Abstract
Combining MnO2 with conductive carbon materials is an efficient approach to improve the electrical conductivity of MnO2-based electrodes, which could greatly improve the electrochemical performance of supercapacitors. Here, a ternary composite consisting of sulfonated graphene, carbon nanotubes, and manganese dioxide (SG/CNTs/MnO2) has been successfully fabricated by a facile yet efficient method. The electrochemical properties are evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. The results show a prominent improvement of electrochemical performance of MnO2-based electrodes. For instance, the specific capacitance of SG/CNTs/MnO2 composite is 336.4 F g−1 at the current density of 0.5 A g−1, which is much higher than pure MnO2 (77.1 F g−1) and binary SG/MnO2 (213.0 F g−1). Moreover, SG/CNTs/MnO2 composite shows good cycling stability with 91.3% capacitance retention after 10,000 cycles at a current density of 5 A g−1.
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Acknowledgments
FL acknowledges the support from the National Science Foundation of China (21371105), the Scientific Development Plan of Qingdao (14-2-4-41-jch) and the Natural Science Foundation of Shandong Province (ZR2018LB034).
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Li, W., Xu, H., Cui, M. et al. Synthesis of sulfonated graphene/carbon nanotubes/manganese dioxide composite with high electrochemical properties. Ionics 25, 999–1006 (2019). https://doi.org/10.1007/s11581-018-2767-0
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DOI: https://doi.org/10.1007/s11581-018-2767-0