Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (05): 1219-1224.doi: 10.3866/PKU.WHXB20100507

• ELECTROCHEMISTRY • Previous Articles     Next Articles

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

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