region were investigated under Freeze/Thaw cycles. Different dehumidification scenarios namely hot purge, cold purge and no purge were adopted for comparison. Micrographs from scanning electron microscopy proved little change in catalyst-coated membrane (CCM) integrity, no delamination or segregation occurred after many freeze/thaw cycles. Cyclic Voltammetry (CV) measurement revealed reduction in electrochemical active surface area of CCM. The observed performance decay in the high current density region was mainly attributed to the increased interface contact resistance and degraded electric and gas coupling characteristics at interfaces between CCM and GDL in this paper. Meanwhile, the performance degradation under low current densities (for example 400 mA cm−2 or even lower) was mainly ascribed to the degraded characteristics of catalyst layers referring to CCM as cyclic voltammetry indicated. Proper dehumidification through gas purging is effective to maintain stable preference under subzero temperature. |
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Keywords: | Freezing/thaw Performance decay High current density Performance degradation Polymer electrolyte membrane fuel cell (PEMFC) |
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