A facile green synthesis of pure nickel oxide (NiO) and Zr-doped NiO nanoparticles using aloe vera gel extract and its supercapacitors behavior

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In this work a chemical combination approach method was used to synthesized Zirconium (Zr) doped Nickel oxide (NiO) nanoparticles in five distinct compositions: 1, 3, 5, 7, and 9 W% Zr doped NiO. Physio-chemical techniques were used to characterize the synthesized materials. The XRD spectra show that the synthesized material cubic wurtzite structure with average crystallite size was 16.00 nm. The SEM images show the size is uniformly distributed and varies greatly between 50 and 80 nm. The optical energy band gap was found to be 3.41–3.71 eV. Electrochemical impedance spectroscopy (EIS), galvanostatic charge-discharge (GCD) analysis, and cyclic voltammetric (CV) experiments were used to examine the significant capacitive behavior of NiO, Zr-doped NiO nanostructures in aqueous 0.1 M HCl. Additionally, the synthesized compounds showed reversible electrochemical nature. In aqueous 0.1 M HCl, the 7 W% Zr-doped NiO electrode material demonstrated a capacitance of 436 Fg−1 at 1 Ag−1 current density by GCD tests. When there was more oxygen vacancies and surface area in the 7 W% Zr-doped NiO, it behaved stronger electrochemically than pure NiO. When compared to NiO, these results revealed that 7 W% Zr-doped NiO electrode materials is the best option for electrochemical supercapacitor applications. The aforementioned findings showed that this affordable and sustainable nanostructured material is likely to be a useful electrode material for energy storage applications.

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