A nanofoam nickel cobalt layered double hydroxide (NiCo(OH)2) electrode film is fabricated on a stainless-steel substrate with the use of a simple one-step solvothermal process. The nanofoam NiCo(OH)2 electrode exhibits a high specific capacitance of 2710.2 F/g at a current density of 9.1 A/g, and a good capacity retention of ∼70% after 2000 charge-discharge cycles at a high current density of 31.8 A/g. An energy density of 60.23 Wh/kg is obtained at a power density of 1.8 kW/kg. The excellent electrochemical energy storage performance of the NiCo(OH)2 electrode is due to the synergetic effect of a significantly improved ionic diffusion and an effective charge transfer, which is linked to a well-dispersed interconnected nanofoam morphology and binder-free direct contact with the current collector.
Bibliographical noteFunding Information:
The research was supported by the National research Foundation of Korea (2015M2A2A6A02045252, 2015R1D1A1A01058851, 2015R1D1A1A01060743, 2015R1A2A2A01004782 and 2016R1A6A1A03012877). H. Im acknowledges financial support from the Dongguk University research fund.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physics and Astronomy(all)