Au@Pt纳米粒子催化O_2还原反应的电化学研究  

Electrochemical Study of Au@Pt Nanoparticles for Oxygen Reduction Reaction

作　　者：邓小聪[1] 田向东[2] 温飞鹏[1] 易飞[1] 程美琴[1] 钟起玲[1] 颜佳伟[2] 任斌[2] 田中群[2] 

机构地区：[1]江西师范大学化学化工学院,南昌330022 [2]厦门大学化学化工学院化学系,固体表面物理化学国家重点实验室,厦门361005

出　　处：《高等学校化学学报》2012年第2期336-340,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20663002);厦门大学固体表面物理化学国家重点实验室基金(批准号:200907)资助

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.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.

关 键 词：Au@Pt纳米粒子 电催化 O2还原 耐甲醇性 

分 类 号：O646[理学—物理化学]