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Description
The W$_{18}$O$_{49}$ nanostructures assembled on carbon felt electrodes (WNAC) were fabricated using a simple solvothermal method. We report the effect of surface modification of Carbon felt (CF) and morphology of nanostructure on supercapacitor performance. The CF was pre-treated with HNO3 to form oxygen-containing groups on the surface. The pretreatment of CF promotes the uniform distribution of W$_{18}$O$_{49}$ nanostructures on the surface of CF. In the synthesis process, the morphological, structural, and electrochemical properties of nanostructures were controlled by the synthesis time and pH. The grown nanostructures of synthesis time at 12 h with HCl insertion showed the greatest performance. The specific capacitance was 311.71 F/g at a scan rate of 20 mV/s, and the charge-transfer resistance was 1.2 Ω in the three-electrode system. This is attributed that the high specific surface area due to the thin thickness contributing to the low charge-transfer resistance and easy accessibility of electrolytes of WNAC.
