期刊
CERAMICS INTERNATIONAL
卷 48, 期 10, 页码 13996-14003出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.01.284
关键词
Fiber-shaped; Supercapacitor; MnO2 ; CuO wire; Carbon nanotubes
资金
- International Science & Technology Cooperation Program of China [2014DFA60150]
- National Natural Science Foundation of China [61604086, 21776147]
- Malmstrom Endowed Fund at Hamline University
This study develops a method to fabricate flexible fiber-shaped supercapacitors, which exhibit high performance with good capacitance and cycling stability. The optimized device design and process provide desirable solutions for flexible and wearable energy storage devices.
The demand for wearable electronics has greatly promoted the development of flexible supercapacitors. Herein, we develop a series of approaches to fabricate a fiber-shaped supercapacitor with flexibility. In the device, CuO@MnO2, carbon nanotube (CNT)@MnO2 and PVA-KOH are respectively used as inner electrode, outer electrode and gel electrolyte. The approaches including in-situ growth of CNTs, in-situ etching removal of SiO2 template and in-situ filling of gel electrolyte via hydrothermal process are explored to protect the device from structure damage caused by external forces and to maximize effective contact areas between active electrode materials and gel electrolyte. The optimized supercapacitor of copper wire@CuO@MnO2//PVA-KOH// CNT@MnO2 demonstrates a good capacitive performance (5.97 F cm(-3)) and exhibits a high energy density (0.38 mWh cm(-3)) at a power density of 25.5 mW cm(-3). In addition, it has perfect cycling stability (77% after 2000 cycles) with excellent flexibility. Therefore, this work will provide desirable processes to construct fiber-shaped supercapacitors as flexible and wearable energy storage devices.
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