Design rGO/PEDOT composite network architectures for all-solidstatemicrosupercapacitors

摘要

Recently, microsupercapacitors as the micro-energy devices have attracted widespread attention due to their smallsize, ease of integration, high power density, fast charge/discharge rate, environmental protection, and maintenance-freefeatures. Furthermore, patterned electrode is critical to realize the fabrication of high-performance planarmicrosupercapacitors (MSCs). Herein, we describe a facile polymerization and cost-effective laser treating process formanufacturing reduced graphene oxide/poly(3,4-ethylenedioxythiophene) (rGO/PEDOT) composite networkarchitectures, which can be used for interdigitated planar symmetric MSCs. Firstly, the moderate iron(III) ptoluenesulfonatehexahydrate(Fe(PTS)3·6(H2O)) was dissolved in isopropanol to make oxidant solution under sufficientstirring. Then, the graphene oxide (GO) and EDOT monomer were successively added to the above solution underultrasonic dispersion for 4 h to form homogeneous GO/PEDOT solution at room temperature, which was deposited onpolyethylene terephthalate (PET) substrate by the spin-coating process. Followed by using laser treating process, theinsulating GO was transformed into conductive rGO after about 30 min, and the controllable interdigital rGO/PEDOTcomposite electrodes were obtained. Subsequently, the all-solid-state planar MSCs employing these interdigitatedelectrodes with PVA/H3PO4 gel electrolyte are successfully fabricated. Cyclic voltammetry and galvanostaticcharge/discharge were used to evaluate the capacitance characteristic of the obtained MSCs, which deliver high specificcapacitance of 25.7 F g~(−1), energy density of 3.57 mWh g~(−1) at 5 mW g~(−1) under the current density of 10 mA g~(−1), as wellas minor internal resistance. Their excellent capacitance is attributed to the rGO/PEDOT composite networkarchitectures.