基于 La2FeMnO6 双包晶石的电化学超级电容器的制备、磁性能、性能及其储能机理研究

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Advanced Powder Technology Pub Date : 2024-08-10 DOI:10.1016/j.apt.2024.104618
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引用次数: 0

摘要

近年来,具有多功能特性的 La2FeMnO6 双包晶石引起了人们的关注。然而,目前还没有直接研究阐述其在超级电容器应用中的电化学特性。本文采用溶胶-凝胶法合成了 La2FeMnO6 双包晶石,并测定了它们的结构、形态、振动、光学、磁学和电化学性能。X 射线衍射和里特维尔德细化结果表明其结构为立方体,空间群为 Pm-3m,从其扫描电镜图像中可以观察到其随机分布的准球形形态。Fe2+-O2--Fe3+ 和 Mn3+-O2--Mn4+ 之间形成的双交换相互作用支持了 La2FeMnO6 中 Mn 和 Fe 的多种氧化态。根据 BET 分析估算,介孔结构的比表面积为 41.79813 m2/g。采用三电极设置测定了 La2FeMnO6 的电化学特性,其循环伏安曲线呈准矩形,在 0.5 mA g-1 的电流密度下,比电容约为 10.9 mF g-1。邓恩方法说明了电极的电荷存储机制,并确定在低扫描速率下,扩散控制过程超过了电容过程。循环稳定性表明,即使经过 5000 次循环,仍能保持 96% 的初始比电容,这意味着 La2FeMnO6 双包晶石具有长期稳定性和实用性。磁性分析表明,该系统中存在铁磁性和反铁磁性相互作用,而且都是短程性质的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Study on preparation, magnetic properties and performance of electrochemical supercapacitor based on La2FeMnO6 double perovskite for energy storage applications and their charge storage mechanism

La2FeMnO6 double perovskites with multifunctional properties have sparked attention in recent years. Nevertheless, there was no direct study elaborating its electrochemical properties for supercapacitor applications. Herein, La2FeMnO6 double perovskites were synthesized by the sol–gel method and their structural, morphological, vibrational, optical, magnetic, and electrochemical properties were determined. The X-ray diffraction along with Rietveld refinement showed a cubic structure with Pm-3m space group, and its randomly distributed quasi-spherical morphology was observed from its SEM image. The presence of multiple oxidation states of Mn and Fe in La2FeMnO6 was supported by the formation of double exchange interactions between Fe2+-O2−-Fe3+ and Mn3+-O2−-Mn4+. The mesoporous structure with 41.79813 m2/g surface area was estimated from the BET analysis. The electrochemical properties of La2FeMnO6 were determined using the three electrode setup, and the Cyclic Voltammetric curves possess a quasi-rectangular shape with a specific capacitance of about 10.9 mF g−1 at a current density of 0.5 mA g−1. Dunn’s method illustrate the electrode’s charge storage mechanism and it was determined that the diffusion-controlled process surpasses the capacitive processes at low scan rates. The cyclic stability demonstrated that 96 % of initial specific capacitance was retained even after 5000 cycles which implied the long-term stability and practical use of La2FeMnO6 double perovskites. The magnetic analysis showed the presence of ferromagnetic and anti-ferromagnetic interactions both in this system and they are short-range in nature.

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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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