Journal
JOURNAL OF POWER SOURCES
Volume 223, Issue -, Pages 190-198Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.09.073
Keywords
Core-shell structure; Co@Pt/C catalyst; Electrochemical performance; Single cell test; Durability
Funding
- National Natural Science Foundation of China [20703031]
- Doctoral Program of Higher education [20070247055]
- Program for Young Excellent Talents in Tongji University [2006KJ022]
- Shanghai Leading Academic Discipline Project [B303]
- 111 Project [B08019]
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Co@Pt/C core-shell catalysts are synthesized by a two-step chemical reduction method followed by the heat treatment in H-2 and N-2 mixture. High Resolution (HR-TEM), EDX (Energy-dispersive X-ray spectroscopy) and in-situ X-ray diffraction (XRD) techniques are used to characterize the nano-structured catalysts. The results show that the core-shell structure of Co@Pt/C is formed and the average particle size is about 3 nm. From the result of the in-situ XRD, it is found that the heat treatment favors for the formation of crystalline structure and the proper particle size of catalyst. The in-situ XRD detection also helps find the optimized heat treatment temperature. The linear sweep voltammetry (LSV) result reveals that the Co@Pt (1:3)/C (reduced) catalyst exhibits the best catalytic activity toward oxygen reduction reaction (ORR). A 130 h life time test for the single cell, in which the membrane electrode assembly (MEA) using Co@Pt (1:3)/C (reduced) as the cathode catalyst, is operated to evaluate the durability. The results of the test show that the formation of the core-shell structure of Co@Pt/C catalyst is favorable to improve the stability and durability. (C) 2012 Elsevier B.V. All rights reserved.
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