Journal
NANO LETTERS
Volume 13, Issue 7, Pages 3135-3139Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl401086t
Keywords
Supercapacitor; NiCo2O4 nanowire; carbon fiber paper; core/shell; cobalt and nickel hydroxide
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Funding
- Heterogeneous Functional Materials (HetroFoaM) Center, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001061]
- China Scholarship Council
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A series of flexible nanocomposite electrodes were fabricated by facile electro-deposition of cobalt and nickel double hydroxide (DH) nanosheets on porous NiCo2O4 nanowires grown radially on carbon fiber paper (CFP) for high capacity, high energy, and power density supercapacitors. Among different stoichiometries of CoxNi1xDH nanosheets studied, Co0.67Ni0.33 DHs/NiCo2O4/CFP hybrid nanoarchitecture showed the best cycling stability while maintaining high capacitance of similar to 1.64 F/cm(2) at 2 mA/cm(2). This hybrid composite electrode also exhibited excellent rate capability; the areal capacitance decreased less than 33% as the current density was increased from 2 to 90 mA/cm(2), offering excellent specific energy density (similar to 33 Wh/kg) and power density (similar to 41.25 kW/kg) at high cycling rates (up to150 mA/cm(2)).
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