电化学还原制备铂-氢钨青铜阳极

用电化学还原法在炭布上电沉积铂-氢钨青铜复合催化剂作为质子交换膜燃料电池(PEMFC)阳极。 利用X射线衍射、扫描电子显微镜、单电池极化性能测试以及电化学阻抗谱(EIS)法研究了催化剂的组成、分散性及其对氢氧化的电催化性能。 实验结果表明，阴极还原顺序对催化剂的形貌及分散有较大的影响。 采用分步还原法制备的HxWO3/Pt电极(先沉积铂，后沉积氢钨青铜)对氢氧化具有较高的催化活性，氢钨青铜与铂形成协同催化效应，提高了铂对氢氧化的催化活性。 而共沉积制备的Pt-HxWO3催化剂的电催化活性较差，这是因为共沉积过程中，由于受到2种电解液共存的影响，电极催化层中没有或较少得到氢钨青铜，且铂催化剂出现明显的团聚现象。

Preparation of Platinum-hydrogen Tungsten Bronze Anodes by Electrochemical Reduction

Anodes of proton exchange membrane fuel cell with the platinum-hydrogen tungsten bronze(HxWO3) as the composite catalysts were prepared by electrochemical reduction on carbon cloth.The catalysts were characterized by XRD,SEM,EIS and single-cell polarization tests.The results showed that the order of electrochemical reduction had a major impact on the morphology and dispersion of the catalysts.The composite catalyst of HxWO3/Pt exhibited synergistic catalytic effect and increased the catalytic activity for h...