期刊
JOURNAL OF POWER SOURCES
卷 227, 期 -, 页码 300-308出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.11.026
关键词
N-doped reduced graphene oxide; Nitrogen-containing functional group; Pseudocapacitance; Double-layer capacitance; Aqueous electrolyte
资金
- National Science Council of ROC-Taiwan [NSC 100-2628-E-007-028-MY2]
- Low Carbon Energy Research Center of National Tsing Hua University
Nitrogen-doped reduced graphene oxide (N-RGO) and reduced graphene oxide (RGO) have been synthesized by microwave-assisted hydrothermal method to discern the actual contribution of nitrogen-containing functional groups on the specific capacitance (C-S,C-T) in acidic and alkaline electrolytes. Material characterization reveals similar porosity, electrolyte-accessible surface area, element composition, and graphitic crystallinity between N-RGO and RGO except the difference in the nitrogen content. In 1 M H2SO4, additional pseudocapacitance provided by pyridinic-N and pyrrolic-N/pyridone-N is clearly observed at the potential negative to 0.6 V (vs. RHE) while this contribution in pseudocapacitance diminishes in 1 M KOH due to the lack of proton in the electrolyte for these basic functional groups to undergo redox reactions. The double-layer capacitance of N-RGO in 1 M H2SO4 in higher than that in 1 M KOH owing to the presence of N-containing functional groups which increase the electronic charge density of graphene and favor proton adsorption in the acidic electrolyte. The contribution of nitrogen-containing functional groups on C-S,C-T in acidic media is more pronounced than that in the alkaline electrolyte. This finding is crucial for the future application of N-doped carbons in supercapacitors to achieve full utilization. (C) 2012 Elsevier B.V. All rights reserved.
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