Experimental analysis of platinum utilization in a DMFC cathode
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An experimental analysis of platinum utilization in a DMFC cathode is performed. The chief objective of this work is to elucidate the effect of Nafion and polytetrafluoroethylene (PTFE) on platinum utilization values on the cathode. Polarization curves indicate that the performance of a DMFC is sensitive to the Carbon/Nafion (C/N) and Nafion:PTFE (N/P) ratio in the catalyst layer. Our analysis shows that supported Pt/C catalysts have a much higher platinum utilization value than unsupported catalysts. Platinum utilization is a maximum at a C/N ratio of 2.5 and at a N/P ratio of six. Platinum utilization is more sensitive to the Nafion content in the catalyst layer than the Teflon content.
KeywordsNafion Teflon Cyclic voltammetry DMFC Platinum utilization
The author would like to thank the Director, ARCI, Hyderabad and DST, Government of India for financial assistance and ARCI for a fellowship to S. Deepalochani and support for this work. The author would also like to thank the Director, CFCT, Chennai, where the work was done. Further, the author would like to thank Dr. Ramya Krishnan for useful discussions and help with graphs.
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