中文摘要：

以无定形硒溶胶为模板制备了不同硒覆盖度（θSe）（θSe=0.49,0.39,0.06,0）的Pt-Se和Pt纳米空球（分别记为（Pt-Se）HN和PtHN）,发展了利用亚硫酸盐彻底除去核壳纳米粒子上Se的方法.对获得的纳米空球进行了形貌和结构的表征,结果表明所制备的（Pt-Se）HN粒径均匀,分散性好,球壳呈多孔结构.以其作为电催化剂制备了（Pt-Se）HN修饰的玻碳（GC）电极（（Pt-Se）HN/GC）,利用常规电化学方法比较该电极与PtHN/GC和商用碳载铂（Pt/C）修饰GC（Pt/C/GC）电极对甲酸的催化氧化作用,发现对甲酸氧化的活性顺序为（Pt-Se）HN/GC〉PtHN/GC〉Pt/C/GC.三种电极催化甲酸氧化的机理有所不同：前者更倾向于通过弱吸附中间体直接氧化成CO2的单途径机理进行,后两者则通过强吸附和弱吸附中间体的双途径机理进行.在一定Se覆盖度条件下,（Pt-Se）HN/GC对甲酸的氧化有助催化作用.

英文摘要：

Platinum-selenium and platinum hollow nanospheres（denoted as（Pt-Se）HN and PtHN,respectively） with different coverages of Se（θSe）（θSe=0.49,0.39,0.06,0） were prepared using amorphous Se colloids as a sacrificial template.Sulfite was used to completely remove Se from the core-shell nanoparticles.The morphology and structure of the nanoparticles were characterized using various methods,which revealed a hollow structure with a very uniform size distribution and a porous structure on the shell.Assembly of Pt-Se hollow nanospheres（（Pt-Se）HN） on a glassy carbon（GC） electrode produced a（Pt-Se）HN/GC electrode.The electrocatalytic activity of the electrode for the oxidation of formic acid was compared with the PtHN/GC and commercial Pt/C/GC electrodes by cyclic voltammetry and chronoamperometry.The activity followed the order：（Pt-Se）HN/GC PtHN/GC Pt/C/GC.The electrooxidation of formic acid on（Pt-Se）HN/C,PtHN/C,and Pt/C catalysts follows different mechanisms：the former tends to directly oxidize formic acid to CO2 via weakly adsorbed intermediates,and the latter two via both weakly and strongly adsorbed intermediates.（Pt-Se）HN with a suitable selenium content showed optimal electrocatalytic activity for the oxidation of formic acid.