Quantum Capacitance of Silicene-Based Electrodes from First-Principles Calculations

Silicene with a buckled atomic layer has double surfaces with a high surface/volume ratio similar to nanocarbon materials and is expected to have potential applications for supercapacitors. With first-principles calculations, it is found that introduction of vacancy defects with the doping in silice...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2018-02, Vol.122 (4), p.1903-1912
Main Authors: Yang, G. M, Xu, Q, Fan, Xiaofeng, Zheng, W. T
Format: Article
Language:English
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Summary:Silicene with a buckled atomic layer has double surfaces with a high surface/volume ratio similar to nanocarbon materials and is expected to have potential applications for supercapacitors. With first-principles calculations, it is found that introduction of vacancy defects with the doping in silicene can enhance the quantum capacitance of silicene-based electrodes. The enhancement of quantum capacitance is attributed to the presence of localized states around the Fermi level. Furthermore, the quantum capacitance is observed to increase with the increase of the defect’s concentration. It is also observed that the localized states around the Fermi level lead to spin polarization in the cases of B-doping and S-doping near the vacancies.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.7b08955