N掺杂石墨烯负载Pt-Sn催化剂的制备及电催化性能研究

摘要氮掺杂石墨烯负载Pt在直接乙醇燃料电池（DEFCs）中表现出较好的性能。Pt的高成本极大地限制了DEFCs的商业化应用。因此，采用一系列不同浓度水合肼还原氧化石墨烯的简单方法，合成了氮掺杂石墨烯负载Pt-Sn （Pt-Sn/G-N）。研究了Pt-Sn/G-N催化剂纳米粒子的均匀分散对乙醇氧化的电催化活性影响。通过控制不同的氮含量，进一步研究了Pt和Sn金属颗粒最适宜协同效应的比例。结果表明：当氧化石墨烯与水合肼的质量比为1∶7时，催化剂的Pt和Sn负载均最大，Pt与Sn的比值为1.41，Pt/Sn合金的平均粒径最小（1.8 nm）。此外，与其他催化剂相比，Pt-Sn/G-N （1∶7）具有最高的电催化活性，稳定性好，抗CO中毒能力强。即Pt-Sn/G-N （1∶7）的Pt与Sn实现了催化协同作用，为Pt-Sn催化剂在直接乙醇燃料电池（DEFCs）中的应用提供了更多的途径。

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	李慧君
	武宏钰
	王晓敏

关键词： N掺杂石墨烯； Pt-Sn/G-N；电催化性能；协同效应

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).

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

Received 2019-09-14;

Fund:国家自然科学基金（U1710256，U1810204，U1810115和51572184）；山西省科技重大专项（20181102019）。

Corresponding Authors: 王晓敏,E-mail:wangxiaomin@tyut.edu.cn。 Email: wangxiaomin@tyut.edu.cn

About author: 李慧君(1990-),女,博士研究生,现从事储能材料方面的研究。

引用本文:

李慧君, 武宏钰, 王晓敏.N掺杂石墨烯负载Pt-Sn催化剂的制备及电催化性能研究[J]. 化学工业与工程, 2020,37(1): 69-76

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, 2020,37(1): 69-76

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