期刊
ELECTROCHIMICA ACTA
卷 299, 期 -, 页码 245-252出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.12.187
关键词
Asymmetric supercapacitor; High mass loading; Tungsten oxide
资金
- National Research Foundation of Korea [NRF-2015M3A7B 4050 424]
The increasing interest in portable and consumable electronics demands efficient and low-cost energy storage devices with excellent energy storing capacity. From this point, a high mass loading of the active electrode material on three-dimensional current collectors is favorable for obtaining a higher energy storing capacity for the corresponding device. The present study demonstrates an ideal example of high-performance aqueous asymmetric supercapacitors (SCs) using alpha-MnO2 nanowires as the positive electrode and h-WO3 nanorods as the negative electrode, respectively. Initially, one-dimensional (1D) nanostructures composed of alpha-MnO2 and h-WO3 are prepared on carbon cloth by a conventional hydrothermal method. The prepared alpha-MnO2 and h-WO3 with a high mass loading of 4.9 mg/cm(2) and 5.8 mg/cm(2), respectively, show excellent electrochemical features in aqueous Na2SO4 electrolyte in the positive and negative potential regions. A high-performance asymmetric SC is developed with uniquely engineered electrodes, which exhibits the excellent electrochemical performance in an extended potential window of 1.4 V and with excellent cycling stability of similar to 135% after 7500 cycles with a volumetric capacitance of 350 mF/cm(3) and energy density of 0.095 mWh/cm(3). This authentic scheme may offer new opportunities for developing asymmetric arrangements for energy storage devices in various portable electronic systems with a high mass loading. (C) 2019 Elsevier Ltd. All rights reserved.
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