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

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/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 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.

Simple fabrication of Co3O4 nanoparticles on N-doped laser-induced graphene for high-performance supercapacitors

“… 33 However, the energy density obtained in the present work is smaller than the previously reported LIG/MoO 2 core–shell electrode on carbon cloth. 34 …”

“…33 However, the energy density obtained in the present work is smaller than the previously reported LIG/ MoO 2 core-shell electrode on carbon cloth. 34 In order to meet the practical requirements for the voltage and specic energy, three Co 3 O 4 -NLIG-SCs were connected in series and their CV and GCD measurements were recorded at 50 mV s À1 and 0.5 mA cm À2 , respectively (Fig. 6a and b).…”

High Mass Loading Asymmetric Micro-supercapacitors with Ultrahigh Areal Energy and Power Density

“…The MSCs delivered energy densities as high as 627.8 μWh·cm –2 at a power density of 0.5 mW·cm –2 and 400.3 μWh·cm –2 at a very high power density of 64 W·cm –2 . Values as high as 627.8 μWh·cm –2 are records of micro-supercapacitors. ,,,,,,− Additionally, a high volumetric energy density of 12.56 mWh·cm –3 was obtained at a volumetric power density of 8.98 mW·cm –3 , which is higher than most of the high mass loading supercapacitors reported previously (Figure S14). Finally, the device retained 86.9% of its initial capacitance after 5000 cycles (Figure f), while Coulombic efficiencies during cycling were always >95%, further corroborating the picture of highly reversible electrochemical reactions.…”

Laser Processing of Flexible In-Plane Micro-supercapacitors: Progresses in Advanced Manufacturing of Nanostructured Electrodes

“…In this case, laser processing featured with rapid heating and cooling could create unusual reaction conditions, which would be conducive to directly retain the structural defects in the final hybrid nanomaterial on flexible substrates. For example, laser irradiation of carbon precursors/GO composites containing transition metal ions in air enables the generation of TMSO-decorated LIG ,− or LrGO − films in one-step due to the involvement of oxygen and/or water. As such, laser oxidation methods are widely utilized to manufacture high-performance flexible electrodes for in-plane MSCs. ,,− In 2015, Hwang et al proposed a facile method of laser irradiation of GO composites containing ruthenium trichloride (RuCl 3 ) in air to fabricate and pattern interdigital electrodes based on RuO 2 /LrGO nanocomposites.…”