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Title: Enhancing Graphene Capacitance by Nitrogen: Effects of Doping Configuration and Concentration

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.

Authors:
 [1];  [2];  [1]
  1. Univ. of California, Riverside, CA (United States)
  2. Vanderbilt Univ., Nashville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1261372
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP
Additional Journal Information:
Journal Volume: 18; Journal Issue: 6; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Zhan, Cheng, Cummings, Peter, and Jiang, De-en. Enhancing Graphene Capacitance by Nitrogen: Effects of Doping Configuration and Concentration. United States: N. p., 2016. Web. doi:10.1039/C5CP06952A.
Zhan, Cheng, Cummings, Peter, & Jiang, De-en. Enhancing Graphene Capacitance by Nitrogen: Effects of Doping Configuration and Concentration. United States. https://doi.org/10.1039/C5CP06952A
Zhan, Cheng, Cummings, Peter, and Jiang, De-en. Fri . "Enhancing Graphene Capacitance by Nitrogen: Effects of Doping Configuration and Concentration". United States. https://doi.org/10.1039/C5CP06952A. https://www.osti.gov/servlets/purl/1261372.
@article{osti_1261372,
title = {Enhancing Graphene Capacitance by Nitrogen: Effects of Doping Configuration and Concentration},
author = {Zhan, Cheng and Cummings, Peter and Jiang, De-en},
abstractNote = {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.},
doi = {10.1039/C5CP06952A},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 6,
volume = 18,
place = {United States},
year = {Fri Jan 08 00:00:00 EST 2016},
month = {Fri Jan 08 00:00:00 EST 2016}
}

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