Abstract:
The efficiency of catalytic electrode of the proton exchange membrane fuel cell depends on the characteristic of electrode such as thickness, resistance, catalyst and electrode preparation, etc. The catalyst has a good characteristic when residence time in the step of hydrogen reducing is increased. In this work, the higher efficiency of catalyst is prepared in hydrogen reducing step at 250℃ for 4 hours and at 350℃ for 1 hour and used carbon Gigantic supporter. To understand the electrode mechanism, we have to study the characteristic of electrode prepared by painting and electrodeposition methods on carbon paper supporter. The result shows that the thickness of catalyst layer from the painting method was 20-80 micron and the electrode resistant was 50-250 mohm/cm². The thickness increase with the increasing of composition of catalyst layer. For the electrodeposition method, the thickness of electrode didnt change and the resistant was 50-300 mohm/cm². The good dispersion of catalyst was found in these 2 methods. The efficiency of catalytic electrode increase when the quantity of catalytic increase. At the same quantity of catalyst, the efficiency of electrode can be categorized as Pt/C < Pt-Ru/C > Pt-Co/C > Pt-Ni/C. The electrode prepared by electrodeposition method has a lower efficiency than that by painting method.