This work reports on the fabrication of a flexible and self-healing high-performance quasi-solid-state supercapacitor that uses a conductive composite electrode. The supercapacitor employs an active layer poly­(3,4-ethylenedioxythiophene):poly­(styrene sulfonate) (PEDOT/PSS)–multiwalled carbon nanotube (MWNT)-coated polyurethane/carbon black composite electrode sandwiched with a poly­(vinyl alcohol) (PVA)/H3PO4 gel electrolyte. The supercapacitor possesses the highest capacitance over 47 mF cm–2 and a high energy density from 5.8 to 1.7 μWh cm–2 with the corresponding power density changing from 0.13 to 0.61 W cm–2 at a current density from 1 to 8 mA cm–2. The supercapacitor can retain up to 94% of its electrochemical performance even after a fifth severing/healing cycle, and using capacitance retention, it maintains mechanical stability under various bending deformations. As a result, this self-healing supercapacitor features device-level toughness with more than 96% areal capacitance conserved, even under 180° bending (1.6 mm of bending radius). With its high durability and longevity against dynamic deformation and damage, our study demonstrates the high application potential of this supercapacitor in portable/wearable electronics.

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The electrically conductive healing polymer composites, which have the ability to recover conductivity after damage, are promising candidates as electrodes for electrical devices. In this work, a solvent casting method was used to prepare a healing conductive polymer composite of polyurethane (PU) and carbon black (CB). PU contains dynamic disulfide bonds that can undergo metathesis inducing a fast healing property. The electrical conductivity of the PU/CB composite is recovered by heating at 70°C for 1 min as a result of the synergistic effect of the hydrogen bond and disulfide metathesis. The tensile test shows complete recovery of stress but lower strain after cut and heals at 70°C for 1 h. The fast healing electrical conductivity, excellent mechanical property recovery along with easy preparation offer this PU/CB composite as a prospective candidate for optoelectronic and energy‐related devices.

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A mesoporous SiO2/Cu2O–graphene composite, a novel material, was successfully synthesized using a self-assembly method with tetraethyl orthosilicate (TEOS).