Hybrid
Composite Ni(OH)<sub>2</sub>@NiCo<sub>2</sub>O<sub>4</sub> Grown on
Carbon Fiber Paper for High-Performance Supercapacitors
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Abstract
We
have successfully fabricated and tested the electrochemical performance
of supercapacitor electrodes consisting of Ni(OH)<sub>2</sub> nanosheets
coated on NiCo<sub>2</sub>O<sub>4</sub> nanosheets grown on carbon
fiber paper (CFP) current collectors. When the NiCo<sub>2</sub>O<sub>4</sub> nanosheets are replaced by Co<sub>3</sub>O<sub>4</sub> nanosheets,
however, the energy and power density as well as the rate capability
of the electrodes are significantly reduced, most likely due to the
lower conductivity of Co<sub>3</sub>O<sub>4</sub> than that of NiCo<sub>2</sub>O<sub>4.</sub> The 3D hybrid composite Ni(OH)<sub>2</sub>/NiCo<sub>2</sub>O<sub>4</sub>/CFP electrodes demonstrate a high areal capacitance
of 5.2 F/cm<sup>2</sup> at a cycling current density of 2 mA/cm<sup>2</sup>, with a capacitance retention of 79% as the cycling current
density was increased from 2 to 50 mA/cm<sup>2</sup>. The remarkable
performance of these hybrid composite electrodes implies that supercapacitors
based on them have potential for many practical applications