Sodium alginate-based high conductive, ultra-stretchable hydrogel fibers for electrolytes of flexible solid-state supercapacitors

The flexibility and safety of energy storage systems are crucial, and hydrogels as one of the most promising candidates for solid-state electrolytes. We present a conductive hydrogel based on sodium alginate that exhibits ultra-stretchable (4200 %) and high conductivity (16.3 S m