Gunasekaran, Sivagaami Sundari and Gopalakrishnan, Arthi and Subashchandrabose, Raghu and Badhulika, Sushmee
(2021)
Phytogenic generation of NiO nanoparticles as green-electrode material for high performance asymmetric supercapacitor applications.
Journal of Energy Storage, 37.
p. 102412.
ISSN 2352152X
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Abstract
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|| 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|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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