High‐Performance Dual‐Network Wood‐Based Ionic Conductive Hydrogel for Supercapacitors and Sensitive Sensors

Abstract

The lignocellulosic skeleton is obtained through delignification and alkali treatment, which not only preserves the inherent anisotropy of wood but also introduces naturally occurring ion channels. The resulting cellulose skeleton is integrated with a poly(vinyl alcohol)/polyacrylamide double network to fabricate a wood‐derived double‐network hydrogel. To ensure ionic conductivity while maintaining excellent mechanical properties, a sodium sulfate ion solution and glycerol were incorporated into the system, achieving a conductivity of up to 2.20 S m −1 , a tensile strength of 2.06 MPa, and a tensile strain of 13.6%. This wood‐based conductive hydrogel is employed as an electrolyte in supercapacitors. The specific capacitance values of the supercapacitor at different scan rates. Furthermore, this hydrogel can be used to fabricate flexible sensors. Such sensors exhibit stable periodic signals under different bending angles, and are particularly stable and sensitive at a 60° bend, making them suitable for simulating dynamic movements. This study leverages the hierarchical porosity of wood and a dual‐network design to develop a mechanically robust and conductive hydrogel. The material holds great potential for applications in energy storage and flexible electronic devices, offering a promising strategy for the development of high‐performance systems.