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Nickel-cobalt oxide/activated carbon composite electrodes for electrochemical capacitors
Sook-Keng Chang,Zulkarnain Zainal,Kar-Ban Tan,Nor Azah Yusof,Wan Mohamad Daud Wan Yusoff,S.R.S. Prabaharan 한국물리학회 2012 Current Applied Physics Vol.12 No.6
Nanostructured synthesis of nickelecobalt oxide/activated carbon composite by adapting a coprecipitation protocol was revealed by transmission electron microscopy. X-ray diffraction analysis confirmed that nickelecobalt oxide spinel phase was maintained in the pure and composite phases. Cyclic voltammetry, galvanostatic chargeedischarge tests and ac impedance spectroscopy were employed to elucidate the electrochemical properties of the composite electrodes in 1.0 M KCl. The specific capacitance which was the sum of double-layer capacitance of the activated carbon and pseudocapacitance of the metal oxide increased with the composition of nickelecobalt oxide before showing a decrement for heavily-loaded electrodes. Utilisation of nickelecobalt oxide component in the composite with 50 wt. % loading displayed a capacitance value of ~59 F g-1. The prepared composite electrodes exhibited good electrochemical stability. Nanostructured synthesis of nickelecobalt oxide/activated carbon composite by adapting a coprecipitation protocol was revealed by transmission electron microscopy. X-ray diffraction analysis confirmed that nickelecobalt oxide spinel phase was maintained in the pure and composite phases. Cyclic voltammetry, galvanostatic chargeedischarge tests and ac impedance spectroscopy were employed to elucidate the electrochemical properties of the composite electrodes in 1.0 M KCl. The specific capacitance which was the sum of double-layer capacitance of the activated carbon and pseudocapacitance of the metal oxide increased with the composition of nickelecobalt oxide before showing a decrement for heavily-loaded electrodes. Utilisation of nickelecobalt oxide component in the composite with 50 wt. % loading displayed a capacitance value of ~59 F g-1. The prepared composite electrodes exhibited good electrochemical stability.
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