Citation: CAO Chun-Hui, LIN Rui, ZHAO Tian-Tian, HUANG Zhen, MA Jian-Xin. Preparation and Characterization of Core-Shell Co@Pt/C Catalysts for Fuel Cell[J]. Acta Physico-Chimica Sinica, ;2013, 29(01): 95-101. doi: 10.3866/PKU.WHXB201209272 shu

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

CAO Chun-Hui ^1,2 ,
LIN Rui ^1,2, ,
ZHAO Tian-Tian ^1,2 ,
HUANG Zhen ^1,2 ,
MA Jian-Xin ^1,2,

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 Date: 11 July 2012
Available Online: 27 September 2012
Fund Project: 国家自然科学基金(21276199) (21276199)同济大学青年优秀人才基金(2006KJ022) (2006KJ022)上海市重点学科建设项目(B303) (B303)(B08019)资助 (B08019)

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