P_2O_5-SiO_2-PMA系ガラスを電解質にしたH_2/O_2燃料電池の低温動作特性

概要

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Heteropolyacid containing phosphosilicate glasses were prepared by the sol-gel technique and were studied in relation to their structural, thermal, and textural properties. These glasses are mechanically, thermally, chemically stable and have proton conductivity. It was found to be a suitable potential electrolyte for H_2/O_2 fuel cells. The average pore size of up to 3nm was observed from a N_2 adsorption-desorption analysis. The electrical conductivity was measured under humidity and temperature conditions. The glasses showed the proton conductivity values in the order of 10^<-3>-10^<-2> S cm^<-1>, especially, 9.8×10^<-2> S cm^<-1> at 90℃ and 70% RH. The cell performance is mainly determined by the higher conductivity characteristics of the electrolyte. We have successfully achieved a high power density value of 17.2mW/cm^2 using P_2O_5-SiO_2-PMA (7-89-4mol%) glasses as an electrolyte and 0.1mg/cm^2 of Pt/C loaded on the electrode at 30℃ and RH 30%.
社団法人日本セラミックス協会の論文
2006-09-01