▎ 摘　　要

A simple and template-free method for the fabrication of modified pulp fiber (PF)-polyacrylamide (PAM)-graphene (RGO) composite electrodes was developed. The pulp fiber-graphene electrodes decorated with polyacrylamide were synthesized via a facile vacuum-filtration process, and further optimized through different mass ratios. Benefiting from the porous structure and large amounts of hydrophilic groups in the paper fiber, the PF-PAM-RGO composite electrode demonstrated good hydrophilic property and ion transport capacity within the electrode. After adding the polyacrylamide molecule (PF-RGO), the PF-PAM-RGO composite electrode exhibited good mechanical properties and capacitance performance due to PF-RGO hydrogen bonding. Moreover, the PF-PAM-RGO composite electrode displayed a high area specific capacitance of 498.4 mF cm(-2) with a mass of 2.32 mg cm(-2) (specific capacitance of 214.8 F g(-1)) at 0.2 mA cm(-2). The assembled PF-PAM-RGO composite electrode showed a good cycling stability (92.36% capacitance retention after 8000 charging/discharging cycles) and mechanical flexibility (87.65% capacitance retention after 500 bending/unbending cycles). Remarkably, the flexible device could achieve superior energy density of 80.59 Wh cm(-2) and high power density of 2549.83 W cm(-2).