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http://dx.doi.org/10.1016/j.cap.2012.03.028

Nickel-cobalt oxide/activated carbon composite electrodes for electrochemical capacitors  

Chang, Sook-Keng (Department of Chemistry, Faculty of Science, Universiti Putra Malaysia)
Zainal, Zulkarnain (Department of Chemistry, Faculty of Science, Universiti Putra Malaysia)
Tan, Kar-Ban (Department of Chemistry, Faculty of Science, Universiti Putra Malaysia)
Yusof, Nor Azah (Department of Chemistry, Faculty of Science, Universiti Putra Malaysia)
Yusoff, Wan Mohamad Daud Wan (Department of Physics, Faculty of Science, Universiti Putra Malaysia)
Prabaharan, S.R.S. (Department of Physics, Faculty of Science, Universiti Putra Malaysia)
Publication Information
Current Applied Physics / v.12, no.6, 2012 , pp. 1421-1428 More about this Journal
Abstract
Nanostructured synthesis of nickel-cobalt oxide/activated carbon composite by adapting a co-precipitation protocol was revealed by transmission electron microscopy. X-ray diffraction analysis confirmed that nickel-cobalt oxide spinel phase was maintained in the pure and composite phases. Cyclic voltammetry, galvanostatic charge-discharge 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 nickel-cobalt oxide before showing a decrement for heavily-loaded electrodes. Utilisation of nickel-cobalt 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.
Keywords
Nickel-cobalt oxide; Activated carbon; Composite; Specific capacitance; Pseudocapacitance;
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