PEMFC Carbon Corrosion due to Start-Stop Cycling
Dynamic load cycling method is often used to simulate both dynamic driving load and start-stop cycle. However, utilisation of this method to simulate start-stop cycle is considered to be very conservative and moreover irrelevant to certain energy supplying system for electric vehicle where the Proton Exchange Membrane Fuel Cells (PEMFC) produces constant load and dynamic driving load is taken over by energy storage systems. Consequently, this research is conducted by focusing on the effect of start-stop cycle under various constant loads on PEMFC performance using electrochemical characterisation. The findings emphasise the carbon corrosion resulted from start-stop cycling as the major effect. In addition, it was found that the phenomena occurring due to start-stop cycling are competitive diffusion, water electrolysis, water electro-osmosis, and water back diffusion, as summarised in the matrix provided in this paper. According to the findings, it is finally recommended to operate PEMFC at high load in order to diminish the mass transfer resistance due to start-stop cycle.
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