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Study of double perovskite La 2 B(II)MnO 6 (B: Ni, Co, Cu) as electrode materials for energy storage
Journal of Solid State Electrochemistry ( IF 2.6 ) Pub Date : 2020-02-05 , DOI: 10.1007/s10008-020-04511-7
Marcela A. Bavio , Julia E. Tasca , Gerardo G. Acosta , Marcelo F. Ponce , Rodolfo O. Fuentes , Arnaldo Visintin

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.



中文翻译:

双钙钛矿La 2 B(II)MnO 6(B:Ni,Co,Cu)作为储能电极材料的研究

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。

更新日期:2020-02-05
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