▎ 摘　　要

NOVELTY - Preparation of hydrogel flexible electrode by modifying tannic acid with graphene oxide comprises preparing graphene oxide using modified Hummer's method, dispersing powdered tannic acid in 40 mL graphene oxide solution, sonicating at room temperature for 20-60 minutes, feeding to 100 mL PTFE reactor, reacting for 12 hours, cooling, taking spongy graphene hydrogel, and pressing in current collector at 10-20 MPa. USE - Method for preparing hydrogel flexible electrode by modifying tannic acid with graphene oxide (claimed). ADVANTAGE - The preparation method is safe, low cost, and environment-friendly. The electrode has improved mechanical flexibility and excellent electrochemical performance.