期刊
JOURNAL OF POWER SOURCES
卷 389, 期 -, 页码 178-187出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.04.010
关键词
Nitrogen-doped graphene; Electronic coupling; CoS2 particles; Active center; Zn-air battery
资金
- Chinese National Natural Science Foundation [11474101, U1532139]
- Outstanding Talent and Team Plans Program of South China University of Technology
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Guangdong Provincial Natural Science Foundation [2017A030313092]
- Ningbo Natural Science Foundation [2017A610059]
A simple synthetic method is developed for the synthesis of CoS2/N, S-codoped graphene. The result shows the existence of a strong electronic coupling between CoS2 and N, S-codoped graphene. The pyrrolic and pyridinic type nitrogen and Sin the form of C-S-C in N, S-codoped graphene are found to be the anchoring sites of the CoS2 nanoparticles. As a bifunctional catalyst, the CoS2/N, S-codoped graphene exhibits an oxygen reduction onset potential of 0.963 V vs. RHE and delivers an oxygen evolution overpotential of 393 mV at the current density of 10 mA cm(-2). Its oxygen reduction and evolution catalytic activities are comparable to those of the Pt/C and the state-of-art RuO2/C, respectively. Most impressively, the CoS2/N, S-codoped graphene exhibits a potential gap of 771 mV. This value is lower than those of most bifuntional catalysts reported, clearly indicating its potential use as the bifunctional catalyst to replace the noble -metal based catalysts for practical applications. Additionally, our results also suggest a great importance to prepare a single pure phase CoS2 in improving the catalytic bifunctionality of the CoS2/N, S-codoped graphene. The primary Zn-air battery with CoS2/N, S-codoped graphene shows a higher discharge peak power density than that with Pt/C.
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