Enhancing graphene capacitance by nitrogen: effects of doping configuration and concentration

Physical Chemistry Chemical Physics : PCCP
Cheng ZhanDe-en Jiang

Abstract

Recent experiments have shown that nitrogen doping enhances capacitance in carbon electrode supercapacitors. However, a detailed study of the effect of N-doping on capacitance is still lacking. In this paper, we study the doping concentration and the configuration effect on the electric double-layer (EDL) capacitance, quantum capacitance, and total capacitance. It is found that pyridinic and graphitic nitrogens can increase the total capacitance by increasing quantum capacitance, but pyrrolic configuration limits the total capacitance due to its much lower quantum capacitance than the other two configurations. We also find that, unlike the graphitic and pyridinic nitrogens, the pyrrolic configuration's quantum capacitance does not depend on the nitrogen concentration, which may explain why some capacitance versus voltage measurements of N-doped graphene exhibit a V-shaped curve similar to that of undoped graphene. Our investigation provides a deeper understanding of the capacitance enhancement of the N-doping effect in carbon electrodes and suggests a potentially effective way to optimize the capacitance by controlling the type of N-doping.

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Citations

Feb 18, 2016·The Journal of Physical Chemistry Letters·Cheng Zhan, De-en Jiang
Dec 16, 2016·The Journal of Physical Chemistry Letters·Huachao YangKefa Cen
Feb 10, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Dejan KepićGerard Tobias
Aug 23, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Cheng LianJianzhong Wu
Feb 21, 2018·Scientific Reports·Chiranjeevi MaddiFlorence Garrelie
Jul 5, 2019·Physical Chemistry Chemical Physics : PCCP·Eudes Eterno Fileti, Guilherme Colherinhas
Jun 19, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·T Sruthi, Tarafder Kartick
Sep 15, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jenel VatamanuDmitry Bedrov
Feb 6, 2020·Physical Chemistry Chemical Physics : PCCP·Débora A C da SilvaHudson G Zanin
Jul 21, 2017·Advanced Science·Cheng ZhanDavid J Wesolowski
Oct 9, 2018·ACS Applied Materials & Interfaces·Cheng ZhanMonika Biener
Oct 15, 2019·ACS Applied Materials & Interfaces·Yu Zhang, Peter T Cummings
Jun 18, 2019·Nano Letters·Sun Sang KwonSungWoo Nam

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