Spinel nickel ferrite (NiFe2O4) materials synthesized via spray-pyrolysis for electrochemical supercapacitor application
Vidyadevi D. Patil, Ashwini Patil, Amar L. Jadhav, Sharad L. Jadhav, Anamika V. Kadam, Sunita R. Dandwate, Bhaurao R. Shinde
Abstract
To explore potential applications of NiFe 2 O 4 -based supercapacitors in various energy storage systems, including portable electronic devices, electric vehicles, and grid energy storage, highlighting the advantages and challenges of using NiFe 2 O 4 in these applications. To identify and propose future research directions for further improving the performance of NiFe 2 O 4 supercapacitors. In the study focuses on optimizing concentration of synthesis to achieve desirable structural and electrochemical properties, characterizing the synthesized materials, and assessing their specific capacitance, energy density, power density, cycle stability, and rate capability. The different molar precursor solutions were utilized for the formation of NiFe 2 O 4 thin films by using the cost-effective spray pyrolysis technique. The impact of different molarities on the structural, morphological, elemental, optical, and charge storage performance of NiFe 2 O 4 thin films has been studied. In the XRD studies identified the cubic crystalline structure with Fd-3 m space group symmetry of NiFe 2 O 4 . The FE-SEM shows the grain-like surface morphology of NiFe 2 O 4 thin films. The EDAX study reveals that NiFe 2 O 4 thin films were stoichiometric. Bandgap energy values of the thin films were observed in the range of 1.97 to 2.2 eV with allowed direct band gap transitions. The maximum specific capacitance for NiFe 2 O 4 thin film was found to be 707 Fg −1 at 2 mVs −1 with the wider potential window of − 0.8 to + 1 .6 V in 1 M KOH aqueous electrolyte. GCD study confirms the pseudocapacitive behavior of NiFe 2 O 4 thin films. The maximum specific energy and specific power were found to be 83.88 WhKg −1 and 5.294 KWkg −1 at a current density of 0.002 Ag −1 . Such as spinel ferrite NiFe 2 O 4 thin film electrodes as an excellent candidate material for electrochemical supercapacitor applications.