Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 95-101.doi: 10.3866/PKU.WHXB201209272

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Characterization of Core-Shell Co@Pt/C Catalysts for Fuel Cell

CAO Chun-Hui1,2, LIN Rui1,2, ZHAO Tian-Tian1,2, HUANG Zhen1,2, MA Jian-Xin1,2   

  1. 1 Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, P. R. China;
    2 School of Automotive Studies, Tongji University, Shanghai 201804, P. R. China
  • Received:2012-07-11 Revised:2012-09-26 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21276199), Program for Young Excellent Talents in Tongji University, China (2006KJ022), Shanghai Leading Academic Discipline Project, China (B303), and Energy Saving and Environmental Protection Automobile Innovation“111 Project”(B08019).

Abstract:

Co@Pt/C core-shell catalysts have been synthesized by a two-step chemical reduction method, followed by heat treatment in a H2 and N2 mixture. High resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS) techniques were used to characterize the catalyst microstructure and morphology. The results indicate that the core-shell structure of Co rich in core and Pt rich in shell is formed and the nano-particles are highly dispersed on the surface of the carbon support. Heat treatment affects the structure and morphology of the catalysts. The electrocatalytic performance, kinetic characteristics of O2 reduction reaction (ORR), and durability of the catalysts were measured by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) techniques. It was found that the formation of the core-shell structure is favorable for improving the performance and utilization of Pt. The Co@Pt/C catalyst mechanism proceeds by an approximately four-electron pathway in acid solution, through which molecular oxygen is directly reduced to water. Compared with alloy catalysts, the formation of the core-shell structure obviously improves the catalyst durability.

Key words: Fuel cell, Core-shell structure Co@Pt/C catalyst, Electrochemical performance, Reaction kinetic, Durability

MSC2000: 

  • O643