| Summary: | 碩士 === 國立臺北科技大學 === 化學工程系碩士班 === 92 === The direct methanol fuel cell（DMFC）using a polymer electrolyte membrane isa promising candidate for the application in portable power sources,electric vehicle and transportation because it does not require any fuel processing equipment. However,the main challenge for the development of DMFC is to reduce the noble metal catalyst loading of the electrodes and the associated cost without decreasing
the efficiency of the fuel cell. Some papers concern the electrodeposition of bimetallic systems by pulses,but to our knowledge, few paper deal with Pt-Ru deposition. In addition, the main goal of this study is to show that nanostructured Pt-Ru bimetallic anodes can be prepared using the technique of metal electrodeposition by dual-potential pulses.
The first part of the thesis is to carry out the potential analysis of Platinum and Ruthenium by cyclic voltammetry.A reducing peak on potential 0.65V vs Ag/AgCl is found, and the chemical reaction of platinum and Ruthenium deposition are PtCl62-＋4e- → Pt＋6e-、RuCl52-＋3e- →Ru＋5Cl- .The second part,the electrodeposition of Platinum and Ruthenium was carried out on Carbon cloth to prepare the DMFC’s anode by dual-potential pulse.A pulsed potential in a potential region of -0.25V to 0.65V vs Ag/AgCl is applied to the electrodeposition solution, the total charges are controlled under 4 C/cm2. Different time ratios（tup=1s,tup/tlow=0.1-1）were used compare with active area.The third part, the optimal frequency parameters were searched by the on-off time ratio and the concentrations of precursors.
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