Boosting nickel nanoferrite’s specific capacitance with Azadirachta Indica for advanced supercapacitors

• Published in: Inorganic chemistry communications Vol. 170; p. 113265
• Main Authors: Rathod, Mansi Sopan, Mehere, Arati Chandragupta, Kadam, Pallavi Baliram, Gaikwad, Satish Vitthal, Jagadale, Sandip Kisan, Rathod, Sopan Mansing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2024
• Subjects: Azadirachta Indica; Nickel nano ferrite; Spinel; Supercapacitor; VSM; XRD; FCC; W–H; XRD; PVDF; SRM; Azadirachta Indica; NPs; NMP; VSM; CV; Spinel; DDW; FTIR; EDLC; FWHM; Supercapacitor; Nickel nano ferrite
• ISSN: 1387-7003
• DOI: 10.1016/j.inoche.2024.113265

The novelty of the present work is reduced the crystallite size remarkably and boosted specific capacitance synthesized by Azadirachta Indica extract. [Display omitted] •The present research work is not reported previously.•Nickel Ferrite (NiFe2O4) is synthesized in Azadirachta Indica extract.•prepared by a sol-gel auto-combustion method. The crystallite size remarkably reduced from 28.09 nm to 16.23 nm.•The magnetic saturation increases and the coercivity curve shifts towards zero during the reverse magnetic field.•The specific capacitance of the Nickel Ferrite electrode synthesized using Azadirachta Indica extract was boosted.•The novelty of the present work is reduced the crystallite size remarkably and boosted specific capacitance synthesized by Azadirachta Indica extract. Nickel Ferrite (NiFe2O4) a valuable transition metal oxide possessing a spinel structure, it is extensively utilized in industry due to its compelling properties. In this present study the sol–gel auto-combustion synthesis method was employed using nitrates and citric acid in conjunction with double distilled water (DDW) and Azadirachta Indica extract. The X-ray diffraction (XRD) analysis revealed the formation of a cubic spinel phase with high crystallinity. Crystallite size of prepared Nickel Ferrite in double distilled water and Azadirachta Indica by Scherrer’s equation and Williamson–Hall plot (W–H) are 28.09 nm and 33.01 nm as well as 16.23 nm and 16.55 nm, with microstrains of 0.32739 % and 0.339 × 10−3 % respectively. The notable reduction in the crystallite size is observed when employing Azadirachta Indica compared to the double distilled water-based synthesis. The X-ray density of the synthesized sample in double distilled water and Azadirachta Indica are obtained as 3.935 (g cm−3) and 5.427 (g cm−3). Transmission electron microscopy (TEM) of Azadirachta Indica-based nanostructured Nickel Ferrite material exhibited a particle size of 17.06 nm. The study encompassed the calculation of various parameters such as hopping lengths, polaron radius, specific surface area, packing fraction, and dislocation density. Magnetic parameters are comprehensively examined using a vibrating sample magnetometer (VSM), revealing a Bohr magneton is 3.278. The shifting of coercivity curve observed towards right due to exchange bias effect and the unidirectional anisotropy for diamagnetic Azadirachta Indica based Nickel ferrite. Optical properties are investigated through UV–VIS and Fourier-transform infrared (FTIR) spectroscopy, resulting in a band gap energy of 1.75 eV and a porosity is 11.16 %. Electrochemical evaluation of Nickel Ferrite electrodes is conducted over a potential range from 0.0 to 1 V. The specific capacitance of Nickel Ferrite electrodes synthesized with double distilled water and Azadirachta Indica are determined as 511.9 F/g and 695 F/g respectively, at a scan rate of 50 mV/s, as evaluated through cyclic voltammetry (CV) measurements in Ag/AgCl (0.1 M NaOH as electrolyte). The specific capacitance of Nickel Ferrite, produced with double distilled water and Azadirachta Indica extract, is 686 F/g and 817.398 F/g respectively, as determined by Galvanostatic charge–discharge (GCD) measurements. The study conclusively demonstrated significantly improvement in the electrochemical performance of Nickel Ferrite, synthesized with Azadirachta Indica extract for supercapacitor application. Based on GCD and CV, the specific capacitance has been boosted significantly with Azadirachta Indica extract for supercapacitor application.