Direct electrochemical N-doping to carbon paper in molten LiCl‒KCl‒Li<sub>3</sub>N

Dong-hua Tian; Zhen-chao Han; Ming-yong Wang; Shu-qiang Jiao

doi:10.1007/s12613-020-2026-z

Volume 27 Issue 12

Dec. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(12): 1687-1694

Dong-hua Tian, Zhen-chao Han, Ming-yong Wang, and Shu-qiang Jiao, Direct electrochemical N-doping to carbon paper in molten LiCl‒KCl‒Li₃N, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1687-1694. https://doi.org/10.1007/s12613-020-2026-z

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Dong-hua Tian, Zhen-chao Han, Ming-yong Wang, and Shu-qiang Jiao, Direct electrochemical N-doping to carbon paper in molten LiCl‒KCl‒Li3N, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1687-1694. https://doi.org/10.1007/s12613-020-2026-z

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Research Article

Direct electrochemical N-doping to carbon paper in molten LiCl‒KCl‒Li₃N

+ Author Affiliations

Corresponding authors:
Ming-yong Wang E-mail: mywang@ustb.edu.cn

Shu-qiang Jiao E-mail: sjiao@ustb.edu.cn
Received: 31 December 2019; Revised: 16 February 2020; Accepted: 17 February 2020; Available online: 20 February 2020

Abstract

Abstract

Graphite materials are widely used as electrode materials for electrochemical energy storage. N-doping is an effective method for enhancing the electrochemical properties of graphite. A novel one-step N-doping method for complete and compact carbon paper was proposed for molten salt electrolysis in the LiCl−KCl−Li₃N system. The results show that the degree of graphitization of carbon paper can be improved by the electrolysis of molten salts, especially at 2.0 V. Nitrogen gas was produced at the anode and nitrogen atoms can substitute carbon atoms of carbon paper at different sites to create nitrogen doping during the electrolysis process. The doping content of N in carbon paper is up to 13.0wt%. There were three groups of nitrogen atoms, i.e. quaternary N (N-Q), pyrrolic N (N-5), and pyridinic N (N-6) in N-doping carbon paper. N-doping carbon paper as an Al-ion battery cathode shows strong charge‒recharge properties.
- N-doping;
- carbon paper;
- molten salt electrolysis;
- electrochemical process

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