期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 19, 期 1, 页码 229-239出版社
SPRINGER
DOI: 10.1007/s10008-014-2595-8
关键词
Reduced graphene oxide; Nickel hydroxide; Ammonia; Supercapacitor
资金
- Foundation of Science and Technology Projects of Guangdong Province [11A24060559, 2011B090300018]
- Fundamental Research Funds for the Central Universities [21612109]
- Research and innovation project of Jinan University for Excellent Master [201321]
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide (rGO&Ni(OH)(2)) was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The results showed that the agglomeration and re-stacking of rGO could be effectively prevented, resulting in few-layer rGO nanosheet with high specific surface area of 891.22 m(2)/g which could supply large available area for loading nanoparticle. After the incorporation of Ni(OH)(2) nanoparticle, the rGO&Ni(OH)(2) composite owned excellent electrochemical performance thanks to effective prevention of agglomeration and re-stacking of rGO with large size of the sp(2) domain, no residual of pre-stabilizer of ammonia, and tight contact between rGO and Ni(OH)(2). Specifically, the rGO&Ni(OH)(2) electrode exhibited excellent stability at scan rates from 100 to 300 mV/s. A high specific capacitance of 1,008 F/g was obtained at high current density of 42 A/g in 6 mol/L KOH aqueous electrolyte, and the specific capacitance demonstrated good rate capability. Moreover, rGO&Ni(OH)(2) electrode showed a long cycle life, retaining 74 % specific capacitance after 2,000 cycles at current density of 6 A/g. The advantages of easy process and excellent electrochemical property suggested great potential application of rGO&Ni(OH)(2) in supercapacitors.
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