Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 17, Issue 5, Pages 1463-1471Publisher
SPRINGER
DOI: 10.1007/s10008-013-2016-4
Keywords
Electrochemical capacitors; Surfactant; Mesoporous NiCo2O4; Sol-gel
Categories
Funding
- National Natural Science Foundation of China [21163010]
- Chinese Ministry of Education [212183]
- Natural Science Funds for Distinguished Young Scholars of Gansu Province [1111RJDA012]
- Lanzhou University of Technology [J201102]
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A promising nickel cobaltite oxide (NiCo2O4) composite electrode material was successfully synthesized by a sol-gel method and followed by a simple sintering process. The microstructure and surface morphology of NiCo2O4 modified by hexadecyltrimethylammonium bromide (CTAB) and polyvinyl alcohol were physically characterized by powder X-ray diffraction and scanning electron microscopy. Meanwhile, electrochemical performance was widely investigated in 2 M KOH aqueous electrolyte using cyclic voltammetry, galvanostatic charge-discharge test, and electrochemical impedance spectroscopy. The results show that evident porous microstructure was successfully fabricated by CTAB. The NiCo2O4 controlled by CTAB exhibited highly specific capacitance of 1,440 F g(-1) at a current density of 5 mA cm(-2). Remarkably, it still displays desirable cycle retention of 94.1 % over 1,000 cycle numbers at a current density of 20 mA cm(-2). The excellent electrochemical performance suggests its potential application in electrode material for electrochemical capacitors.
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