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Oxygen functional groups on a commercial activated carbon were modified by (NH4)2S2O8 oxidation and subsequent annealing at different temperatures. The effects of the surface modification on the electrochemical performance as supercapacitor electrodes were investigated by XPS, FTIR, argon adsorption and electrochemical tests. Results indicate that the oxygen functional groups, especially carboxyl and carbonyl groups improved the wettability of the pore surfaces, increased the electrolyte diffusion rate into the electrode and increased the specific capacitance by an additional pseudo-capacitance in a 6 mol/L KOH aqueous electrolyte. An excess oxygen content blocked the pores, leading to poor electrochemical performance, but annealing at 300 in an inert atmosphere increased the specific capacitance and improved the rate performance in a 6 mol/L KOH aqueous electrolyte. In a 1 mol/L Et4NBF4/PC organic electrolyte, however, oxygen functional groups introduced by (NH4)2S2O8 oxidation reduced the specific capacitance and annealing at 700 to reduce their content effectively increased the specific capacitance. © 2020, Science Press. All right reserved.
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New Carbon Materials
ISSN: 1007-8827
Year: 2020
Issue: 3
Volume: 35
Page: 232-243
1 . 9 0 5
JCR@2020
6 . 6 0 0
JCR@2023
ESI HC Threshold:196
JCR Journal Grade:4
CAS Journal Grade:3
Cited Count:
SCOPUS Cited Count: 116
ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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