Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 6, Pages 4563-4572Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b02864
Keywords
co(2)(OH)(3)Cl-MnO2; Three-dimensional (3D) macroporous spheres; Hybrid material; Asymmetric supercapacitors
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Funding
- National Natural Science Foundation of China [21507054]
- Technology Foundation of Fujian Provincial Bureau Quality and Technical Supervision [FJQI2013108]
- Science and Technology Program Fujuan Educational Bureau [JA15310]
- Zhangzhou City Natural Science Foundation [ZZ2014J02]
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Three-dimensional (3D) Co-2(OH)(3)Cl-MnO2 hybrid sphere was first obtained through a facile solvothermal microwave-assisted synthesis method. Because of the 3D sphere structure with a flowerlike morphology built up by nanosheets, this type of hybrid accelerated ion transfer as well as the charge and simultaneously maximized the electroactivity of Co-2(OH)(3)Cl or MnO2 with a high capacitance of 942.2 F g(-1), which was greater than that of the single Co-2(OH)(3)C1 or MnO2. Meanwhile, an asymmetric supercapacitor device was assembled with the hybrid and active carbon (AC) as the positive and negative electrodes, which yielded a specific capacitance of 49.26 F g(-1) and a high energy density of 12.62 Wh kg at a power density of 679.10 W kg. In addition, the capacitance of this device retained 83.77% after 5000 cycles, which showed a well-defined, long cycle life.
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