CNT and CNT-TiO 2 Coated Kapton® Sheet as Flexible Supercapacitor Electrode for Energy Storage Device

This study presents a scalable approach to fabricate the multiwalled carbon nanotube (MWCNT)/TiO2 nanocomposite coated poly imide (PI) Kapton® sheets via spray pyrolysis route for flexible electrochemical devices. The fabricated MWCNT/TiO2-polyimide (PI) Kapton® film reveals an outstanding electrochemical performance due to effective cocktail effect at MWCNT/TiO2 based electrode-electrolyte heterointerface. The MWCNT-coated polyimide (PI) Kapton® sheet-based electrode shows exceptional durability at 10 mV/s and a maximum capacitance of 414 μF/cm2. Notably, the specific capacitance rises dramatically up to 25,000 cycles at a scan rate of 30 mV/s and gradually seemed to be stable up to 35,000 cycles. The highest specific capacitance of the composite film is found to be 791 μF/cm2. These findings highlight the potential of spray pyrolysis-assisted coating for nanocomposite based flexible electrochemical system towards the application of space electronics and electrochemically stable light weight devices.