Laser‐Induced Graphene/MoO<sub>2</sub> Core‐Shell Electrodes on Carbon Cloth for Integrated, High‐Voltage, and In‐Planar Microsupercapacitors
Na Lin, Hanning Chen, Wentao Wang, Longsheng Lu
Abstract
Abstract 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/MoO 2 (LIG/MoO 2 ) is in‐situ synthesized on the substrate. By regulating the surface topography and nanoparticle distribution, the as‐prepared LIG/MoO 2 ‐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/MoO 2 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 μWh 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.