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Herein, a dual organic\u2010inorganic encapsulation strategy is developed to construct water\u2010resistant CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    nanocrystals. Hydrophobic zwitterionic ligands, in combination with an epitaxial CsPb\n                    <jats:sub>2<\/jats:sub>\n                    Br\n                    <jats:sub>5<\/jats:sub>\n                    shell, effectively isolate the CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    core from water while maintaining structural integrity. To overcome the carrier\u2010blocking effect induced by encapsulation, hollow CoS\n                    <jats:sub>x<\/jats:sub>\n                    is introduced to form a sandwich\u2010like heterostructure, in which CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    is spatially confined between CoS\n                    <jats:sub>x<\/jats:sub>\n                    and CsPb\n                    <jats:sub>2<\/jats:sub>\n                    Br\n                    <jats:sub>5<\/jats:sub>\n                    . This architecture enables directional charge transfer via a Schottky CoS\n                    <jats:sub>x<\/jats:sub>\n                    \/CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    interface for efficient electron extraction and a type\u2010II CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    @CsPb\n                    <jats:sub>2<\/jats:sub>\n                    Br\n                    <jats:sub>5<\/jats:sub>\n                    heterojunction for hole transport. Benefiting from the synergistic stabilization and charge\u2010management effects, the resulting photocatalyst achieves a hydrogen evolution rate of 5.36\u00a0mmol h\n                    <jats:sup>\u22121<\/jats:sup>\n                    g\n                    <jats:sup>\u22121<\/jats:sup>\n                    with an apparent quantum efficiency of 4.19% at 420\u00a0nm, while maintaining stable performance over five cycles. This work provides a general strategy for integrating multi\u2010layer encapsulation with carrier\u2010selective interfaces to realize durable and efficient perovskite photocatalysts for aqueous hydrogen evolution.\n                  <\/jats:p>","DOI":"10.1002\/smll.74707","type":"journal-article","created":{"date-parts":[[2026,7,26]],"date-time":"2026-07-26T03:50:32Z","timestamp":1785037832000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dual Organic\u2010Inorganic Encapsulation and Ternary Heterojunction Engineering Toward Water\u2010Resistant CsPbBr\n                    <sub>3<\/sub>\n                    Perovskite Photocatalysts for Hydrogen Production"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0046-8407","authenticated-orcid":false,"given":"Chun","family":"Sun","sequence":"first","affiliation":[{"name":"School of Electronics and Information Engineering Tianjin Key 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