Anodic deposition of porous RuO2 on stainless steel for supercapacitor studies at high current densities |
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Authors: | Sujit Kumar Mondal N Munichandraiah |
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Affiliation: | Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India |
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Abstract: | Ruthenium dioxide is deposited on stainless steel (SS) substrate by galvanostatic oxidation of Ru3+. At high current densities employed for this purpose, there is oxidation of water to oxygen, which occurs in parallel with Ru3+ oxidation. The oxygen evolution consumes a major portion of the charge. The oxygen evolution generates a high porosity to RuO2 films, which is evident from scanning electron microscopy studies. RuO2 is identified by X-ray photoelectron spectroscopy. Cyclic voltammetry and galvanostatic charge–discharge cycling studies indicate that RuO2/SS electrodes possess good capacitance properties. Specific capacitance of 276 F g−1 is obtained at current densities as high as 20 mA cm−2 (13.33 A g−1). Porous nature of RuO2 facilitates passing of high currents during charge–discharge cycling. RuO2/SS electrodes are thus useful for high power supercapacitor applications. |
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Keywords: | Porous RuO2 Anodic deposition Stainless steel substrate Supercapacitor Cyclic voltammetry Charge&ndash discharge cycling |
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