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Abstract
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Herein, based on transition metals and 1, 3, 5-benzene tricarboxylic acid organic linker, three MOF electrodes, including Cd-BTC, CdNi-BTC, and CdNiCo-BTC, are fabricated through a one-pot and in-situ hydrothermal method. The CdNiCo-BTC is used as a cathode electrode for asymmetric supercapacitors. Whereas using MXene, reduced graphene oxide, and ZnO nanoparticles, the nanocomposite electrodes of MXene/rGO, rGO/ZnO, and MXene/rGO/ZnO are constructed and utilized as an anode material. Besides conventional physico-chemical characterization, to investigate the effect of surface morphological features, texture, and periodicity on the electrochemical performance of the electrodes, frequency spectrum, fractal dimensions, and various surface statistical parameters are studied using atomic force microscopy analysis. At optimum electrolytes, MXene/rGo/ ZnO and CdNiCo-BTC electrodes provide the specific capacitances of 378.12 and 1258.40 Fg-1 at 1 Ag-1, respectively. Also after 10000 cycles of galvanostatic charge-discharge at 20 Ag-1 retain 92.44 % and 95.75 % of their initial capacitances, respectively. Accordingly, three asymmetric hybrid supercapacitors, including MXene/rGO//CdNiCo-MOF, rGO/ZnO//CdNiCo-BTC, and MXene/rGO/ZnO//CdNiCo-BTC are fabricated. The MXene/ rGO/ZnO//CdNiCo-BTC AHSC offered an excellent specific capacitance of 143.77 Fg-1, energy density of 39.13 Wh kg1, and power density of 729.26 W kg1 at 1 Ag-1 with an excellent cycle stability of 94.09 % after 10000 cycles.
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