The present investigation deals with the synthesis of nickel oxide (NiO)/zinc manganite (ZnMn₂O₄) nanocomposites (NCs) by a two-step approach. The powder X-ray diffraction (PXRD) pattern revealed the existence of face-centered cubic (FCC) phase of NiO and tetragonal rutile phase structure of ZnMn₂O₄ in NiO/ZnMn₂O₄ NCs. The optical properties of NiO/ZnMn₂O₄NCs have been investigated by the UV-diffuse reflectance Spectroscopy (UV-DRS) and photoluminescence (PL) spectral analysis. The surface morphology and elemental composition of NiO/ZnMn₂O₄NCs was investigated by field emission scanning electron microscope (FESEM) and energy-dispersive X-ray spectrum (EDX) analysis. The surface area and the nature of porosity of the samples were analyzed using Brunauer–Emmett–Teller (BET) method. The electrochemical properties were investigated from the cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS) measurements. In 0.5 M potassium hydroxide (KOH) electrolyte solution, NiO/ZnMn₂O₄NCs exhibited higher specific capacitance of 886 F/g at a current density of 1Ag⁻¹ with high cyclic stability over 1000 charge–discharging cycles. Thus, the result demonstrates that the prepared NiO/ZnMn₂O₄NCs is a promising electrode material for future energy-storage devices.

本研究涉及通过两步法合成氧化镍（NiO）/锰酸锌（ZnMn ₂ O ₄）纳米复合材料（NCs）。粉末X射线衍射（PXRD）图谱表明，在NiO / ZnMn ₂ O ₄ NCs中存在NiO的面心立方（FCC）相和ZnMn ₂ O _4的四方金红石相结构。NiO / ZnMn ₂ O ₄ NCs的光学性质已通过紫外漫反射光谱（UV-DRS）和光致发光（PL）光谱分析进行了研究。NiO / ZnMn ₂ O ₄的表面形态和元素组成通过场发射扫描电子显微镜（FESEM）和能量色散X射线光谱（EDX）分析研究了NC。使用Brunauer-Emmett-Teller（BET）方法分析了样品的表面积和孔隙性质。从循环伏安法（CV），恒静电荷放电（GCD）和电化学阻抗谱（EIS）测量研究了电化学性能。在0.5 M氢氧化钾（KOH）电解质溶液中，NiO / ZnMn ₂ O ₄ NC在1Ag ^-1的电流密度下表现出更高的比电容886 F / g，在1000次充放电循环中具有较高的循环稳定性。因此，结果表明制备的NiO / ZnMn ₂ O ₄NCs是用于未来储能设备的有希望的电极材料。