Kinetic investigations and product analysis for optimizing platinum loading in direct ethanol fuel cell (DEFC) electrodes
In this investigation, attempt has been taken to optimize Pt loading in chemically synthesized carbon-supported Pt catalyst for ethanol electro-oxidation. Surface morphology and structural characteristics showed that the catalyst matrix of 40% Pt/C is formed with homogeneously distributed and reduced particle size compared with the other catalysts. The electrochemical techniques were employed to investigate on the kinetics and mechanism of ethanol electro-oxidation at room temperature. The reaction intermediates formed during the electro-oxidation of ethanol was estimated by ion chromatography and the highest yield of acetate on 40% Pt/C substantiates the catalytic superiority of this electrode over the others. Finally, the catalytic performance of this electrode was compared with an electrodeposited electrode with much higher content of Pt, and it was summarized that the chemical method of deposition is much more effective than electroplating exhibiting high electrocatalytic activity towards ethanol oxidation.
The authors graciously acknowledge the financial support by the Department of Science and Technology (DST), New Delhi, India for the WOS-A scheme, offered to Susmita Singh. The authors would also like to appreciate the technical support on instrumental facilities given by the Ministry of Human Resource and development (MHRD), Govt. of India.
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