期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 163, 期 10, 页码 A2340-A2348出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.1031610jes
关键词
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资金
- Yamaguchi Industrial Promotion Foundation
- Yamaguchi University Opt-Energy Research Centre
- Grants-in-Aid for Scientific Research [16K05938] Funding Source: KAKEN
This paper reports a facile means of fabricating a flexible supercapacitor with excellent cycling stability, based on the use of carbon cloth (CC) activated and subsequently modified with birnessite-type MnO2. In this study, sections of commercially-available CC were treated using a simple wet method and then served as substrates for the direct growth of MnO2 via an electrochemical process. The resulting CC electrodes allowed the deposition of a large amount of MnO2 while maintaining its electrochemical utilization efficiency. The optimal mass loading of MnO2 was determined to be 4.27 mg cm(-2), a level that gave an areal capacitance of 568 mF cm(-2) at a scan rate of 2 mV s(-1). This MnO2/CC material was employed in conjunction with an activated carbon-coated CC section as the positive and negative electrodes, respectively, in a solid-state asymmetric supercapacitor. The device generated a cell voltage of 2.0 V with a maximum volumetric energy density of 0.978 mWh cm(-3) at a minimum power density of 3.52 x 10(-3) Wcm(-3) and 0.439 mWh cm(-3) at 0.158 W cm(-3). This performance was maintained at 94.4% of the original level, even after 10,000 cycles, at a constant current density of 50 mA cm(-2). (C) 2016 The Electrochemical Society. All rights reserved.
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