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Porous NiCo.sub.2O.sub.4 electrodes for high-energy asymmetric supercapacitor: effect of annealing
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Porous NiCo.sub.2O.sub.4 electrodes for high-energy asymmetric supercapacitor: effect of annealing
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Porous NiCo.sub.2O.sub.4 electrodes for high-energy asymmetric supercapacitor: effect of annealing
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Journal Article
Porous NiCo.sub.2O.sub.4 electrodes for high-energy asymmetric supercapacitor: effect of annealing
2023
Overview
Nickel-cobalt hydroxide thin films were synthesized using the chemical bath deposition method, and the effect of thermal annealing (373-673 K) on their physicochemical and electrochemical characteristics was explored. The X-ray diffraction study showed a cubic crystalline structure of NiCo.sub.2O.sub.4 electrode formed above annealing temperature of 573 K. Field emission scanning electron spectroscopy (FE-SEM) study revealed that after annealing, NiCo.sub.2O.sub.4 electrode showed urchin-like microspheres morphology with superhydrophilic nature. The electrode annealed at 573 K exhibited outstanding electrochemical performance with a specific capacitance of 470 F g.sup.-1 at 0.4 A g.sup.-1 current density. Over 2000 cycles, electrode demonstrated capacitive retention of 75.55%. Finally, NiCo.sub.2O.sub.4 and Fe.sub.2O.sub.3 thin films were used to construct the asymmetric supercapacitor (ASC) device. The ASC device manifested energy density of 40 Wh kg.sup.-1 at power density of 1.66 kW kg.sup.-1 and 82% retention after 2000 CV cycles.
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