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《Journal of Central South University(Science and Technology)》 2008-03
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Preparation and characterization of PtRuP/C catalysts

YANG Zhi-kuan1,2,WANG Yao-wu2,XIE Xiao-feng2,GUO Jian-wei2,HU Guo-rong1(1.School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China;2.Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)  
A 60% PtRuP/C anode electrocatalyst for a direct methanol fuel cell(DMFC) was prepared by impregnation method using sodium hypophosphite as reductive agent.Effects of pH values and element P on the catalyst activities were studied.The structure,component and morphology were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),energy dispersive X-ray spectroscopy(EDS) and X-ray photoelectron spectra(XPS).The electrocatalytic performances were examined by linear sweep voltammetry(LSV) and chronoamperometry.The results show that the structure and electrocatalytic properties are greatly influenced by the pH value of impregnating solution.The catalyst prepared at the pH value of 7 has high dispersion,the highest catalytic activity for methanol oxidation,good tolerance to poisoning species and the average particle size of 2.8 nm.Compared with the PtRu/C catalyst,the PtRuP/C catalyst possesses a higher catalytic activity producing current density of 63 mA/cm2 at 0.45 V(vs.SCE) with a scanning rate of 20 mV/s.
【Fund】: 国家“863”计划项目(2006AA05Z138 2007AA05Z146);; 国家自然科学基金资助项目(50573041)
【CateGory Index】: TM911.4
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