期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 869, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159300
关键词
Supercapacitor; SU-8 photoresist; 3D microelectrode; Conductive carbon fibers; RuO2
资金
- Ministry of Science and Technology (MOST) of the Republic of China (Taiwan)
- MOST [105-2221E-003-004]
This study utilized C-MEMS technology to fabricate a 3D microelectrode array on a graphite substrate, resulting in a high specific capacitance. By decorating the array with composite materials, the capacitance was further enhanced. The electrode decorated with RuO2 30 wt%/CF showed excellent capacitance performance in galvanostatic charge-discharge tests.
This study employed a carbon microelectromechanical system (C-MEMS) in fabricating a 3D microelectrode array of conductive carbon cylinders directly on the surface of a graphite substrate. The capacitance of the array was further enhanced by decorating it with a composite material comprising highly-porous carbon nanofibers (CF) and electroactive RuO2 nanoparticles to function as an active electrode. In galvanostatic charge-discharge tests, the specific capacitance of an electrode decorated with RuO2 30 wt%/CF was 219.2 F g(-1) at a current density of 0.5 A g(-1), which is 2.27 times higher than that of the pristine CF electrode. When the current density was increased from 0.5 A g(-1) to 3 A g(-1), the capacitance retention of the RuO2 30 wt%/CF electrode was 54.8%. A symmetric supercapacitor based on the RuO2 30 wt%/CF composite electrode exhibited an impressive energy density of 74.2 Wh kg(-1) with power density of 4333 W kg(-1). It also demonstrated good capacitance retention of 80.2% following 3000 consecutive charge/discharge cycles at a current density of 2 A g(-1). (C) 2021 Elsevier B.V. All rights reserved.
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