Abstract
Cost-effective commercial expanded graphite (EG) was used as a raw material, and a facile in-situ electrodeposition method was adopted to synthesize a layered Ni(OH)2/EG composite electrode in an N,N-dimethylformamide-water system. Scanning electron microscopy images show that expanded graphite sheets, Ni(OH)2 nanoparticles and carbon nanotubes construct a layered structure, which not only effectively restrains restacking of EG sheets but also prevents aggregation of nickel hydroxide particles. The electrode delivers a satisfactory initial specific capacitance of 1719.5 F/g at 1 A/g with a total mass loading of 5.0 mg/cm2. Even at 10 A/g, the capacitance only decreases to 1181.3 F/g, showing a remarkable rate capability. Moreover, an optimized asymmetric supercapacitor (ASC) device was fabricated, in which the Ni(OH)2/EG electrode was used as a positive electrode and commercial activated carbon (AC) was used as a negative electrode. The ASC device can deliver a prominent energy density of 32.3 Wh/kg at power density 504.7 W/kg, and long cycling life with 79% original capacitance after 1000 cycles at 5 A/g, which can be prospective to be applied in practical devices for energy storage and conversion.
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Acknowledgements
The support received from the Open Project from State Key Lab of Catalysis (N-14-1), International Technology Collaboration of Chengdu Science and Technology Bureau, Scientific Research Foundation for Returned Scholars, Ministry of Education of China, Innovative Research Team of Southwest Petroleum University (2012XJZT002).
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Yuan, J., Tang, S., Zhu, Z. et al. Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors. J Mater Sci: Mater Electron 28, 18022–18030 (2017). https://doi.org/10.1007/s10854-017-7745-1
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DOI: https://doi.org/10.1007/s10854-017-7745-1