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However, achieving a controllable dopant distribution within a single\u2010particle photocatalyst without compromising its well\u2010defined redox facets remains a significant challenge. Here, using a two\u2010step molten\u2010salt synthesis as a controlled platform, we reveal facet\u2010selective Al\n                    <jats:sup>3+<\/jats:sup>\n                    incorporation in SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    while preserving the desired cuboctahedron morphology with exposed {100}\/{111} facets. Increasing the Al\n                    <jats:sup>3+<\/jats:sup>\n                    supply within this morphology\u2010preserving window leads to a pronounced facet\u2010anisotropic distribution within individual particles, with the Al content along {111} exceeding that along {100} by more than twofold from the surface toward the bulk. This facet\u2010anisotropic distribution enhances the inter\u2010facet electrostatic asymmetry associated with the intrinsic built\u2010in electric field. As a demonstration, 4.0 mol% Al\u2010doped SrTiO\n                    <jats:sub>3<\/jats:sub>\n                    delivers an apparent quantum yield of 81.1% at 335\u00a0nm for overall water splitting, producing H\n                    <jats:sub>2<\/jats:sub>\n                    and O\n                    <jats:sub>2<\/jats:sub>\n                    in a stoichiometric 2:1 ratio with a hydrogen evolution rate of 3364.13 \u00b5mol\u00b7h\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This work establishes facet\u2010resolved dopant distribution as a spatial design parameter for efficient particulate photocatalysis.\n                  <\/jats:p>","DOI":"10.1002\/adma.75171","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T06:47:40Z","timestamp":1790750860000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Anisotropic Facet Doping Amplifies Built\u2010In Electric Field in Single\u2010Particle Photocatalysts"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3396-1859","authenticated-orcid":false,"given":"Peng Cheng","family":"Ding","sequence":"first","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6376-6519","authenticated-orcid":false,"given":"Zhi\u2010Hao","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing Computational Science Research Center  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0741-9210","authenticated-orcid":false,"given":"Wenbo","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Centre School of Chemistry and Molecular Engineering East China University of Science &amp; Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meng Min","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao Yang","family":"Lin","sequence":"additional","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4788-0028","authenticated-orcid":false,"given":"Jun","family":"Kang","sequence":"additional","affiliation":[{"name":"Beijing Computational Science Research Center  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0411-0488","authenticated-orcid":false,"given":"Peng Fei","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science and Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3424-9253","authenticated-orcid":false,"given":"Xie","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Northwestern Polytechnical University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5787-0179","authenticated-orcid":false,"given":"Sheng","family":"Dai","sequence":"additional","affiliation":[{"name":"Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Centre School of Chemistry and Molecular Engineering East China University of Science &amp; Technology  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0436-8622","authenticated-orcid":false,"given":"Hua Gui","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering East China University of Science and Technology  Shanghai 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