立方体形Au_(core)-Pd_(shell)-Pt_(cluster)纳米材料对甲酸电催化的研究  

Electrocatalytic Oxidation of HCOOH at Au_(core)-Pd_(shell)-Pt_(cluster) Nanocubes

作　　者：江庆宁[1] 李幻[1] 杨凝[1] 方萍萍[1] 范凤茹[1] 田中群[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室,化学化工学院化学系,福建厦门361005

出　　处：《电化学》2010年第2期125-130,共6页Journal of Electrochemistry

基　　金：国家重点基础研究发展规划973项目(2007CB815303)资助

摘　　要：应用晶种生长法制得金纳米立方体,Aucore-Pdshell和Aucore-Pdshell-Ptcluster电催化剂,通过改变溶液的H2PdCl4和H2PtCl6的用量以控制Pdshell的厚度和Ptcluster的覆盖度.采用扫描电镜(SEM)、透射电镜(TEM)观察了金纳米立方体的表面结构.利用循环伏安法(CV)研究了不同Pd层厚度的立方体形Aucore-Pdshell纳米粒子和不同Pt岛覆盖度的立方体形Aucore-Pdshell-Ptcluster纳米粒子对甲酸氧化的电催化性能.结果表明,与立方体形Aucore-Pdshell纳米粒子相比,"核-壳-岛"结构的立方体形Aucore-Pdshell-Ptcluster纳米粒子对甲酸的电氧化具有更高活性.当Pd壳层厚度为3层,Pt岛覆盖度为0.5时,电催化活性最高.Gold nanocubes were synthesized by a two-step seed-mediated growth method. The Aucore-Pdshell and Aucore-Pdshell-Ptcluster nanocubes with controllable shell thickness of Pd and cluster coverage of Pt were synthesized by simply changing the amount ratio of H2PdCl4 or H2PtCl6. The samples were characterized by scanning electron microscope （ SEM） 、transmission electron microscopc （ TEM） and cyclic voltammetry （ CV） . CV was then used to make a systematic study on the dependence of the electrocatalytic properties on the shell thickness of Aucore-Pdshell and Pt coverage of Aucore-Pdshell-Ptcluster,respectively. The results indicated that the Au nanocube core coated by three atomic layers of Pd and submonolayer of Pt exhibited extremely high catalytic activity for electrooxidation of formic acid.

关 键 词：金纳米立方体 金核-钯壳-铂岛纳米粒子 甲酸 电催化 

分 类 号：O646.54[理学—物理化学]