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However, the photocatalytic activity and C\n                    <jats:sub>2+<\/jats:sub>\n                    selectivity of current copper oxide\u2010based heterojunctions remain insufficient for practical applications, largely due to inefficient interfacial charge transport and limited C\u2500C coupling efficiency. Herein, we report a 0D\/1D CuO\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    \/ZnO\u2010A400 photocatalyst featuring dual\u2010coherent Cu\n                    <jats:sub>2<\/jats:sub>\n                    O\/CuO\/ZnO heterointerfaces with cascade built\u2010in electric fields to realize a photocatalytic C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    evolution rate of 12.7\n                    <jats:italic>\u00b5<\/jats:italic>\n                    mol h\n                    <jats:sup>\u22121<\/jats:sup>\n                    (5 mg of catalyst) with a selectivity of 44.1%. Advanced electron microscopy combined with density functional theory calculations reveals the formation of atomically coherent Cu\n                    <jats:sub>2<\/jats:sub>\n                    O\/CuO and CuO\/ZnO interfaces. The directionally aligned BIEFs across the interfaces, pointing from Cu\n                    <jats:sub>2<\/jats:sub>\n                    O to CuO and from CuO to ZnO, establish a cascade charge\u2010transfer pathway that accelerates the separation and migration of photogenerated carriers, thereby promoting the C\u2500C coupling of CO\n                    <jats:sub>2<\/jats:sub>\n                    molecules. This work provides an effective strategy for atomic\u2010scale interface engineering in multicomponent heterojunctions and offers new insights into the design of efficient photocatalytic systems for selective CO\n                    <jats:sub>2<\/jats:sub>\n                    conversion into value\u2010added multicarbon products.\n                  <\/jats:p>","DOI":"10.1002\/smll.75893","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T15:02:00Z","timestamp":1790175720000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Constructing Cascade Built\u2010In Electric Fields via Dual\u2010Epitaxial Heterointerfaces for Photocatalytic CO\n                    <sub>2<\/sub>\n                    \u2010to\u2010C\n                    <sub>2<\/sub>\n                    H\n                    <sub>4<\/sub>\n                    Conversion"],"prefix":"10.1002","author":[{"given":"Mingyue","family":"Wang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"},{"name":"State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Shen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"},{"name":"State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuaidan","family":"Gu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"},{"name":"State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaocong","family":"Liang","sequence":"additional","affiliation":[{"name":"College of Chemistry and Material Science Shandong Agriculture University  Taian Shandong People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-4329-6557","authenticated-orcid":false,"given":"Sikang","family":"Xue","sequence":"additional","affiliation":[{"name":"Institutes of Physical Science and Information Technology Anhui University  Hefei People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyang","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"},{"name":"State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9913-488X","authenticated-orcid":false,"given":"Guigang","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"},{"name":"State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry Fuzhou University  Fuzhou People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2656-9169","authenticated-orcid":false,"given":"Sibo","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key 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