中文摘要：

以100 nm的Au粒子为核,抗坏血酸为还原剂,H2PtCl6.6H2O为前驱体,合成了Pt包Au核壳结构纳米粒子（Au@Pt）及其修饰的玻碳（GC）电极（Au@Pt/GC）.采用旋转圆盘电极等常规电化学方法,比较了Au@Pt/GC和商用碳载铂（Pt/C）修饰的玻碳电极（Pt/C/GC）催化O2还原反应活性及耐甲醇性能,发现Au@Pt纳米粒子在铂用量很低的情况下,其催化O2还原反应活性仍与商用Pt/C相当,而且还具有优良的耐甲醇性能;其催化O2还原反应机理按O2直接还原成H2O的四电子历程进行.

英文摘要：

Core-shell nanostructure Au@Pt nanoparticles were synthesized with a diameter of 100 nm Au nanoparticles as cores,ascorbic acid as reducing agent and H2PtCl6·6H2O as the precursor.The synthesized nanoparticles and commercial electrocatalysts were dropped on glassy carbon electrodes（Au@Pt/GC） to form the oxygen reduction electrodes（Au@Pt/GC,Pt/C/GC）.The reaction activities for oxygen reduction and methanol tolerance of Au@Pt/GC and commercial Pt/C/GC electrodes were compared with those of rotating disk electrode and other conventional electrochemical methods.At a significantly reduced amount of Pt,the oxygen reduction activity of Au@Pt nanoparticles is still comparable with the commercial Pt/C.The oxygen reduction proceeds via a four-electron transfer reaction to water on Au@Pt nanoparticles.Futhermore,it shows a good tolerance to methanol.