Abstract
Two-dimensional (2D) molybdenum disulfide (MoS2) nanomaterials have emerged as promising candidates for constructing excellent supercapacitors, but the lack of large-scale, efficient and low-cost methods for preparing MoS2 nanosheets severely hinders its practical application. This study demonstrates an accessible and efficient approach for electrochemical exfoliating bulk MoS2 into high-quality MoS2 nanosheets with size distribution in the range of 1–3 μm and a thickness of several nanometers in an easily available inorganic salt solution. Furthermore, we construct symmetric all-solid-state supercapacitors based on exfoliated MoS2 nanosheets. The 2D structure will provide stable channels to facilitate the intercalation/desorption of ions during charge and discharge, and to a certain extent can prevent deposition and agglomeration. Therefore, compared with the unexfoliated MoS2, as-prepared MoS2 nanosheets show great improvement in supercapacitor performance (the specific capacitance increases from the original 130 F g−1 to 215 F g−1 at 5 A g−1, for instance). In detail, the electrode possesses a specific capacitance of 285 F g−1 at a current density of 2 A g−1 and maintains the great capacitance retention of 83.8% at 8 A g−1. Moreover, the supercapacitor exhibits a high energy density of 136.8 Wh kg−1 at a power density of 2550 Wh kg−1. This work provides basic research on the preparation of 2D nanomaterials by electrochemical exfoliation.
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The data used to support the results of this study are from the corresponding authors. All data are obtained through reasonable experimental methods and all experimental data are true and valid.
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Acknowledgements
This work was supported by the Grants from Provincial Natural Science Foundation of Hunan (No. 2019JJ50612), Hunan Key Laboratory of Two-Dimensional Materials (No. 2018TP1010), Open Fund based on innovation platform of Hunan colleges and universities (No. 18K032), National Natural Science Foundation of China (No. 11504312), Scientific Research Fund of Hunan Provincial Education Department (No. 18A059), the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT_17R91) and Science and Technology Program of Xiangtan (No. CXY-ZD20172002).
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RH led the experiment, processed the data and wrote the paper; ZH analyzed the data and modified its grammar; BW and HQ conducted the experiment and discussed the results; XQ proposed the research plan and analyzed the data.
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Hu, R., Huang, Z., Wang, B. et al. Electrochemical exfoliation of molybdenum disulfide nanosheets for high-performance supercapacitors. J Mater Sci: Mater Electron 32, 7237–7248 (2021). https://doi.org/10.1007/s10854-021-05432-5
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DOI: https://doi.org/10.1007/s10854-021-05432-5