Self‐Standing Hydrogels Composed of Conducting Polymers for All‐Hydrogel‐State Supercapacitors

Abstract Conducting polymer hydrogels that are capable of contacting with electrolytes at the molecular level, represent an important electrode material. However, the fabrication of self‐standing hydrogels merely composed of conducting polymers is still challenging owing to the absence of reliable methods. Herein, a novel and facile macromolecular interaction assisted route is reported to fabricate self‐standing hydrogels consisting of polyaniline (PANi: providing high electrochemical activity) and poly(3,4‐ethylenedioxythiophene) (PEDOT: enabling high electronic conductivity). Owing to the synergistic effect between them, the self‐standing hydrogels possess good mechanical properties and electronic/electrochemical performances, making them an excellent potential electrode for solid‐state energy storage devices. A proof‐of‐concept all‐hydrogel‐state supercapacitor is fabricated, which exhibits a high areal capacitance of 808.2 mF cm −2 , and a high energy density of 0.63 mWh cm −3 at high power density of 28.42 mW cm −3 , superior to many recently reported conducting polymer hydrogels based supercapacitors. This study demonstrates a novel promising strategy to fabricate self‐standing conducting polymer hydrogels.