Electrodeposited binder-free Cu-Mn-S nanosheets for high-performance asymmetric supercapacitor devices

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Yanqin Xu, Wucui Ren, Hong Wu, Yu Song, Chengyong Huang, Menghao Liu, Biemin Sun, Min Liu, Changguo Chen, Xueming Li
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Abstract

In this study, three-dimensional interconnected nanosheet-like binder-free Cu-Mn-S@NF composites were efficiently fabricated on nickel foam by one-step electrochemical deposition and optimized for metal ion deposition concentration to improve the problem of electrochemical performance degradation due to volume expansion of supercapacitor electrode materials. Owing to the unique structure that provides many active sites and a stable skeleton structure that fully promotes the diffusion of ions from the electrolyte into the electrode material, the three-dimensional interconnected nanosheet Cu-Mn-S@NF electrode material exhibits excellent electrochemical properties, and the structure prevents agglomeration and volume expansion during charge/discharge cycles, alleviating active material shedding. Under the three-electrode system, Cu-Mn-S@NF exhibits excellent electrochemical performance with a high specific capacitance of 2468.8 F g−1 at a current density of 2 A g−1, and it still maintains a specific capacitance of 1940 F g−1 at a high specific capacitance of 10 A g−1, with a multiplier performance of 78.58%. The assembled Cu-Mn-S@NF//AC HSC can obtain a maximum specific capacitance of 153.1 F g−1 (1 A g−1), an energy density as high as 54.47 Wh kg−1 at a power density of 800 W kg−1, and 70.23% capacitance retention after 6000 cycles.

Abstract Image

电沉积无粘结剂铜锰硒纳米片用于高性能不对称超级电容器设备
本研究通过一步电化学沉积法在泡沫镍上高效制备了三维互联纳米片状无粘结剂 Cu-Mn-S@NF复合材料,并对金属离子沉积浓度进行了优化,以改善超级电容器电极材料因体积膨胀而导致电化学性能下降的问题。由于独特的结构提供了许多活性位点,稳定的骨架结构充分促进了电解液中离子向电极材料的扩散,三维互连纳米片Cu-Mn-S@NF电极材料表现出优异的电化学性能,而且该结构可防止充放电循环过程中的团聚和体积膨胀,减轻活性材料的脱落。在三电极系统下,Cu-Mn-S@NF 表现出优异的电化学性能,在电流密度为 2 A g-1 时,比电容高达 2468.8 F g-1;在 10 A g-1 的高比电容下,比电容仍能保持在 1940 F g-1,倍增性能高达 78.58%。组装后的 Cu-Mn-S@NF//AC HSC 可获得 153.1 F g-1 (1 A g-1)的最大比电容,在功率密度为 800 W kg-1 时,能量密度高达 54.47 Wh kg-1,6000 次循环后的电容保持率为 70.23%。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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