▎ 摘　　要

In this study, we report polyaniline (PANI)-modified oriented graphene hydrogel (OGH) films as the freestanding electrode for flexible solid-state supercapacitors (SCs). The OGH films are prepared by a facile filtration method using chemically converted graphene sheets and then introduced to PANT on the surface of OGH films by in situ chemical polymerization. The PANT-modified OGH films possess high flexibility, high electrical conductivity, and mechanical robustness. The flexible solid-state SCs based on the PANT-modified OGH films exhibit a specific capacitance of 530 F/g, keeping 80% of its original value up to 10 000 charge-discharge cycles at the current density of 10 A/g. Remarkably, the flexible solid-state SCs maintain similar to 100% capacitance retention bent at 180 for 250 cycles. Moreover, the flexible solid-state SCs are further demonstrated to be able to light up a red-light-emitting diode. These results indicate that the flexible solid-state SCs based on PANT-modified OGH films as the free-standing electrode have potential applications as energy-storage devices.