https://scholars.lib.ntu.edu.tw/handle/123456789/408981
標題: | 1.2 Volt manganese oxide symmetric supercapacitor | 作者: | Ataherian F. Wu N.-L. |
關鍵字: | Capacitance fading;Cycle life;Electrochemical capacitor;Manganese oxide | 公開日期: | 2011 | 卷: | 13 | 期: | 11 | 起(迄)頁: | 1264-1267 | 來源出版物: | Electrochemistry Communications | 摘要: | Capacitance fading of MnO2 supercapacitor electrode under negative polarization below 0.0 V (versus Ag/AgCl/sat. KCl(aq)) arises from extensive reduction of Mn(IV) to form inactive Mn(II) species, and this has typically limited the operating voltage window of an aqueous symmetric MnO2 supercapacitor to be no greater than 0.8 V. As this lower potential limit is close to the onset potential of MnO2-catalyzed oxygen reduction reaction (ORR), the fading problem can be alleviated by effectively passing the accumulated electrons in the oxide electrode to the dissolved oxygen molecules in electrolyte in order to avoid the formation of the surface Mn(II) species. This has been demonstrated by either increasing the dissolved oxygen content or using the Ti(IV)/Ti(III) redox couple in the electrolyte as a charge-transfer mediator to enhance the electrocatalytic activity of MnO2 for ORR. Therefore, a MnO2 symmetric supercapacitor showing remarkable cycling stability over an operating voltage window of 1.2 V has been achieved by using Ti(IV)-containing neutral electrolyte (1 M KCl(aq)). ? 2011 Elsevier B.V. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408981 | ISSN: | 13882481 | DOI: | 10.1016/j.elecom.2011.08.028 |
顯示於: | 化學工程學系 |
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