In this paper, the study of the potential capacity of energy storage in supercapacitors containing oxide La₂B(II)MnO₆ (with B = Cu, Co, Ni) as the electrode material is presented. The mixed oxides are prepared by route of citrate precursors, starting from the nitrates of the corresponding metallic cations. The samples were calcined at 800 °C. The material was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The electrochemical characterization was performed through cyclic voltammetry (CV), galvanostatic charge/discharge measurements (GCD) and electrochemical impedance spectroscopy (EIS) in a three-electrode cell at room temperature, using a platinum electrode and a hydrogen electrode as counter and reference electrodes, respectively. The working electrode was prepared by a dispersion of the nanocomposite and carbon black in an isopropanol solution added on glassy carbon and covered by a Nafion® thin film. Runs were carried out in 0.05-–0.95-V range in 0.5 M KOH solution. The cyclic voltamperograms were obtained at varying the scan rates from 10 to 100 mV s⁻¹. The galvanostatic charge/discharge curves were realize at current density values in the 0.625–31.25 A g⁻¹ range. The higher capacitance values were obtained for La₂CuMnO₆. Thus, a specific capacitance of 781.25 F g⁻¹at a current density of 3.12 A g⁻¹, and a power and an energy specific of 72.6 kW kg⁻¹ and 113.4 Wh kg⁻¹, were obtained.

本文研究了含氧化物La ₂ B（II）MnO _6的超级电容器的潜在储能能力（B = Cu，Co，Ni）作为电极材料。从相应金属阳离子的硝酸盐开始，通过柠檬酸盐前体的途径制备混合氧化物。样品在800°C下煅烧。通过扫描电子显微镜（SEM），X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对材料进行了表征。在室温下，使用铂电极和氢电极作为对电极和参比电极，通过循环伏安法（CV），恒电流充电/放电测量（GCD）和电化学阻抗谱（EIS）在三电极电池中进行电化学表征， 分别。通过将纳米复合材料和炭黑分散在添加到玻璃碳上并被Nafion®薄膜覆盖的异丙醇溶液中来制备工作电极。在0.5 M KOH溶液中于0.05-0.95-V范围内进行运行。在10到100 mV s的扫描速率下获得循环伏安图^-1。恒电流充放电曲线是在电流密度值在0.625–31.25 A g ^-1范围内实现的。对于La ₂ CuMnO ₆可以获得更高的电容值。因此，781.25 F G的特定电容^-1在3.12 g的电流密度^-1 72.6千瓦千克的能量特异性的，和一个电源和^-1和113.4千克瓦^-1，获得。