在 CTAB 表面活性剂辅助下合成的 Mn3O4 阴极材料具有优异的电化学性能

IF 2.4 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2024-09-09 DOI:10.1007/s11581-024-05814-9
Yanhong Zhao, Wei Zhang, Congshuang Li, Fushun Xu
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引用次数: 0

摘要

电极材料是评价电化学电容器性能的重要指标,设计具有高比电容和优异循环稳定性能的纳米结构材料是提高超级电容器性能的重要途径。本研究以十六烷基三甲基溴化铵(CTAB)为阳离子表面活性剂,采用囊泡软模板法制备了花簇状 Mn3O4 粒子,并设定了不同浓度的 CTAB,以研究其对 Mn3O4 纳米粒子的形成和电学性能的影响。利用 XRD、SEM、TEM、BET、CV、EIS 和 GCD 等多种手段进行了物理和电化学表征。结果表明,当电流密度为 0.5 A/g 时,Mn3O4 电极材料在 1 M Na2SO4 电解液中显示出 261 F/g 的较高比电容;当电流密度增加到 10 A/g 时,比电容仍能保持在 253 F/g。在电流密度为 5 A/g 时,经过 10,000 次循环后,电容保持率极佳(高达 93%)。此外,还利用 Mn3O4 作为正极,市售活性炭(AC)作为负极,组装了 Mn3O4/AC 不对称超级电容器(ASC),该装置在 452.74 W/kg 的条件下提供了 30.56 Wh/kg 的最大能量密度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Excellent electrochemical properties of Mn3O4 cathode materials synthesized with the assistance of CTAB surfactant

Excellent electrochemical properties of Mn3O4 cathode materials synthesized with the assistance of CTAB surfactant

Electrode materials are important indicators for evaluating the performance of electrochemical capacitors, and designing nanostructured materials with high specific capacitance and excellent cycling stability performance is an important way to enhance the performance of supercapacitors. In this study, cetyltrimethylammonium bromide (CTAB) was used as a cationic surfactant, and flower cluster-like Mn3O4 particles were prepared by the vesicle soft template method, and different concentrations of CTAB were set in order to investigate its effect on the formation and electrical properties of Mn3O4 nanoparticles. Physical and electrochemical characterization was carried out using various means such as XRD, SEM, TEM, BET, CV, EIS, and GCD. The results show that the Mn3O4 electrode material exhibits a higher specific capacitance of 261 F/g in 1 M Na2SO4 electrolyte when the current density is 0.5 A/g and still maintains 253 F/g when the current density is increased to 10 A/g. Excellent capacitance retention is observed after 10,000 cycles at a current density of 5 A/g (up to 93%). In addition, a Mn3O4//AC asymmetric supercapacitor (ASC) was assembled using Mn3O4 as the positive electrode and commercially available activated carbon (AC) as the negative electrode, and the device provided a maximum energy density of 30.56 Wh/kg at 452.74 W/kg.

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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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