Journal
NANO RESEARCH
Volume 11, Issue 1, Pages 216-224Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1621-4
Keywords
in situ growth; ion-exchange reaction; hybrid Ni(OH)(2); carbon nanosheet; supercapacitor
Categories
Funding
- National Natural Science Foundation of China [20773063, 20773062, 21173119, 21273109]
- Fundamental Research Funds for the Central Universities
- Hubei Key Laboratory for Processing and Application of Catalytic Materials [CH201401]
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The growth of a Ni(OH)(2) coating on conductive carbon substrates is an efficient way to address issues related to their poor conductivity in electrochemical capacitor applications. However, the direct growth of nickel hydroxide coatings on a carbon substrate is challenging, because the surfaces of these systems are not compatible and a preoxidation treatment of the conductive carbon substrate is usually required. Herein, we present a facile preoxidation-free approach to fabricate a uniform Ni(OH)(2) coating on carbon nanosheets (CNs) by an ion-exchange reaction to achieve the in situ transformation of a MgO/C composite to a Ni(OH)(2)/C one. The obtained Ni(OH)(2)/CNs hybrids possess nanosheet morphology, a large surface area (278 m(2)/g), and homogeneous elemental distributions. When employed as supercapacitors in a three-electrode configuration, the Ni(OH)(2)/CNs hybrid achieves a large capacitance of 2,218 F/g at a current density of 1.0 A/g. Moreover, asymmetric supercapacitors fabricated with the Ni(OH)(2)/CNs hybrid exhibit superior supercapacitive performances, with a large capacity of 198 F/g, and high energy density of 56.7 Wh/kg at a power density of 4.0 kW/kg. They show excellent cycling stability with 93% capacity retention after 10,000 cycles, making the Ni(OH)(2)/CNs hybrid a promising candidate for practical applications in supercapacitor devices.
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