Uniform patterning of MXene-based slurry on carbon cloth for flexible supercapacitor by roll-to-roll production

MXene is a 2D nanomaterial known for its excellent conductivity, large specific surface area, and unique physical and chemical properties, making it highly attractive for energy storage devices and various optoelectronic applications. In this study, we used a roll-to-roll process, a type of wet coating technique, to coat MXene onto a carbon cloth, producing flexible supercapacitor electrodes. The roll-to-roll production provides uniform surface coating and is highly efficient for large-scale production, significantly improving the electrodes’ electrochemical performance. We compared two approaches. The first involved applying the roll-to-roll process after fully drying, and the second involved using the roll-to-roll process before the wet slurry dried. The results showed that the timing of the roll-to-roll process significantly affected both surface uniformity and electrochemical performance. The electrode produced by using the roll-to-roll process before the wet slurry had dried exhibited a capacitance of 584.7 mF cm⁻² at 100 mV s⁻¹. On the other hand, the electrode produced by using the roll-to-roll process after the slurry had fully dried exhibited a capacitance of 784 mF cm⁻² at the same scan rate. These results provide important insights into the optimal process for producing supercapacitor electrodes using the roll-to-roll technique, thus contributing to the development of next-generation energy storage devices.