Fabrication and Capacitance Performance of Laser-machined RGO/MWCNT/CF In-plane Flexible Micro-supercapacitor

Micro and flexible supercapacitors are promising energy storage devices that were prerequisite in smart-garment system. However, the electrochemical performance of micro-supercapacitor is lower than that of batteries. Herein, RGO/MWCNT/CF micro-supercapacitor was prepared via laser-machining of graphene oxide (GO) and multi-walled carbon nanotubes (MWCNT) on the cotton fabric (CF). The GO was reduced and MWCNT was fixed on the graphene layer when the laser sculptured the in-plane pattern on the cotton fabric. This nanomaterial shows high electrical conductivity (7. 19 x 10(4) S/m), attributed to the combined nanomaterials increasing the integrality of the conducting network. The best monolithic supercapacitor exhibited an area capacitance of 24 mF/cm(2) in PVA-LiCl electrolyte (PVA = polyvinyl alcohol). The energy density attained 1.22 mW . h/kg and the power density reached 61 mW . h/kg. Micro-supercapacitors exhibited remarkably high mechanical flexibility and showed a good cycling stability, with 92% retention of the specific capacity after 1000 cycles.