Abstract
A fabrication strategy involving the electrostatic self-assembly of positively charged molybdenum disulfide (MoS2) nanosheets and negatively charged graphene oxide (GO) sheets and thermal reduction process is proposed to prepare MoS2/graphene hybrid films. The incorporation of MoS2 nanosheets embedded in graphene sheets serves as spacers, preventing the graphene sheets from restacking. The optimized free-standing MoS2/graphene hybrid film (MoS2/G-2) demonstrates a remarkable areal specific capacitance of 979 mF cm−2 at 1 mA cm−2, which is 2.85 times as much as pure reduced graphene oxide (rGO) (343 mF cm−2). Benefiting from the layer-layer self-assembly structure and good synergistic effect, MoS2/G-2 electrode exhibits enhanced capacitive performance with excellent cycling stability and no capacitance attenuation after 3000 cycles. Furthermore, by utilizing MoS2/G-2 as electrode material for the assembled symmetric supercapacitors (MoS2/G-2//MoS2/G-2), a superior areal energy density of 20 μWh cm−2 at the areal power density of 600 μW cm−2 is achieved. The prepared hybrid film materials hold immense potential in constructing high-performance film electrode for electrochemical energy storage.
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Acknowledgements
This work was supported by the Key Scientific Research Project in Colleges and Universities of Henan Province of China (No. 22B430024) and the Science and Technology Development Program of Henan province of China (No. 222102320057).
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Du, X., Liu, S., Zhou, Y. et al. Electrostatic self-assembly of MoS2/graphene hybrid films for energy storage in high-performance symmetric supercapacitor. Ionics (2024). https://doi.org/10.1007/s11581-024-05544-y
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DOI: https://doi.org/10.1007/s11581-024-05544-y