物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1219-1224.doi: 10.3866/PKU.WHXB20100507

电化学 上一篇    下一篇

电化学置换法制备高Pt利用率的类核壳型Ni-Pt电催化剂

孙盾, 何建平, 周建华, 王涛, 狄志勇, 丁晓春   

  1. 南京航空航天大学材料科学与技术学院, 南京 210016
  • 收稿日期:2009-09-06 修回日期:2009-12-31 发布日期:2010-04-29
  • 通讯作者: 何建平 E-mail:jianph@nuaa.edu.cn

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

SUN Dun, HE Jian-Ping, ZHOU Jian-Hua, WANG Tao, DI Zhi-Yong, DING Xiao-Chun   

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautic, Nanjing 210016, P. R. China
  • Received:2009-09-06 Revised:2009-12-31 Published:2010-04-29
  • Contact: HE Jian-Ping E-mail:jianph@nuaa.edu.cn

摘要:

采用电化学置换法, 在Vulcan XC-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.

关键词: 电催化剂, Ptshell-Nicore/XC-72, 类核壳结构, Pt利用率

Abstract:

A highly active and well-dispersed nanoscale Ptshell-Nicore/XC-72 electrocatalyst was synthesized. The Ni-core 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/XC-72 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.

Key words: Electrocatalyst, Ptshell-Nicore/XC-72, Core-shell like structure, Pt utilization

MSC2000: 

  • O646