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|標題:||Suppressing the methanol crossover for DMFC by double layers of nanometer-sized Pt-Ru/Pt-dispersed in PEM||作者:||Wan, C.H.
|關鍵字:||methanol crossover;nanometer-sized Pt-Ru/Pt particles;filtering;effect;impregnation-reduction method;DMFC;platinum-ruthenium;anodic-oxidation;fuel-cells;membrane;performance;proton;water||Project:||Journal of the Chinese Society of Mechanical Engineers||期刊/報告no：:||Journal of the Chinese Society of Mechanical Engineers, Volume 28, Issue 4, Page(s) 421-427.||摘要:||
A novel PEM structure, comprising double layers of nanometer-sized Pt-Ru/Pt particles dispersed in PEM, is proposed to suppress the methanol crossover and improve the utilization efficiency of the methanol. This is believed to improve the reliability and performance of the DMFC. SEM, X-ray, EPMA and Auger electron analysis are used. to verify the microstructure, morphology, phases, layer thickness and the composition of the resulting metal particles in PEM. The concentration of CO2 at the cathode side is detected by CO2 sensor, and the results are used to determine the cross over rate of methanol. The results indicate that the. PEM with double layers of nanometer-sized Pt-Ru/Pt particles dispersed in PEM anode side can easily been prepared by appropriately controlling the IR process parameters, such as reaction temperature, reduction time and the amount of PEM swelling agent. This study demonstrates that the existence of double layers of nanometer-sized Pt-Ru/Pt particles dispersed in PEM anode side efficiently suppresses the. methanol. crossover up to 32%. The function of "filter" out the methanol in the PEM by the double layers of nanometer-sized Pt-Ru/Pt particles in PEM causes the suppression of methanol crossover.
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