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However, the role of specific electronic trap states that govern charge carrier dynamics remains incompletely understood. Herein, we report a lanthanide\u2010assisted solid\u2010state strategy to synthesize Sm\n                    <jats:sup>3+<\/jats:sup>\n                    \u2010doped CeO\n                    <jats:sub>2<\/jats:sub>\n                    that selectively suppresses detrimental Ce\n                    <jats:sup>3+<\/jats:sup>\n                    4f\n                    <jats:sup>1<\/jats:sup>\n                    trap states while preserving surface active sites. Structural and spectroscopic characterizations indicate that Sm\n                    <jats:sup>3+<\/jats:sup>\n                    preferentially segregates at the CeO\n                    <jats:sub>2<\/jats:sub>\n                    surface, where its incorporation suppresses Ce\n                    <jats:sup>3+<\/jats:sup>\n                    4f\n                    <jats:sup>1<\/jats:sup>\n                    trap states that act as dominant non\u2010radiative recombination centers, thereby prolonging charge carrier lifetimes and enabling efficient migration to the catalytic surface. When integrated with dual cocatalysts (CoO\n                    <jats:sub>x<\/jats:sub>\n                    \u2013Rh\/Cr\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    ), the optimized Sm\n                    <jats:sup>3+<\/jats:sup>\n                    \u2010doped CeO\n                    <jats:sub>2<\/jats:sub>\n                    achieves an apparent quantum yield of 12.6%\u00a0\u00b1\u00a00.4% at 365\u00a0nm, representing the highest reported value for CeO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010based photocatalysts for overall water splitting. These findings establish surface lanthanide segregation as a versatile approach for regulating defect states and charge carrier dynamics, unlocking the intrinsic activity of CeO\n                    <jats:sub>2<\/jats:sub>\n                    for solar\u2010fuel production.\n                  <\/jats:p>","DOI":"10.1002\/anie.5141626","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:00:19Z","timestamp":1790654419000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sm\n                    <sup>3+<\/sup>\n                    Doping\u2010Induced Suppression of Ce\n                    <sup>3+<\/sup>\n                    4f\n                    <sup>1<\/sup>\n                    Trap States in CeO\n                    <sub>2<\/sub>\n                    for Efficient Photocatalytic Overall Water Splitting"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-2092-4624","authenticated-orcid":false,"given":"Guirong","family":"Zou","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University  Fuzhou Fujian P. 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