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Lee, Ming-Tsung; Tsai, Wen-Ta; Cheng, Hui-Fang; Sun, I-Wen; Chang, Jeng-Kuei
Journal of power sources, 07/2013, Letnik: 233Journal Article
The electrochemical behavior of anodically deposited Mn oxide in N-butyl-N-methylpyrrolidiniumadicyanamide (BMPaDCA) ionic liquid (IL) at various temperatures (30a80 degree C) is investigated. Cyclic voltammetry (CV) is used to evaluate the electrochemical performance of the Mn oxide. Surface morphology of the deposited oxide after charging/discharging is examined by scanning electron microscopy (SEM). The experimental data show that the Mn oxide electrode exhibits good pseudo-capacitance performance even at 80 degree C. In the ionic liquid studied, the specific capacitance increases with increasing BMPaDCA IL temperature. A specific capacitance of 93 F g-1 in a potential window of 3 V is obtained at 80 degree C, which is about 50% higher than that obtained at 30 degree C. The experimental results also show that the capacitance-retained ratio of the oxide electrode increases with increasing temperature at a high potential sweep rate. Furthermore, the capacitance decline about 40% after 500 repeated charging/discharging cycles in BMPaDCA IL at 80 degree C is observed, which is better than that measured in an aqueous electrolyte.
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