Laser-Induced Graphene/MoO2 Core-Shell Electrodes on Carbon Cloth for Integrated, High-Voltage, and In-Planar Microsupercapacitors

摘要

Simple and scalable manufacturing of flexible energy storage units with high electrochemical performance is essential for wearable electronic devices. Herein, a carbon cloth (CC) coated with Mo ion homo-dispersed hydrogel ink is used as a precursor for laser scribing, during which laser-induced graphene/MoO2 (LIG/MoO2) is in-situ synthesized on the substrate. By regulating the surface topography and nanoparticle distribution, the as-prepared LIG/MoO2-CC electrode shows a network structure composed of multiple core-shell fibers. Among them, the carbon-fiber core phase provides strong mechanical stability, and the in-situ growth shell of LIG/MoO2 ensures high electrochemical performance. Experimentally, the MSCs assembled by interdigital electrodes can deliver an areal capacitance of 81.8 mF cm(-2) and areal energy density of 113.7 mu Wh cm(-2) at a power density of 2.5 mW cm(-2), placing them among the best performing LIG-based MSCs. Through the series-parallel structure design of electrodes, the output voltage and total capacitance of MSCs can be adjusted according to the demands of actual applications, presenting a huge potential for integration with other wearable electronics.

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