Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 6, Pages 4856-4868Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00279
Keywords
MnO2@NiCo2O4 core-shell heterostructure; Porous carbon; Electrochemical performance; All-solid-state supercapacitors; Energy storage
Categories
Funding
- Natural Science Foundation of China [51674221]
- China Postdoctoral Science Foundation [2016M591405]
- Youth Scholars Research Fund of Yanshan University [16GA012]
- Science and Technology Research and Development Program of Qinhuangdao [201602A004]
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A stable alpha-MnO2 nanowire@NiCo2O4 nanosheet core-shell heterostructure and a 3D-nanocage N-doped porous carbon nanosheet with high electrical conductivity are synthesized by a two-solution phase reaction and a facile onestep self-template technique, respectively. The unique alpha-MnO2@ NiCo2O4 heterostructure is characterized by a stable nanostructure, fast electron transport, and numerous ion diffusion channels. The electrode exhibits a high specific capacitance of 1101 F and a cycling stability of 95.8% after 10 000 cycles. Moreover, by introducing N atoms which is favorable for rate performance, the 3D porous carbon offers a large surface area, a proper pore structure and especially high electron conductivity. The specific capacitance of the 3D N-doped porous nanocage carbon electrode reaches 100 F g(-1) at a current densities as high as 100 A The all-solid-state symmetric supercapacitor with excellent electrochemical properties is fabricated using the alpha-MnO2@NiCo2O4 core-shell heterostructure as positive electrode, a 3D N-doped porous nanocage carbon as negative electrode, and a PAAK/KOH gel as solid-state electrolyte. The supercapacitor demonstrates an expanded working potential of 1.7 V, a maximum energy density of 46.2 Wh kg(-1), a maximum power density of 15.3 kW kg(-1), and good capacitance retention of 90% after 2000 cycles.
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