期刊
JOURNAL OF ENERGY STORAGE
卷 37, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2021.102412
关键词
Green synthesis; Opuntia ficus indica; NiO; Activated carbon; Asymmetric supercapacitor; Biomass
资金
- Scientific and Engineering Research Board (SERB) [SB/WEA03/2017]
A simple, cost-effective, one-step green synthesis of nickel oxide nanoparticles from Opuntia ficus-indica leaves extract was reported for asymmetric supercapacitor application. The NiO-NPs exhibited high specific capacitance and excellent energy density, making them a promising alternative for energy storage applications.
Herein, we report a simple, cost-effective, one-step green synthesis of nickel oxide nanoparticles (NiO-NPs) from Opuntia ficus-indica leaves extract for asymmetric supercapacitor application. The plant extract derived NiO-NPs exhibits an exceptional half-cell specific capacitance of 644 Fg(-1) (-89.4 mAhg(-1)) at 0.5 Ag-1. The assembled asymmetric NiO-NPs parallel to activated carbon (AC) supercapacitor cell delivers high specific capacitance of -280 Fg(-1) (-38.8 mAhg(-1)), excellent specific energy of 25 Wh kg(-1). In addition, the NiO-NPs vertical bar AC device works until 1.4 V with 0.1 M KOH as electrolyte delivering an excellent rate capability and high coulombic efficiency of 124% even after 10,000 cycles. Moreover, the biomass derived NiO NPs performs better than the other reported NiO based compounds, due to its presence of nickel-rich natural minerals. Through these findings, the use of plant leaves like Opuntia ficus-indica is hereby shown to be low-cost, environment-friendly alternative for preparing NiO- based composites for energy storage applications.
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