水系硝酸マグネシウム電解液のEDLCへの適用とその電気化学的挙動
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概要
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Electrochemical characteristics of an aqueous manganese nitrate [Mg(NO3)2] electrolyte system have been investigated for electric double layer capacitor (EDLC) applications. Its electrochemical activity has been examined in a concentration range from 0.1 to 1.0 mol dm−3 by using a symmetric capacitor based on activated carbon (AC) electrodes. The capacitor performances were evaluated by impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge experiments at temperature 25°C. The observed results show essentially capacitive behaviors within a tested potential region from 0 to 0.8 V vs. an Ag/AgCl reference electrode. The cell capacitance varies with the electrolyte concentration and the measured potential window. The maximum observed capacitance was 124 F g−1 (energy density: 8.5 Wh kg−1). We have confirmed good reversibility of Mg2+ adsorption/desorption and the stability of the aqueous electrolyte within the applied potential limit. The results show an ideal capacitor nature with a significant energy density value.
著者
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高 明天
Chemical Division, Fundamental Research Department, Daikin Industries Ltd.
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山内 昭佳
Chemical Division, Fundamental Research Department, Daikin Industries Ltd.
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Ishikawa Masashi
Department Of Applied Chemistry And Chemical Engineering Faculty Of Engineering Yamaguchi University
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CHANDRASEKARAN Ramasamy
Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University
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YAMAUCHI Akiyoshi
Chemical Division, Fundamental Research Department, Daikin Industries Ltd.
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ISHIKAWA Masashi
Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University
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