Study on the processes of start-up and shutdown in proton exchange membrane fuel cells |
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Authors: | Qiang Shen Ming Hou Dong Liang Zhimin Zhou Xiaojin Li Zhigang Shao Baolian Yi |
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Affiliation: | 1. Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road, Dalian 116023, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Several different start-up and shutdown processes of a fuel cell were investigated in this paper by measuring cathode, anode and membrane potentials respectively versus reference hydrogen electrode (RHE). The membrane potential was measured by using thin copper wire sandwiched between two membranes. During the formation of hydrogen/air boundary at the anode caused by unprotected start-up and shutdown, the in-plane potential difference between membrane inlet and outlet was measured to be as high as 0.8 V, and the interfacial potential difference between cathode and membrane outlet increased to about 1.6 V, which in turn would cause carbon corrosion. Appropriate start-up and shutdown processes were suggested to avoid the formation of hydrogen/air boundary. |
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Keywords: | Proton exchange membrane fuel cell Start-up Shutdown Hydrogen/air boundary Carbon corrosion |
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