Highly Conductive Stretchable Electrodes Prepared by In Situ Reduction of Wavy Graphene Oxide Films Coated on Elastic Tapes

A facile method is reported to prepare highly conductive stretchable wavy reduced graphene oxide (rGO) films by in situ reducing blade-coated graphene oxide films on elastic tapes. The sheet resistance of a 1.20 μm thick rGO film coated elastic tape is measured to be as low as 21 Ω sq⁻¹ and it does not change during 1000 cycles of stretching/releasing with a maximum strain of 100%. The wavy rGO film can also be detached from its elastic substrate into a freestanding state, keeping its excellent elasticity. This in situ reduction method does not involve film transfer and high-temperature annealing; thus it is convenient and scalable. A solid-state electrochemical capacitor with these rGO electrodes shows large areal specific capacitance, and excellent electrochemical stability and flexibility.