Polyaniline, graphene/polyaniline and N-doped graphene/polyaniline hydrogels are directly synthesized through a hydrothermal process, promising for applications in high-performance flexible supercapacitors.

Employing renewable, earth-abundant, environmentally friendly, low-cost natural materials to design flexible supercapacitors (FSCs) as energy storage devices in wearable/portable electronics represents the global perspective to build sustainable and green society. Chemically stable and flexible cellulose and electroactive lignin have been employed to construct a biomass-based FSC for the first time. The FSC was assembled using lignosulfonate/single-walled carbon nanotube (Lig/SWCNT) pressure-sensitive hydrogels as electrodes and cellulose hydrogels as an electrolyte separator. The assembled biomass-based FSC shows high specific capacitance (292 F g at a current density of 0.5 A g), excellent rate capability, and an outstanding energy density of 17.1 W h kg at a power density of 324 W kg. Remarkably, the FSC presents outstanding electrochemical stability even suffering 1000 bending cycles. Such excellent flexibility, stability, and electrochemical performance enable the designed biomass-based FSCs as prominent candidates in applications of wearable electronic devices.

No abstract

No abstract

The double-network mechanical enhancement mechanism is employed for the first time to fabricate double-crosslinked network functionalized graphene/polyaniline stiff hydrogels for high-performance structural supercapacitors.