Salting‐Out Engineered Sulfonated Cellulosic Hydrogel with Proton Hopping Pathways for Integrated Water Purification and Electricity Generation

Interfacial solar evaporators capable of cogenerating clean water and electricity offer a promising solution to the water-energy nexus, yet large-scale implementation remains limited by expensive materials and energy-intensive fabrication. Here, we present a bio-derived, low-cost, and scalable sulfonated delignified biomass hydrogel (SSH) with a salting-out structured architecture that integrates solar-driven interfacial evaporation and hydrovoltaic power generation. The SSH, constructed from su