多孔NiMoO4/NiCo2S4 复合材料的制备及其电化学性能

doi:10.19799/j.cnki.2095-4239.2022.0671

摘要/Abstract

摘要：

超级电容器因其功率密度高、充放电迅速、循环寿命长等优点被认为是一种极具发展前景的新型储能装置，其中电极材料的研究是超级电容器发展的关键，材料的微观结构很大程度上决定了材料的电化学性能。本工作采用水热法及热处理制备了NiMoO₄/NiCo₂S₄复合材料，并应用于超级电容器电极。对纳米复合材料的组成及微观结构通过X-射线衍射(XRD)、能量色散X-射线能谱仪(EDS)、X-射线光电子射线能谱仪(XPS)、扫描电子显微镜(SEM)和氮气吸脱附法进行表征，结果表明复合材料具有多孔三维网状结构，其独特的结构减少了NiMoO₄的团聚，增加了材料比表面积，展现出更加优异的电化学性能：在1 A/g的电流密度下，比电容为847.2 F/g(高于NiMoO₄电极的576.1 F/g和NiCo₂S₄电极的734.3 F/g)，即使在10 A/g的电流密度下仍保留466.7 F/g的比电容。当NiMoO₄/NiCo₂S₄复合材料作为正极、活性炭作为负极构成非对称超级电容器时，在1 A/g的电流密度下循环2000圈后，仍保留76%的比电容，具有良好的循环稳定性。本研究对NiMoO₄作为超级电容器电极材料的发展提供参考，为高比电容、高循环稳定性电极材料的研发提供实验依据。

关键词: 超级电容器, 钼酸镍, NiCo₂S₄, 复合材料

Abstract:

Supercapacitors are a new type of energy storage device that have great development prospects owing to their higher power density, rapid charging and discharging, long cycle life, and other advantages. Research on electrode materials can lead to the development of supercapacitors, in which the microstructure of materials largely determines their electrochemical performance. In this study, NiMoO₄/NiCo₂S₄ composite was prepared using hydrothermal method and heat treatment and then applied to supercapacitor electrodes. The composition and microstructure of nanocomposites were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and N₂ adsorption and desorption. The prepared product shows excellent electrochemical performance: the specific capacitance was 847.2 F/g (higher than 576.1 F/g of NiMoO₄ electrode and 734.3 F/g of NiCo₂S₄ electrode) at a current density of 1 A/g, and 466.7 F/g at a high current density of 10 A/g. When NiMoO₄/NiCo₂S₄ composite material was used as the positive electrode and the active carbon as the negative electrode to form an asymmetric supercapacitor, the device retained 76% of the initial capacitance after 2000 cycles at a current density of 1 A/g, proving its excellent cycle stability. Thus, the present work can provide a reference for the development of NiMoO₄ as an electrode material for supercapacitors and serve as an experimental basis for the research of electrode materials with high specific capacitance and high cycle stability.

Key words: supercapacitor, NiMoO₄, NiCo₂S₄, composite

中图分类号:

TB 33

王跃迪, 仇中柱, 吴渺, 朱燕艳, 屈蒙. 多孔NiMoO₄/NiCo₂S₄ 复合材料的制备及其电化学性能[J]. 储能科学与技术, 2023, 12(4): 1034-1044.

Yuedi WANG, Zhongzhu QIU, Miao WU, Yanyan ZHU, Meng QU. Preparation and electrochemical properties of porous NiMoO₄/NiCo₂S₄ composites[J]. Energy Storage Science and Technology, 2023, 12(4): 1034-1044.

图/表 7

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参考文献 30

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多孔NiMoO₄/NiCo₂S₄ 复合材料的制备及其电化学性能

Preparation and electrochemical properties of porous NiMoO₄/NiCo₂S₄ composites

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