| Abstrakt: |
The present study focuses on the advancement of novel electrode materials for supercapacitors by dispersing SiO2nanomatrix engendered from coal fly ash (Tuticorin Thermal Power Plant) encrusting with spinel metal ferrites (NiFe2O4(1:1)) to form SiO2-NiFe2O4nanocomposites with excellent electrochemical performance. Changes in the morphology of NiFe2O4and SiO2-NiFe2O4can appreciably increase the specific capacitance of the energy storage device (supercapacitor). Typically, a morphology with a high surface area is essential for a supercapacitor. In this study, spherical-shaped NiFe2O4and SiO2-NiFe2O4nanocomposites were successfully fabricated using a facile, low-cost, self-template route, and the following characterization was performed. X-ray diffractometer (XRD), Fourier-transform infrared spectrographs (FTIR), field emission scanning electron micrographs (FESEM), and diffuse reflectance spectroscopy analyses (DRS) are used to assess the physicochemical properties of SiO2-NiFe2O4nanostructures. Galvanostatic charge–discharge (GCD) and voltametric techniques (CV) were used to analyze their electrochemical behavior. The fabricated electrodes NiFe2O4and SiO2-NiFe2O4exhibited pseudocapacitive behavior due to their Faradic redox properties within the potential range from 0.0 to 0.6 V and obtained a high specific capacitance of 619 F g−1for NiFe2O4and 974 F g−1for SiO2-NiFe2O4at an applied scan rate of 10 mVs−1from CV curve. Similarly, in GCD at a current density of 1 A g−1, the specific capacitance of NiFe2O4and SiO2-NiFe2O4was 480 F g−1and 808 F g−1, respectively, with retention of 95% and 98% of capacitance even after 1000 cycles at 20 mA cm−2and with the coulombic efficiency of 87.8% for NiFe2O4and 98.4% for SiO2-NiFe2O4. Due to the high surface area of the SiO2-NiFe2O4electrode and the prompt diffusion process, the electrochemical implementation of the electrode has enhanced redox reactions. |
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