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Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors

Yuan, Jiawei; Tang, Shuihua; Zhu, Zhentao; Qin, Xiaolong; Qu, Renjie; Deng, Yuxiao; Wu, Lingshan; Li, Jie; Haarberg, Geir Martin
Journal article
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2401-FacileSynthesisNiOH-Manuscript-Tang.pdf (1.206Mb)
Permanent lenke
http://hdl.handle.net/11250/2479773
Utgivelsesdato
2017
Metadata
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  • Institutt for materialteknologi [1985]
  • Publikasjoner fra CRIStin - NTNU [26591]
Originalversjon
Journal of materials science. Materials in electronics. 2017, 28 (23), 18022-18030.   10.1007/s10854-017-7745-1
Sammendrag
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.
Utgiver
Springer Verlag
Tidsskrift
Journal of materials science. Materials in electronics

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