Abstract
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 m2/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 sp2 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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Acknowledgments
We would like to thank the National Natural Science Foundation of China (21271087, 51172099, 21006038, 21376104, and 51102115), the Natural Science key Foundation of Guangdong Province of China (10251007002000000), the Foundation of Science and Technology Projects of Guangdong Province (11A24060559, 2011B090300018), the Fundamental Research Funds for the Central Universities (21612109), and the Research and innovation project of Jinan University for Excellent Master (201321).
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Zhang, J.L., Liu, H.D., Huang, L.H. et al. Pre-stabilized reduced graphene oxide by ammonia as carrier for Ni(OH)2 with excellent electrochemical property. J Solid State Electrochem 19, 229–239 (2015). https://doi.org/10.1007/s10008-014-2595-8
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DOI: https://doi.org/10.1007/s10008-014-2595-8