B-Site-Substituted Rhombohedral LaMnO3 Nanoparticle-Decorated Electrodes for Stable 2 V Aqueous Symmetric Supercapacitors

IF 5.5 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Manju V., Rohith R., Anandhu Thejas Prasannakumar and Sreekanth J. Varma*, 
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Abstract

The material properties, symmetry, and structural properties of ABO3-type perovskite oxides are strongly influenced by the nature of A- and B-site cations. The electrochemical properties of this material can be tuned by the partial substitution in either the A-site or the B-site. The ionic radii and valence states of these cations are critical factors in optimizing the performance of perovskites. In this work, the electrochemical activity of rhombohedral LaMnO3 is improved by substituting cobalt for manganese at the B-site. Various levels of Co substitution (25, 50, and 75%) are carried out and optimized using a sol–gel method. Among the different electrodes fabricated using these samples, LMC 25 (LaMn0.75Co0.25O3) shows the best performance, which is attributed to the synergistic effects and improved electronic as well as ionic conductivities of the sample. This electrode exhibits a specific capacitance of 85 F g–1 at a current density of 1 A g–1. A symmetric device is also fabricated with the LMC 25 electrodes, which is operated in a potential window of 2 V. The device is found to exhibit a capacitance of 37 F g–1 at a current density of 0.5 A g–1 and delivers an energy density of 20.5 Wh kg–1 at a power density of 1 kW kg–1. High capacitance retention of 92% even after 20000 charge–discharge cycles and the ability to deliver an appreciable energy density of 10 Wh kg–1 even at a high power density of 10 kW kg–1 highlight the potential of these electrodes in efficient energy storage applications with long cycle life.

Abstract Image

b位取代菱形LaMnO3纳米粒子修饰电极用于稳定的2v水对称超级电容器
abo3型钙钛矿氧化物的材料性质、对称性和结构性质受到A和b位阳离子性质的强烈影响。该材料的电化学性能可以通过a位或b位的部分取代来调整。这些阳离子的离子半径和价态是优化钙钛矿性能的关键因素。在这项工作中,通过在b位取代钴来提高菱面体LaMnO3的电化学活性。不同水平的Co取代(25,50和75%)进行和优化使用溶胶-凝胶法。在使用这些样品制备的不同电极中,LMC 25 (LaMn0.75Co0.25O3)表现出最好的性能,这是由于协同效应和提高了样品的电子和离子电导率。该电极在电流密度为1 a g-1时的比电容为85 F g-1。用LMC - 25电极制作了一个对称器件,该器件在2 V的电位窗口中工作。该器件在0.5 a g-1电流密度下的电容为37 F - 1,在1 kW kg-1功率密度下的能量密度为20.5 Wh kg-1。即使在20000次充放电循环后也能保持92%的高电容,并且即使在10 kW kg-1的高功率密度下也能提供10 Wh kg-1的可观能量密度,这突出了这些电极在具有长循环寿命的高效储能应用中的潜力。
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来源期刊
CiteScore
8.30
自引率
3.40%
发文量
1601
期刊介绍: ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.
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