期刊
JOURNAL OF ENERGY STORAGE
卷 50, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2022.104697
关键词
Co (3) V (2) O (8) nanospheres; CNT; Gel polymer electrolyte; PVA; Hybrid supercapacitor; Organic electrolyte
资金
- Iran National Science Founda-tion [99001218]
- Research Council of Alzahra University
Binary metal oxides, such as Co3V2O8, hold great promise in various fields due to their tunable properties and high stabilities. By utilizing a Co3V2O8/CNT nanocomposite with porous structure as the positive electrode material, solid-state supercapacitors can achieve an extraordinary specific capacitance of 1959.92 F g(-1) at a current density of 1 A g(-1). The hybrid asymmetric solid-state device constructed with Co3V2O8/CNT as positive electrode shows a specific capacitance of 120.17 F g(-1) and excellent cycling stability with 95.26% retention after 3000 cycles.
Binary metal oxides have promise in several fields due to their tunable structure properties and high stabilities. Moreover, gel polymer electrolytes allow the fabrication of solid-state supercapacitors. In this work, to get higher specific capacitances in solid-state supercapacitors, Co3V2O8/carbon nanotube (Co3V2O8/CNT) nanocomposite with porous structure is proposed as the positive electrode material with appropriate morphological feature. The improved charge transfer rate at the electrode surface and quick ion diffusion due to the interconnected mesoporous channels of Co3V2O8/CNT nanocomposite result in extraordinary specific capacitance of 1959.92 F g(-1) at the current density of 1 A g(-1). The performance of the proposed electrode is investigated in various elec-trolytes including aqueous, organic, and gel polymer electrolytes. Finally, a hybrid asymmetric solid-state device is constructed with Co3V2O8/CNT as positive electrode, activated carbon (AC) as negative electrode, and poly-vinyl alcohol/H2SO4 (PVA/H2SO4) as gel polymer electrolyte. The specific capacitance for the device is 120.17 F g(-1) at a current density of 1 A g(-1) and the energy density of 37.55 Wh kg(-1), which is higher than the capacitance for the KOH and organic electrolyte-based devices. The solid-state device with gel polymer maintains excellent cycling stability with retention of 95.26% after 3000 cycles.
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