Synthesis of Z-CoS<sub>2</sub>-MoS<sub>2</sub>/rGO composite and its electrochemical lithium storage performance

doi:10.3785/j.issn.1008-973X.2022.01.017

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (1): 152-160 DOI: 10.3785/j.issn.1008-973X.2022.01.017

Synthesis of Z-CoS₂-MoS₂/rGO composite and its electrochemical lithium storage performance

Xiao-nan JIANG(

),Gang XU,Wei-xiang CHEN*(

)

Department of Chemistry, Zhejiang University, Hangzhou 310027, China

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Abstract

Dimethyl imidazole cobalt (ZIF-67) was employed as the cobalt source precursor to prepare Z-CoS₂-MoS₂/rGO (reduced graphene oxide) composite material by one-step hydrothermal method in order to develop the electrode materials for electrochemical lithium storage with high specific capacity and stable cycle performance. The microstructure and electrochemical lithium storage performance were analyzed. Results showed that the CoS₂ particles in the Z-CoS₂-MoS₂/rGO composite had a smaller and more uniform particle size compared with CoS₂-MoS₂/rGO prepared by using CoCl₂ as the cobalt source, and dispersed in MoS₂ and the surface of rGO, forming the corresponding heterostructure. The reversible specific capacity of Z-CoS₂-MoS₂/rGO can reach 1 092 mA·h/g as an electrochemical lithium storage electrode material, and maintains 941 mA·h/g at a current density of 500 mA/g after 900 cycles, demonstrating its stable cycle performance. The excellent electrochemical lithium storage performance of Z-CoS₂-MoS₂/rGO is mainly attributed to the bimetallic sulfide composite that has more redox pairs for electrochemical lithium storage and the heterostructure formed by the uniform composited of CoS₂ nanoparticles, MoS₂ nanosheets and rGO.

Key words： metal sulfide composite dimethyl imidazole cobalt CoS₂ MoS₂ electrochemical lithium storage

Received: 25 January 2021 Published: 05 January 2022

CLC:

TM 911

Fund: 国家自然科学基金资助项目(21473156)；浙江省科技计划资助项目(2015C01001)

Corresponding Authors: Wei-xiang CHEN E-mail: dd52143@qq.com;weixiangchen@zju.edu.cn

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Cite this article:

Xiao-nan JIANG,Gang XU,Wei-xiang CHEN. Synthesis of Z-CoS₂-MoS₂/rGO composite and its electrochemical lithium storage performance. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 152-160.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.01.017 OR https://www.zjujournals.com/eng/Y2022/V56/I1/152

Z-CoS₂-MoS₂/rGO的合成及电化学储锂性能

为了研发比容量高和循环性能稳定的电化学储锂电极材料，用二甲基咪唑钴(ZIF-67)作为Co源前驱体，通过一步水热法制备Z-CoS₂-MoS₂/rGO(还原氧化石墨烯)复合材料，研究微观结构和电化学储锂性能. 结果表明，与采用CoCl₂作为钴源制得的CoS₂-MoS₂/rGO相比，Z-CoS₂-MoS₂/rGO复合材料中CoS₂粒子有着更加细小和较均匀的粒径，很好地分散在MoS₂和rGO表面，形成了相应的异质结构. 作为电化学储锂电极材料，Z-CoS₂-MoS₂/rGO的可逆比容量可以达到1 092 mA·h/g，经900次循环后在500 mA/g电流密度下保持了941 mA·h/g的储锂可逆比容量，显示了稳定的充放电循环性能. Z-CoS₂-MoS₂/rGO优异的电化学储锂性能主要归因于该双金属硫化物复合材料具有较多的电化学储锂电极反应电对以及复合材料中CoS₂纳米颗粒、MoS₂纳米片和rGO之间均匀的复合及所形成的异质结构.

关键词： 金属硫化物复合材料, 二甲基咪唑钴, 二硫化钴, 二硫化钼, 电化学储锂

Fig.1 XRD patterns of different composite samples

Fig.2 SEM images of different composites

Tab.1 Atomic ratio of Co, Mo and S element in MoS₂/rGO, CoS₂-MoS₂/rGO and Z-CoS₂-MoS₂/rGO composite material

Fig.3 TGA curves of MoS₂/rGO, CoS₂-MoS₂/rGO and Z-CoS₂-MoS₂/rGO composites

Fig.4 TEM/HRTEM images of different composites

Fig.5 XPS of Z-CoS₂-MoS₂/rGO composite

Fig.6 Cyclic voltammograms for the first three cycles of electrode at scan rate of 1.0 mV/s

Fig.7 The first three charge/discharge curves of different composite electrodes at current density of 100 mA/g

Fig.8 Cycle performance of MoS₂/rGO, CoS₂-MoS₂/rGO, Z-CoS₂-MoS₂/rGO composite electrodes at current density of 100 mA/g

Fig.9 Rate capability of different composite electrodes and charge/discharge long-cyclic performance of Z-CoS₂-MoS₂/rGO electrode

Fig.10 Electrochemical impedance spectroscopy (EIS) of different composite electrodes and equivalent circuit model (CPE represents constant phase element)

Tab.2 Electrode kinetic parameters obtained by EIS fitting


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