MgCo<sub>2</sub>O<sub>4</sub>海胆状电极材料的制备及其电化学性能

doi:10.11868/j.issn.1001-4381.2020.001187

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摘要

采用水热法制得一种尖晶石型MgCo₂O₄海胆状电极材料，并通过X射线衍射(XRD)、X射线光电子能谱分析(XPS)、扫描电镜(SEM)、透射电镜(TEM)以及电化学工作站对产物进行了表征和电化学性能测试。通过改变所制备材料的水热反应时间，制备出团簇结构、分布较均匀以及密集度较高的MgCo₂O₄海胆状形貌。结果表明，当水热反应时间为6 h时所获得的MgCo₂O₄电极材料结构较为完善、尺寸较为均匀、电化学性能较为优异，而且在电流密度为1 mA/cm²情况下，面积比电容高达6.75 F/cm²。另外，对该MgCo₂O₄海胆状材料在20 mA/cm²的电流密度下循环1000周次后，面积比电容保持为原来的88.4%，表现出良好的循环性能。

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	倪航
	刘万能
	柯尊洁
	田玉
	朱小龙
	郑广

关键词 ：水热法, 海胆状MgCo₂O₄, 面积比电容, 循环稳定性

Abstract：

A spinel type of urchin-like MgCo₂O₄ electrode material was obtained by facile hydrothermal method. The products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and electrochemical performance of the products was tested by electrochemical workstation measurements. By changing the hydrothermal reaction time, cluster structure, uniform distribution, together with high density of urchin-like MgCo₂O₄ material can be synthesized. The results show that as the hydrothermal reaction time reaches 6 h, the structure of MgCo₂O₄ electrode material is relatively perfect, its size is more uniform, and the electrochemical performance is better. Furthermore, at a current density of 1 mA/cm², area specific capacitance reaches up to 6.75 F/cm². Additionally, the specific capacitance is maintained at 88.4% after 1000 cycles at the current density of 20 mA/cm², showing good cycle performance.

Key words： hydrothermal route urchin-like MgCo₂O₄ area specific capacitance cycle stability

收稿日期: 2020-12-23 出版日期: 2022-08-16

中图分类号:	TB383
	TG115.21⁺5.3

基金资助:江汉大学校级科研项目(2021yb021)

通讯作者: 田玉 E-mail: ytian@jhun.edu.cn

作者简介: 田玉(1979—)，女，副教授，博士，研究方向为半导体材料与器件，联系地址：湖北省武汉市沌口经济技术开发区江汉大学J05楼(430056)，E-mail: ytian@jhun.edu.cn

引用本文:

倪航, 刘万能, 柯尊洁, 田玉, 朱小龙, 郑广. MgCo₂O₄海胆状电极材料的制备及其电化学性能[J]. 材料工程, 2022, 50(8): 143-152.
Hang NI, Wanneng LIU, Zunjie KE, Yu TIAN, Xiaolong ZHU, Guang ZHENG. Preparation and electrochemical properties of urchin-like MgCo₂O₄ electrode material. Journal of Materials Engineering, 2022, 50(8): 143-152.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.001187 或 http://jme.biam.ac.cn/CN/Y2022/V50/I8/143

Fig.1 海胆状MgCo₂O₄合成过程示意图

Fig.2 不同时间下合成的MgCo₂O₄晶体的XRD图谱(a)和MgCo₂O₄单位晶胞(b)

Fig.3 MCO-6样品的XPS谱图
(a)全谱图；(b)Mg1s；(c)Co2p；(d)O1s

Fig.4 MCO-6表面形貌图
(a)~(c)纳米针SEM图；(d)部分海胆状结构的TEM图, 插图为SAED图; (e)单根纳米针的TEM图；(f)HRTEM图

Fig.5 不同反应时间合成的海胆状MgCo₂O₄SEM图
(a)~(c)MCO-5；(d)~(f)MCO-8

Fig.6 MgCo₂O₄海胆状材料的形貌随反应时间变化示意图

Fig.7 MgCo₂O₄海胆状电极材料的电化学性能曲线
(a)所有样品在扫描速率5 mV/s下的CV曲线；(b)所有样品在1 mA/cm²下的GCD曲线；(c)MCO-6在不同扫描速率下的CV曲线；(d)MCO-6在不同电流密度下的GCD曲线；(e)MCO-6的倍率性能图；(f)所有样品的EIS谱；(g)MCO-6循环性能图；(h)MCO-6循环前后EIS谱

Table 1 MCO-6样品与早期文献报道钴基材料的电化学性能数据对比

Fig.8 MCO-6可能的电子传输示意图
(a)长在泡沫镍上的海胆状MgCo₂O₄结构；(b)浸入电解液中长在泡沫镍上的海胆状MgCo₂O₄结构；(c)电解液中海胆状MgCo₂O₄结构与OH^-接触方式；(d)海胆状MgCo₂O₄材料可能的电子运输路径

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