Stretchable energy storage devices composed of nanocarbon materials including reduced graphene oxide (rGO) and carbon nanotubes (CNTs)

We have incorporated nanocarbon materials such as carbon nanotubes (CNTs) or reduced graphene oxide (rGO) on to a stretchable substrates using spray coating to produce stretchable supercapacitor. The physical properties of the nanocarbon materials were characterized by FT-IR and Raman spectroscopy. The Electrochemical properties of the stretchable supercapacitor were measured by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Galvanostatic charge/discharge tests were also carried out. The impedance and charge/discharge curves of the nanocarbon based stretchable supercapacitor show good capacitive behavior even after repetitive stretching to 100% strain. The highest capacitance value obtained for the stretchable supercapacitors were 61.3 F g⁻¹ with polymer based electrolyte as a polyvinyl alcohol (PVA)/H₃PO₄. The stretchable supercapacitors retained 86% of its initial capacitance value at 100% strain.