Strong and Tough Conductive Organo‐Hydrogels via Freeze‐Casting Assisted Solution Substitution

High strength, toughness, and conductivity are among the most sought-after properties of flexible electronics. However, existing engineering materials find it difficult to achieve both excellent mechanical high conductivity. To address this challenge, study proposes a facile yet versatile strategy for preparing super-tough conductive organo-hydrogels via freeze-casting assisted solution substitution (FASS). This FASS enables formation in one step with exquisite hierarchical anisotropic structures coupled synergistic strengthening toughening effects across multiple length scales. As an exemplary material, prepared polyvinyl alcohol (PVA) organo-hydrogel solvent content up 87 wt% exhibits combination strength (6.5 MPa), stretchability (1710% strain), ultra-high toughness (58.9 MJ m−3), as well ionic 6.5 S m−1 strain sensitivity. The exceptional makes PVA promising electronics material. In addition, can also endow hydrogels multi-functions, including thermo-healability, freezing tolerance shape recoverability, be applied various hydrogel materials, such carboxymethyl cellulose, sodium alginate, chitosan. Hence, work provides all-around advanced strong tough soft multitude applications.