Ag Doped Co₃O₄ Nanowire Arrays as an Electrode Material for Electrochemical Capacitors

Abstract:

Co3O4 nanowire arrays freely standing on nickel foam are prepared via a template-free growth method，and it is doped by Ag via electrodeposition method (denoted as NWA-Ag/Co3O4，NWA represents Nanowire Arrays). The morphology of NWA-Ag/Co3O4 is examined by scanning electron microscopy. The phase structure of the NWA-Ag/Co3O4 electrode is characterized by X-ray diffraction spectroscopy. The supercapacitance behavior of the NWA-Ag/Co3O4 electrodes is investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The results show that the nanowire arrays densely cover the nickel foam substrate and have diameters around 250 nm. The NWA-Ag/Co3O4 electrodes exhibit a specific capacitance of 1009 F g−1 at a current density of 5 mA cm-2 in 6.0 mol dm-3 KOH electrolyte. The capacitance loss is less than 6.5% after 500 charge/discharge cycles at 10 mA cm-2 and with columbic efficiency higher than 97.5%.

• Periodical: Applied Mechanics and Materials (Volumes 268-270)
• Pages: 157-163
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.268-270.157
• Online since: December 2012
• Authors: Yang Xu, Ji Chun Huang, Lin Cheng, Dian Xue Cao, Gui Ling Wang
• Keywords: Cobalt Oxide, Electrochemical Capacitors, Electro-Deposition, Silver

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