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Here, we introduce a dry\u2010wet interface engineering strategy that enables persistent thermal\u2010ionic coupling for continuous electricity generation. Inspired by leaf transpiration, an asymmetric Janus nanofiber membrane is constructed to form a stable hydrophilic\u2010hydrophobic interface that simultaneously regulates fluid distribution and interfacial charge dynamics. This architecturally confined interface induces hydration\u2010triggered surface ionization on the hydrophilic layer, generating an intrinsic potential difference continuously reinforced by evaporation\u2010driven directional ion transport. As a result, the Janus evaporator delivers a stable open\u2010circuit voltage of 0.22\u00a0V under 1 sun illumination, 57% higher than natural evaporation, and exhibits scalable output up to 2.21\u00a0V via modular integration. Mechanistic investigations combining experiments and multiscale simulations reveal that the sustained electrical output arises from the synergistic coupling of interfacial potential modulation, ion\u2010selective transport, and localized photothermal heating. The dry\u2010wet interface plays a decisive role by stabilizing charge separation and suppressing potential dissipation. This work establishes a general framework for interfacial potential engineering in evaporation\u2010driven systems, enabling simultaneous solar desalination and electricity generation.<\/jats:p>","DOI":"10.1002\/advs.77250","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T12:29:20Z","timestamp":1786969760000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Thermal\u2010Ionic Coupling in Transpiration\u2010Inspired Janus Nanofiber Membranes: Synergistic Dry\u2010Wet Interface Engineering for Solar\u2010Driven Electricity Generation"],"prefix":"10.1002","author":[{"given":"Qin","family":"Su","sequence":"first","affiliation":[{"name":"School of Chemistry and Materials Yangzhou University  Yangzhou Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haidi","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Chemistry and Materials Yangzhou University  Yangzhou Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tingting","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Chemistry and Materials Yangzhou University  Yangzhou Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Di","family":"He","sequence":"additional","affiliation":[{"name":"School of Chemistry and Materials Yangzhou University  Yangzhou Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huaiguo","family":"Xue","sequence":"additional","affiliation":[{"name":"School of Chemistry and Materials Yangzhou University  Yangzhou Jiangsu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2382-8850","authenticated-orcid":false,"given":"Longcheng","family":"Tang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Organosilicon Chemistry and Material Technology of MoE College of Material Chemistry and Chemical Engineering Hangzhou Normal University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5646-4627","authenticated-orcid":false,"given":"Yongqian","family":"Shi","sequence":"additional","affiliation":[{"name":"College of Environment and Safety Engineering Fuzhou University  Fuzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9714-1242","authenticated-orcid":false,"given":"Xuejun","family":"Lai","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Key Laboratory of Guangdong Province for High Property and Functional Polymer Materials South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6038-9770","authenticated-orcid":false,"given":"Jiefeng","family":"Gao","sequence":"additional","affiliation":[{"name":"School of 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