【摘要】 分别在酸性和碱性电解质中研究了界面合金化的纳米Ag承载Pt纳米结构催化剂Pt0.5^Ag-B/C(Pt/Ag原子比为0.5)对氧还原反应(ORR)的电催化特点.结果表明,该催化剂对ORR的半波电势(E1/2)与通常的Pt/C催化剂(E-TEK公司)相当,但前者的本征电催化活性是后者的近两倍.与未合金化的Pt0.5^Ag-A/C相比,在Pt0.5^Ag-B/C催化剂中形成的合金化的Pt/Ag界面不仅使ORR的E1/2正移,而且明显提高了贵金属Pt的分散度或利用率.更多还原

【Abstract】 An interfacially alloyed Pt-on-Ag nanostructure(Pt0.5^Ag-B/C) was loaded on Vulcan XC-72 carbon to make a cathode Pt0.5^Ag-B/C catalyst for the oxygen reduction reaction(ORR).The electrocatalytic performance of this Pt0.5^Ag-B/C catalyst was measured by reference to its unalloyed counterpart Pt0.5^Ag-A/C and E-TEK Pt/C catalysts.The intrinsic activity of Pt in the Pt0.5^Ag-B/C catalyst was identified to be twice that in the E-TEK Pt/C catalyst although the half-wave potentials(E1/2) of the ORR curves over both catalysts were the same.Compared with the unalloyed Pt0.5^Ag-A/C catalyst, the alloying at the Pt/Ag interface in the Pt0.5^Ag-B/C catalyst gave a more positive E1/2 and also a significantly higher mass-specific activity of Pt for ORR.更多还原