Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 159, Issue 8, Pages A1262-A1266Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.057208jes
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Funding
- National Natural Science Foundation of China [21163010]
- Chinese Ministry of Education [212183]
- Natural Science Funds for Distinguished Young Scholars of Gansu Province [1111RJDA012]
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High performance nickel cobaltite (NiCo2O4) with ultrahigh capacitance is synthesized by a facile sol-gel process and then calcined at 300 degrees C. The structure and morphology is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and nitrogen adsorption/desorption experiments. A mesoporous structure with high specific surface area is obtained. Electrochemical properties are investigated by cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). The NiCo2O4 exhibits excellent electrochemical performance. The highest specific capacitance of 1128 F g(-1) is achieved at a current density of 5 mA cm(-2) and 92.5% of the initial specific capacitance remained after 1000 cycles. NiCo2O4 prepared by this scale-able route could be a promising electrode material for electrochemical capacitors. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.057208jes] All rights reserved.
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