Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 10, Pages 5578-5584Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b01347
Keywords
Electrochemical capacitor; NH4NiPO4 center dot H2O; Polypyrrole; Nanoplate; Ni foam
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Funding
- Hong Kong Scholars Program
- National Natural Science Foundation of China [51402364]
- China Postdoctoral Science Foundation [2016M592443]
- project of innovation-driven planning in Central South University
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The growth of active materials on Ni foam was proved to be an effective strategy to enhance redox reactions for electrochemical capacitors. But for NH4NiPO4 center dot H2O materials, a uniform nanostructure on Ni foam has not been achieved. Here, the NH4NiPO4 center dot H2O nanoplate arrays on Ni foam are fabricated by a facile solvothermal method. To further promote the transitions of current carries and benefit the electrochemical reactions, the surfaces of NH4NiPO4 center dot H2O nanoplate arrays were modified by a thin layer of polypyrrole through an in situ chemical polymerization method. The polypyrrole-modified NH4NiPO4 center dot H2O nanoplate arrays on Ni foam showed much enhanced specific capacitance in comparison with the bare NH4NiPO4 center dot H2O nanoplate arrays. When employing polypyrrole-modified NH4NiPO4 center dot H2O/Ni foam as a positive electrode and activated carbon as a negative electrode to assemble the asymmetric supercapacitor cells, favorable capacitance and cycling ability were achieved. Such a fabrication provides a feasible method to construct efficient electrodes for sustainable electrochemical energy storage.
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