Abstract
Aqueous supercapacitors (SCs) attracted widespread attention owing to the advantages of high power density, low-cost, safety and environmental friendliness. However, the improvement of energy density is restricted by low cell voltage. Herein, a uniform MnO2 layer-modified activated carbon cloth (ACC-MnO2) is constructed by controlling the deposited time of MnO2 via a self-limiting electroless deposition process. The targeted flexible electrode exhibits optimal areal capacitance of 423.7 mF/cm2 at 0.5 mA/cm2 and also shows excellent cycle stability ~ 81% of its original value after 10 000 cycles scanned at 100 mV/s. Moreover, the flexible quasi-solid-state asymmetric SCs (FQSASCs) are assembled based on ACC-MnO2 as a flexible positive electrode, ACC as a flexible negative electrode, and PVA-LiCl as a gel electrolyte. The FQSASCs possess an extended voltage up to 2.0 V, show extremely excellent cycle stability (maintaining over 100% capacitance retention value after 5000 cycles at 10 mA/cm2), deliver excellent energy density (0.78 mWh/cm3) and power density (71.86 mW/cm3), and also exhibit superior mechanical properties (keeping over 100% of its initial capacitance after bending at 180° for 500 cycles). FQSASCs reveal potential applications as a candidate in flexible electronic devices.
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Acknowledgements
The authors would like to acknowledge the financial support from National Natural Science Foundation of China (grant no. 22005127) and Natural Science Foundation of Gansu Province (Grant nos. 20JR10RA609, 21JR7RA465).
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Du, P., Dong, Y., Dong, Y. et al. Fabrication of uniform MnO2 layer-modified activated carbon cloth for high-performance flexible quasi-solid-state asymmetric supercapacitor. J Mater Sci 57, 3497–3512 (2022). https://doi.org/10.1007/s10853-021-06728-x
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DOI: https://doi.org/10.1007/s10853-021-06728-x