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Investigation of structural, morphological and electrochemical properties of mesoporous La 2 CuCoO 6 rods fabricated by facile hydrothermal route
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-07-13 , DOI: 10.1007/s12613-020-2011-6
Jashandeep Singh , Ashok Kumar

This work introduces the facile hydrothermal synthesis of double perovskite La2CuCoO6. X-ray diffraction pattern confirmed the formation of a monoclinic phase with P121/c1 symmetry. Transmission electron microscopy results revealed that the self-assembled porous rods were composed of nanocrystallite aggregates. The estimated specific surface area of these mesoporous rods with an average pore diameter of 6 nm was ∼41 m2·g−1. The presence of ions with oxidation states of La3+, Cu2+, and Co2+/Co3+ on the surface of the mesoporous La2CuCoO6 rods was confirmed by X-ray photoelectron spectroscopic analysis. Via cyclicvoltammetry and chronopotentiometry, the electrode fabricated from the mesoporous La2CuCoO6 rods were found to exhibit pseudocapacitive behavior with a specific capacitance of 259.4 F·g−1 at a current density of 0.5 A·g−1. An ∼89% retention in specific capacitance was achieved after 1000 charge/discharge cycles at a constant current density of 4 A·g−1.



中文翻译:

简便水热法制备介孔La 2 CuCoO 6棒的结构,形态和电化学性能研究

本文介绍了双钙钛矿La 2 CuCoO 6的简便水热合成。X射线衍射图证实了具有P 12 1 / c 1对称性的单斜晶相的形成。透射电子显微镜结果表明,自组装的多孔棒是由纳米微晶聚集体组成的。这些平均孔径为6nm的中孔棒的比表面积估计为〜41m 2 ·g -1。在中孔La 2表面上存在具有La 3+,Cu 2+和Co 2+ / Co 3+的氧化态的离子通过X射线光电子能谱分析确认了CuCoO 6棒。通过循环伏安法和计时电位法,发现由介孔La 2 CuCoO 6棒制成的电极在电流密度为0.5 A·g -1时具有比电容为259.4 F·g -1的拟电容行为。在以4 A·g -1的恒定电流密度进行1000次充电/放电循环后,比电容的保留率约为89%。

更新日期:2020-07-13
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