Abstract
A manganese–cobalt coating was electrodeposited from an aqueous solution and then converted to a manganese–cobalt oxide by anodic oxidation. The composition, morphology, structure, and pseudocapacitive performance of the obtained oxide were evaluated by X-ray fluorescence, X-ray photoelectron spectroscopy, scanning electron microscope, cyclic voltammetry, and electrochemical impedance spectroscope. The results show that after anodic oxidation, the manganese in the obtained binary oxide exists as Mn4+ oxide and the cobalt as Co3O4. The as-prepared manganese-cobalt oxide with a cobalt content of 4.87 % is amorphous and porous, which exhibits a symmetrical and rectangular cyclic voltammetry curve in the scan-rate range from 5 to 100 mV s−1 and a specific capacitance of 231.6 F g−1 at 5 mV s−1. The capacitance loss of the symmetric supercapacitor assembled with these electrodes is just about 2 % after 500 charge–discharge cycles. Compared to the pure porous manganese oxide obtained by the same method, the electrochemical impedance spectroscopy and galvanostatic charge–discharge tests reveal that the binary oxide has a lower charge-transfer resistance, higher doubly layer capacitance, and pseudocapacitance.
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Acknowledgments
The authors acknowledge the financial supports of the National Natural Science Foundation of China (Grant No. 51374252), the China Postdoctoral Science Foundation (Grant No. 2013M542139) and the Hunan Provincial Natural Science Foundation of China (Grant No. 12JJ3014).
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Chen, Y., Wang, JW., Shi, XC. et al. Electrochemical fabrication of porous manganese–cobalt oxide films for electrochemical capacitors. J Appl Electrochem 45, 495–501 (2015). https://doi.org/10.1007/s10800-015-0819-y
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DOI: https://doi.org/10.1007/s10800-015-0819-y