Effect of nitrogen doping on the electrochemical performance of resorcinol-formaldehyde based carbon aerogels as electrode material for supercapacitor applications

Research output: Contribution to journalArticle

Abstract

Nitrogen doped resorcinol/formaldehyde carbon aerogels with controlled nitrogen content are synthesized by controlling the resorcinol/melamine molar ratio (R/M) during the synthesis of aerogel precursors. The carbons were used as electrode materials in an electrochemical capacitor using 6M KOH solution as electrolyte. All samples exhibited amorphous structure with low degree of graphitization. The maximum specific capacitance of 208 Fg-1 was observed after doping of the carbon with nitrogen at R/M = 80. Drop in solution and charge transfer resistances from 0.57Ω to 0.15Ω and 0.05Ω to 0.04Ω was also observed respectively, with the drop in contact angles from 123º to 103º for the carbon doped with nitrogen at R/M = 80. BET results showed that the pore volume and surface area of carbon increase after N-doping, with a BET surface area of 841 m2 g-1 at R/M = 80. This R/M ratio is an optimum ratio at which incorporation of nitrogen into the carbon matrix improves the capacitive performance of cell as a result of improved porosity/wettability/conductivity/active sites of the electrode. Doping at higher nitrogen concentrations (R/M < 80) decreased the specific capacitance of the cell significantly due to decreased conductivity of carbon and suppression of the hopping rate of dopant.
Original languageEnglish
Pages (from-to)809-819
Number of pages11
JournalEnergy
Volume173
Early online date15 Feb 2019
DOIs
Publication statusPublished - 15 Apr 2019

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Aerogels
Melamine
Formaldehyde
Doping (additives)
Nitrogen
Electrodes
Carbon
Capacitance
Graphitization
Supercapacitor
Contact angle
Wetting
Charge transfer
Capacitors
Porosity
Electrolytes

Keywords

  • Nitrogen doped carbon aerogels
  • Porous structure
  • Functional groups
  • Electrode/electrolyte interface
  • Electrochemical performance

Cite this

@article{32ea02da2e6441fe9977aa4a0db6cbc2,
title = "Effect of nitrogen doping on the electrochemical performance of resorcinol-formaldehyde based carbon aerogels as electrode material for supercapacitor applications",
abstract = "Nitrogen doped resorcinol/formaldehyde carbon aerogels with controlled nitrogen content are synthesized by controlling the resorcinol/melamine molar ratio (R/M) during the synthesis of aerogel precursors. The carbons were used as electrode materials in an electrochemical capacitor using 6M KOH solution as electrolyte. All samples exhibited amorphous structure with low degree of graphitization. The maximum specific capacitance of 208 Fg-1 was observed after doping of the carbon with nitrogen at R/M = 80. Drop in solution and charge transfer resistances from 0.57Ω to 0.15Ω and 0.05Ω to 0.04Ω was also observed respectively, with the drop in contact angles from 123º to 103º for the carbon doped with nitrogen at R/M = 80. BET results showed that the pore volume and surface area of carbon increase after N-doping, with a BET surface area of 841 m2 g-1 at R/M = 80. This R/M ratio is an optimum ratio at which incorporation of nitrogen into the carbon matrix improves the capacitive performance of cell as a result of improved porosity/wettability/conductivity/active sites of the electrode. Doping at higher nitrogen concentrations (R/M < 80) decreased the specific capacitance of the cell significantly due to decreased conductivity of carbon and suppression of the hopping rate of dopant.",
keywords = "Nitrogen doped carbon aerogels, Porous structure, Functional groups, Electrode/electrolyte interface, Electrochemical performance",
author = "Mojtaba Mirzaeian and Qaisar Abbas and Des Gibson and Michal Mazur",
year = "2019",
month = "4",
day = "15",
doi = "10.1016/j.energy.2019.02.108",
language = "English",
volume = "173",
pages = "809--819",
journal = "Energy",
issn = "0360-5442",
publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Effect of nitrogen doping on the electrochemical performance of resorcinol-formaldehyde based carbon aerogels as electrode material for supercapacitor applications

AU - Mirzaeian, Mojtaba

AU - Abbas, Qaisar

AU - Gibson, Des

AU - Mazur, Michal

PY - 2019/4/15

Y1 - 2019/4/15

N2 - Nitrogen doped resorcinol/formaldehyde carbon aerogels with controlled nitrogen content are synthesized by controlling the resorcinol/melamine molar ratio (R/M) during the synthesis of aerogel precursors. The carbons were used as electrode materials in an electrochemical capacitor using 6M KOH solution as electrolyte. All samples exhibited amorphous structure with low degree of graphitization. The maximum specific capacitance of 208 Fg-1 was observed after doping of the carbon with nitrogen at R/M = 80. Drop in solution and charge transfer resistances from 0.57Ω to 0.15Ω and 0.05Ω to 0.04Ω was also observed respectively, with the drop in contact angles from 123º to 103º for the carbon doped with nitrogen at R/M = 80. BET results showed that the pore volume and surface area of carbon increase after N-doping, with a BET surface area of 841 m2 g-1 at R/M = 80. This R/M ratio is an optimum ratio at which incorporation of nitrogen into the carbon matrix improves the capacitive performance of cell as a result of improved porosity/wettability/conductivity/active sites of the electrode. Doping at higher nitrogen concentrations (R/M < 80) decreased the specific capacitance of the cell significantly due to decreased conductivity of carbon and suppression of the hopping rate of dopant.

AB - Nitrogen doped resorcinol/formaldehyde carbon aerogels with controlled nitrogen content are synthesized by controlling the resorcinol/melamine molar ratio (R/M) during the synthesis of aerogel precursors. The carbons were used as electrode materials in an electrochemical capacitor using 6M KOH solution as electrolyte. All samples exhibited amorphous structure with low degree of graphitization. The maximum specific capacitance of 208 Fg-1 was observed after doping of the carbon with nitrogen at R/M = 80. Drop in solution and charge transfer resistances from 0.57Ω to 0.15Ω and 0.05Ω to 0.04Ω was also observed respectively, with the drop in contact angles from 123º to 103º for the carbon doped with nitrogen at R/M = 80. BET results showed that the pore volume and surface area of carbon increase after N-doping, with a BET surface area of 841 m2 g-1 at R/M = 80. This R/M ratio is an optimum ratio at which incorporation of nitrogen into the carbon matrix improves the capacitive performance of cell as a result of improved porosity/wettability/conductivity/active sites of the electrode. Doping at higher nitrogen concentrations (R/M < 80) decreased the specific capacitance of the cell significantly due to decreased conductivity of carbon and suppression of the hopping rate of dopant.

KW - Nitrogen doped carbon aerogels

KW - Porous structure

KW - Functional groups

KW - Electrode/electrolyte interface

KW - Electrochemical performance

U2 - 10.1016/j.energy.2019.02.108

DO - 10.1016/j.energy.2019.02.108

M3 - Article

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EP - 819

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SN - 0360-5442

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