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Here, we present a bio\u2010derived, low\u2010cost, and scalable sulfonated delignified biomass hydrogel (SSH) with a salting\u2010out structured architecture that integrates solar\u2010driven interfacial evaporation and hydrovoltaic power generation. The SSH, constructed from sulfonated delignified biomass, LDH@MXene photothermal fillers, and poly(vinyl alcohol), undergoes salting\u2010out according to the Hofmeister effect to form stabilized porous channels with tunable interchannel spacing. This architecture confines heat near the air\u2013water interface and promotes directional water transport, enabling a high evaporation rate. The dense sulfonate\u2010rich anionic network and reinforced hydrogen\u2010bonding matrix facilitate efficient proton hopping, delivering an open\u2010circuit voltage of 784\u00a0mV and short\u2010circuit current of 82.14\u00a0\u00b5A. Scaled SSH arrays demonstrate stable outdoor operation and sufficient output for self\u2010powered sensing and continuous plant growth. Using trained predictive models, we estimate the annual water evaporation and hydrovoltaic performance of the SSH systems across diverse climatic conditions. This platform offers an energy\u2010efficient and broadly deployable strategy for solar\u2010driven clean water production and decentralized electricity generation, enabled by a sustainable, bio\u2010derived materials platform, suited for resource\u2010scarce regions.<\/jats:p>","DOI":"10.1002\/adma.73173","type":"journal-article","created":{"date-parts":[[2026,4,23]],"date-time":"2026-04-23T13:08:30Z","timestamp":1776949710000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Salting\u2010Out Engineered Sulfonated Cellulosic Hydrogel with Proton Hopping Pathways for Integrated Water Purification and Electricity Generation"],"prefix":"10.1002","volume":"38","author":[{"given":"Jinhyeok","family":"Kang","sequence":"first","affiliation":[{"name":"Carbon Composites Convergence Materials Engineering Jeonbuk National University  Doekgin\u2010gu Jeollabuk\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seungjae","family":"Lee","sequence":"additional","affiliation":[{"name":"Carbon Composites Convergence Materials Engineering Jeonbuk National University  Doekgin\u2010gu Jeollabuk\u2010do Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronghui","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Nanyang Technological University  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changwoo","family":"Nam","sequence":"additional","affiliation":[{"name":"Carbon Composites Convergence Materials Engineering Jeonbuk National University  Doekgin\u2010gu Jeollabuk\u2010do Republic of 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