Abstract
A two-step method consisting of solid-state microwave irradiation and heat treatment under NH3 gas was used to prepare nitrogen-doped reduced graphene oxide (N-RGO) with a high specific surface area (1007 m2g-1), high electrical conductivity (1532 Sm-1), and low oxygen content (1.5 wt%) for electrical double-layer capacitor applications. The specific capacitance of N-RGO was 291 Fg-1 at a current density of 1 Ag-1, and a capacitance of 261 Fg-1 was retained at 50 Ag-1, which indicated a very good rate capability. N-RGO also showed excellent cycling stability and preserved 96% of the initial specific capacitance after 100000 cycles. Near-edge X-ray absorption fine-structure spectroscopy results provided evidenced for the recovery of π conjugation in the carbon networks with the removal of oxygenated groups and revealed chemical bonding of the nitrogen atoms in N-RGO. The good electrochemical performance of N-RGO is attributed to its high surface area, high electrical conductivity, and low oxygen content. Between the sheets: Nitrogen-doped reduced graphene oxide (N-RGO) shows excellent electrochemical performance and stability as an electrode material for electrical double-layer capacitors due to its high surface area and electrical conductivity. The two-step synthesis incorporates nitrogen into the hexagonal carbon lattice and restores π conjugation.
| Original language | English |
|---|---|
| Pages (from-to) | 1875-1884 |
| Number of pages | 10 |
| Journal | ChemSusChem |
| Volume | 8 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2015 Jun 1 |
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All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)
- Energy(all)
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High-surface-area nitrogen-doped reduced graphene oxide for electric double-layer capacitors. / Youn, Hee Chang; Bak, Seong Min; Kim, Myeong Seong; Jaye, Cherno; Fischer, Daniel A.; Lee, Chang Wook; Yang, Xiao Qing; Roh, Kwang Chul; Kim, Kwang Bum.
In: ChemSusChem, Vol. 8, No. 11, 01.06.2015, p. 1875-1884.Research output: Contribution to journal › Article
TY - JOUR
T1 - High-surface-area nitrogen-doped reduced graphene oxide for electric double-layer capacitors
AU - Youn, Hee Chang
AU - Bak, Seong Min
AU - Kim, Myeong Seong
AU - Jaye, Cherno
AU - Fischer, Daniel A.
AU - Lee, Chang Wook
AU - Yang, Xiao Qing
AU - Roh, Kwang Chul
AU - Kim, Kwang Bum
PY - 2015/6/1
Y1 - 2015/6/1
N2 - A two-step method consisting of solid-state microwave irradiation and heat treatment under NH3 gas was used to prepare nitrogen-doped reduced graphene oxide (N-RGO) with a high specific surface area (1007 m2g-1), high electrical conductivity (1532 Sm-1), and low oxygen content (1.5 wt%) for electrical double-layer capacitor applications. The specific capacitance of N-RGO was 291 Fg-1 at a current density of 1 Ag-1, and a capacitance of 261 Fg-1 was retained at 50 Ag-1, which indicated a very good rate capability. N-RGO also showed excellent cycling stability and preserved 96% of the initial specific capacitance after 100000 cycles. Near-edge X-ray absorption fine-structure spectroscopy results provided evidenced for the recovery of π conjugation in the carbon networks with the removal of oxygenated groups and revealed chemical bonding of the nitrogen atoms in N-RGO. The good electrochemical performance of N-RGO is attributed to its high surface area, high electrical conductivity, and low oxygen content. Between the sheets: Nitrogen-doped reduced graphene oxide (N-RGO) shows excellent electrochemical performance and stability as an electrode material for electrical double-layer capacitors due to its high surface area and electrical conductivity. The two-step synthesis incorporates nitrogen into the hexagonal carbon lattice and restores π conjugation.
AB - A two-step method consisting of solid-state microwave irradiation and heat treatment under NH3 gas was used to prepare nitrogen-doped reduced graphene oxide (N-RGO) with a high specific surface area (1007 m2g-1), high electrical conductivity (1532 Sm-1), and low oxygen content (1.5 wt%) for electrical double-layer capacitor applications. The specific capacitance of N-RGO was 291 Fg-1 at a current density of 1 Ag-1, and a capacitance of 261 Fg-1 was retained at 50 Ag-1, which indicated a very good rate capability. N-RGO also showed excellent cycling stability and preserved 96% of the initial specific capacitance after 100000 cycles. Near-edge X-ray absorption fine-structure spectroscopy results provided evidenced for the recovery of π conjugation in the carbon networks with the removal of oxygenated groups and revealed chemical bonding of the nitrogen atoms in N-RGO. The good electrochemical performance of N-RGO is attributed to its high surface area, high electrical conductivity, and low oxygen content. Between the sheets: Nitrogen-doped reduced graphene oxide (N-RGO) shows excellent electrochemical performance and stability as an electrode material for electrical double-layer capacitors due to its high surface area and electrical conductivity. The two-step synthesis incorporates nitrogen into the hexagonal carbon lattice and restores π conjugation.
UR - http://www.scopus.com/inward/record.url?scp=84930615029&partnerID=8YFLogxK
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U2 - 10.1002/cssc.201500122
DO - 10.1002/cssc.201500122
M3 - Article
C2 - 25916491
AN - SCOPUS:84930615029
VL - 8
SP - 1875
EP - 1884
JO - ChemSusChem
JF - ChemSusChem
SN - 1864-5631
IS - 11
ER -