电化学置换法制备高Pt利用率的类核壳型Ni-Pt电催化剂(英文)  

Galvanic Replacement Strategy for a Core-Shell Like Ni-Pt Electrocatalyst with High Pt Utilization

作　　者：孙盾[1] 何建平[1] 周建华[1] 王涛[1] 狄志勇[1] 丁晓春[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《物理化学学报》2010年第5期1219-1224,共6页Acta Physico-Chimica Sinica

基　　金：supported by the National Natural Science Foundation(50871053);Aeronautical Science Foundation of China(2007ZF52061)~~

摘　　要：采用电化学置换法,在VulcanXC-72表面制备得到了活性高和分散性好的纳米Ptshell-Nicore电催化剂.该方法先以NaH2PO2为还原剂,化学沉积得到Ni核,Pt在Ni核表面通过原位置换形成Ni-Pt类核壳型结构.通过透射电镜(TEM)、X射线衍射(XRD)、紫外-可见光光谱(UV-Vis)和循环伏安(CV)测试证明了Pt壳层完全包覆在Ni核的表面.电化学氢吸/脱附测试结果显示,Ptshell-Nicore/XC-72的电化学活性面积为Pt/C(JM)的1.2倍,而其理论Pt担载量只为Pt/C(JM)的40%.这表明,核壳型Ni-Pt纳米粒子可以显著提高Pt的催化活性和利用率.A highly active and well-dispersed nanoscale Ptshell-Nicore/XC-72 electrocatalyst was synthesized.The Nicore was reduced by NaH2PO2,followed by an in situ galvanic replacement to yield a Ni-Pt core-shell like structure.Complete coverage of the Ni core by a Pt shell was confirmed by various techniques including transmission electron microscopy（TEM）,X-ray diffraction（XRD）,UV-visible（UV-Vis） spectrophotometry,and cyclic voltammetry（CV）.A probe reaction of hydrogen electrooxidation showed that the electrocatalytically active surface area of Ptshell-Nicore/XC72 is 1.2 times as large as that of Pt/C（JM）,even though its theoretical Pt loading is only 40% that of Pt/C（JM）.This improvement in activity is attributed to the interaction between the Pt shell and the Ni core.

关 键 词：电催化剂 Ptshell-Nicore/XC-72 类核壳结构 Pt利用率 

分 类 号：O643.36[理学—物理化学]