| The direct liquid fuel cell has wide application in the portable equipment, electric car and field power and so on. Due to the low-pollution, abundant sources, high energy efficiency, the easy storage and transportation of the fuel, they were paid much attention and investigated widely. However, the key issues which hinder the commercial application of fuel cell are the low electrochemical activity and high cost of the electrocatalyst. Therefore, the improvement of the electrocatalytic activity of the electrocatalysts and the decrease of the loading mass of noble metals are the effective routes for the commercial application of fuel cells. In this paper, the assistant catalysts, new structure of classical catalysts and new catalyst support in fuel cells have been investigated, we prepared HPA/Pt/PAMAM composite film. The micrographs structure and catalytic properties of the the composite film have been investigated by X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope (SEM), Energy Disperse Spectroscopy (EDS), Atomic Force Microscopy (AFM) and Cyclic Voltammetry (CV) and chronoamperometry method.Electrochemical method, such as cyclic voltammetry and timing current methods were used respectively to prepare Pt on the surface of glassy carbon. The preparation for different morphology platinum catalyst nanoparticle is practical, the dispersivity of platinum catalyst nanoparticle is good, forming a uniform film on the modified glassy carbon electrode, and showing good electrochemical catalytic activity. PAMAM dendrimer is used as template for the fabrication of Pt nanoparticles. The surfaces were smooth and were dispersed with uniform spherical particles. Otherwise, H3[PMo12O40] and H3 [PW12O40] are cheaper good proton conductor, and has been reported as redox mediators for CO electro-oxidation, thus it could be suitable for decreasing the poisoning effect of CO. H3[PMo12O40] and H3[PW12O40] can improve the electro-catalytic activity of Pt catalyst. |
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