Facile Synthesis of Polyacrylic Acid/Graphene Oxide Composite Hydrogel Electrolyte for High-Performance Flexible Supercapacitors

The development of hydrogel electrolytes plays a critical role in high-performance flexible supercapacitor devices. Herein, composite electrolyte polyacrylic acid (PAA) and graphene oxide (GO) has been successfully prepared, where the oxygen-containing functional groups GO may crosslink form hydrogen bonds with carboxyl on molecular chain PAA, thereby significantly enhancing mechanical properties PAA-based gel electrolyte. tensile strength increases from 4.0 MPa for pristine PAA to 6.1 PAA/GO gel, elongation at break rising 1556% 1950%. Meanwhile, promotes transportation ions, which are favorable ionic conductivity hydrogel. As result, assembled based shows enhanced capacitance retention 64.3% large current density 20 A g−1 excellent cycling stability over 10,000 cycles 5 g−1. Furthermore, fabricated devices could maintain outstanding electrochemical performance various bending angles 0–90°, indicating promising prospect wearable fields.