Abstract
A method to prepare improved Pt-based catalyst for direct methanol fuel cell is described in this study. Silane coupling agents (3-aminopropyl) trimethoxysilane (APTMS) (3-glycidyloxy propyl) trimethoxysilane, and N-[3(trimethoxysilyl) propyl] ethylenediamine (3-glycidyloxy) were used to graft perfluorosulfonic ionomer on Pt to stabilize the dispersion and therefore to obtain an electrode with fine Pt cluster and high catalyst utilization. From extended X-ray absorption fine structure examination, Pt nano-particle can be successfully confined to smaller size with the help of APTMS. Polarization test shows improved membrane electrode assembly (MEA) performance while using APTMS. From hydrogen adsorption/desorption cyclic voltammotric analysis, about 15% catalyst utilization increase can be achieved.
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