Porous NiCo2O4 electrodes for high-energy asymmetric supercapacitor: effect of annealing
Source abstract
Abstract
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 NiCo2O4 electrode formed above annealing temperature of 573 K. Field emission scanning electron spectroscopy (FE-SEM) study revealed that after annealing, NiCo2O4 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−1 at 0.4 A g−1 current density. Over 2000 cycles, electrode demonstrated capacitive retention of 75.55%. Finally, NiCo2O4 and Fe2O3 thin films were used to construct the asymmetric supercapacitor (ASC) device. The ASC device manifested energy density of 40 Wh kg−1 at power density of 1.66 kW kg−1 and 82% retention after 2000 CV cycles.
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Research context
OpenAlex topics: Supercapacitor Materials and Fabrication · Advanced battery technologies research · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (60)
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