Research on Preparation and Electrocatalytic Performance of Nitrogen-Doped Graphene Supported Pt-Sn Composite Catalyst

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Abstract Nitrogen-Doped graphene suppported platinum shows a better performance in direct ethanol fuel cells (DEFCs). The high cost of Pt have seriously limited the commercialization of DEFCs. Herein, Pt-Sn supported on nitrogen-doped graphene(Pt-Sn/G-N) is synthesized via a very simple method in which graphene oxide is reduced with a series of different concentration of hydrazine hydrate. The uniform dispersion of the catalyst nanoparticles and the electrocatalytic activity of the Pt-Sn/G-N catalysts towards ethanol oxidation is examined. By controlling the different nitrogen content, the ratio of the best synergistic effect between Pt and Sn metal particles is further studied. The results indicate that both Pt and Sn loading of the catalyst reached the maximum, the ratio of Pt to Sn is 1.41 and the average particle size of Pt/Sn alloy is the smallest (1.8 nm) when the mass ratio of graphene oxide and hydrazine hydrate is 1:7. Moreover, compared with other catalysts, the Pt-Sn/G-N(1:7) exhibites the highest electrocatalytic ORR activity, long-standing stability and good tolerance against CO poisoning. That is to say, Pt and Sn of the Pt-Sn/G-N(1:7) achieve its catalytic synergistic effect, which may provide more gates for a Pt-Sn catalyst for application in direct ethanol fuel cells (DEFCs).

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	Articles by authors
	Li Huijun
	Wu Hongyu
	Wang Xiaomin

Keywords： nitrogen-doped graphene； Pt-Sn/G-N； electrocatalytic properties； synergistic effect

Received 2019-09-14;

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Li Huijun, Wu Hongyu, Wang Xiaomin.Research on Preparation and Electrocatalytic Performance of Nitrogen-Doped Graphene Supported Pt-Sn Composite Catalyst[J] Chemcial Industry and Engineering, 2020,V37(1): 69-76

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