通过合金和去合金过程制备一种海绵状的纳米多孔铂以及对氧的电催化还原

采用一种简易的方法制备了海绵状的球形纳米多孔铂，首先是用循环伏安法在玻碳电极上电沉积得到铂铜合金，然后在浓硝酸中刻蚀合金去掉铜．用到场发射扫描电镜、X射线光电子能谱、X射线衍射和循环伏安法对其进行了表征．也对制备此种铂催化剂的条件进行了优化．此种铂修饰电极对氧的还原表现出很高的电催化活性，其氧的还原峰电流是相应纳米铂修饰电极的四倍．这种制备海绵状纳米多孔结构的方法以及所得到得到铂修饰电极可能在燃料电池和生物传感器等领域有着很大的应用前景．

Fabrication of sponge-like nanoporous platinum electrocatalysts for oxygen reduction through alloying and dealloying processes

A novel sponge-like spherical nanoporous platinum (N-Ps-Pt) was generated through a facileway of electrodeposition followed by chemical etching at room temperature. First, a Pt-Cu alloynanoparticles was electrodeposited on a glassy carbon electrode (GCE) using cyclic voltammetry (CV),and then Cu was etched off from the alloy in HNO3. FE-SEM, XPS, XRD and CV were used forcharacterization. Optimal conditions for the preparation were investigated. The NPs-Pt modifiedelectrode (N-Ps-Pt/GCE) exhibited excellent electrocatalytic activity toward the oxygen reduction reaction(ORR). Moreover, the peak current of ORR at NPs-Pt/GCE was 4 times higher than thecorrespondingly prepared Pt nanopartides modified electrode, showing much higher current sensitivity.The preparation method for the sponge-like nanoporous structure and the NPs-Pt modifiedelectrode can be expected to have promising applications in the field of fuel cells and biosensors.