Polyacrylamide‐Graphene Oxide‐Polyaniline Based Flexible Electrode for Portable Supercapacitor.

Flexible electronics have achieved development with the rising consumption of wearable devices. In this work, a novel polyacrylamide‐graphene oxide‐polyaniline composite hydrogel (PGPH) based flexible electrode with good mechanical and electrochemical properties is prepared. The polyacrylamide interpenetrating network can provide a porous substrate. The strong π–π interaction between graphene oxide and polyaniline can stabilize polyaniline. The area‐specific capacitance of PGPH is 100.57 mF cm–2 at a current density of 5 mA cm–2, and the capacity remains at 75.54% after 1000 cycles. One layer of sodium alginate is spin‐coated on top of the electrode to solve the problem of desorption of conductive materials and improve the cycle stability of the materials. The PGPH exhibits a conductivity of 5.11 S m–1 and elongation at break of 352%, which is significantly higher than that of common polyacrylamide‐polyaniline hydrogel. Based on the good mechanical and electrochemical properties of PGPH, it has broad application prospects in flexible energy storage devices and flexible sensors. [ABSTRACT FROM AUTHOR]