Facile synthesis and electrochemical properties of sheet-rod-sheet structured NiCo2S4/EG/Ti3C2Tx nanocomposites

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2024-10-12 DOI:10.1016/j.electacta.2024.145222

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引用次数: 0

Abstract

Electrode materials with outstanding stability and electrochemical activity are ideal for high-performance supercapacitors. Herein, we developed a simple two-step method for fabricating NiCo₂S₄/EG/Ti₃C₂T_x nanocomposites with a sheet(2D)-rod(1D)-sheet(2D) structure. The NiCo₂S₄ rods were embedded into the expanded graphite (EG) sheets via an in-situ hydrothermal method, then the Ti₃C₂T_x sheets were assembled with NiCo₂S₄/EG by an electrostatic self-assembly method. The obtained NiCo₂S₄/EG/Ti₃C₂T_x nanocomposites exhibited a synergistic effect among the components. The addition of EG inhibited the volumetric effect of NiCo₂S₄ during charging and discharging processes, while the high conductivity of Ti₃C₂T_x promoted charges transfer. The rod-like structure of NiCo₂S₄ effectively inhibited the self-stacking of Ti₃C₂T_x sheets. Consequently, the optimized composite exhibited an excellent specific capacitance of 1837.9 F·g⁻¹ at a current density of 1 A·g⁻¹. Additionally, the composite electrode exhibited a capacitance retention of 73.5 % during 10,000 charging-discharging cycles at a current density of 20 A·g⁻¹.

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片状-棒状-片状结构镍钴硅酸锂/EG/Ti3C2Tx 纳米复合材料的简易合成及其电化学特性

具有出色稳定性和电化学活性的电极材料是高性能超级电容器的理想材料。在此，我们开发了一种简单的两步法，用于制备片状（2D）-棒状（1D）-片状（2D）结构的 NiCo2S4/EG/Ti3C2Tx 纳米复合材料。通过原位水热法将 NiCo2S4 棒嵌入膨胀石墨（EG）片中，然后通过静电自组装法将 Ti3C2Tx 片与 NiCo2S4/EG 组装在一起。所获得的 NiCo2S4/EG/Ti3C2Tx 纳米复合材料在各组分间表现出协同效应。EG 的加入抑制了 NiCo2S4 在充放电过程中的体积效应，而 Ti3C2Tx 的高导电性则促进了电荷转移。NiCo2S4 的棒状结构有效抑制了 Ti3C2Tx 薄片的自堆积。因此，优化后的复合材料在电流密度为 1 A-g-1 时显示出 1837.9 F-g-1 的优异比电容。此外，在 20 A-g-1 的电流密度下，复合电极在 10000 次充电-放电循环中的电容保持率为 73.5%。

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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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.