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Recently, microsupercapacitors as the micro-energy devices have attracted widespread attention due to their small size, ease of integration, high power density, fast charge/discharge rate, environmental protection, and maintenance-free features. Furthermore, patterned electrode is critical to realize the fabrication of high-performance planar microsupercapacitors (MSCs). Herein, we describe a facile polymerization and cost-effective laser treating process for manufacturing reduced graphene oxide/poly(3,4-ethylenedioxythiophene) (rGO/PEDOT) composite network architectures, 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 sufficient stirring. Then, the graphene oxide (GO) and EDOT monomer were successively added to the above solution under ultrasonic dispersion for 4 h to form homogeneous GO/PEDOT solution at room temperature, which was deposited on polyethylene terephthalate (PET) substrate by the spin-coating process. Followed by using laser treating process, the insulating GO was transformed into conductive rGO after about 30 min, and the controllable interdigital rGO/PEDOT composite electrodes were obtained. Subsequently, the all-solid-state planar MSCs employing these interdigitated electrodes with PVA/H3PO4 gel electrolyte are successfully fabricated. Cyclic voltammetry and galvanostatic charge/discharge were used to evaluate the capacitance characteristic of the obtained MSCs, which deliver high specific capacitance 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 well as minor internal resistance. Their excellent capacitance is attributed to the rGO/PEDOT composite network architectures.
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