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Herein, we report the synthesis of [AuCu\n                    <jats:sub>24<\/jats:sub>\n                    (dppp)\n                    <jats:sub>6<\/jats:sub>\n                    H\n                    <jats:sub>22<\/jats:sub>\n                    ]\n                    <jats:sup>+<\/jats:sup>\n                    , a copper hydride nanocluster bearing exposed Cu\n                    <jats:sub>3<\/jats:sub>\n                    H\n                    <jats:sub>3<\/jats:sub>\n                    units in specific surface cavities, and our use of it to study the mechansim and selectivity of the reduction of CO\n                    <jats:sub>2<\/jats:sub>\n                    to C\n                    <jats:sub>2+<\/jats:sub>\n                    products. Results of in situ infrared spectroscopy and theoretical calculations showed that these Cu\n                    <jats:sub>3<\/jats:sub>\n                    H\n                    <jats:sub>3<\/jats:sub>\n                    units can effectively lower the energy barrier to the formation of the *COCOH intermediate, which allowed the competition between the C\n                    <jats:sub>1<\/jats:sub>\n                    and C\n                    <jats:sub>2<\/jats:sub>\n                    pathways to be elucidated. Isotope labeling experiments and catalyst recrystallization studies corroborated the theoretical simulations, identifying the lattice\u2010hydrogen (H\n                    <jats:sup>\u2212<\/jats:sup>\n                    ) in the Cu\n                    <jats:sub>3<\/jats:sub>\n                    H\n                    <jats:sub>3<\/jats:sub>\n                    active unit as being indispensable for the formation of C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    . The molecular design guidelines which this work has facilitated constitute a new approach towards the of copper\u2010based catalysts that convert CO\n                    <jats:sub>2<\/jats:sub>\n                    to C\n                    <jats:sub>2+<\/jats:sub>\n                    products based on lattice\u2010hydrogen engineering.\n                  <\/jats:p>","DOI":"10.1002\/anie.202500191","type":"journal-article","created":{"date-parts":[[2025,2,12]],"date-time":"2025-02-12T22:37:06Z","timestamp":1739399826000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Atomic\u2010Level Elucidation of Lattice\u2010Hydrogens in Copper Catalysts for Selective CO\n                    <sub>2<\/sub>\n                    Electrochemical Conversion toward C\n                    <sub>2<\/sub>\n                    Products"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1959-4668","authenticated-orcid":false,"given":"Xiaoshuang","family":"Ma","sequence":"first","affiliation":[{"name":"College of Chemistry and Molecular Engineering Qingdao University of Science and Technology  Qingdao 266042 P.\u2005R. China"},{"name":"College of Materials Science and Engineering Qingdao University of Science and Technology  Qingdao 266042 P.\u2005R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cong","family":"Fang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences  Qingdao 266101 P.\u2005R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mei","family":"Ding","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Qingdao University of Science and Technology  Qingdao 266042 P.\u2005R. 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China"},{"name":"College of Materials Science and Engineering Qingdao University of Science and Technology  Qingdao 266042 P.\u2005R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,17]]},"reference":[{"key":"e_1_2_7_1_1","unstructured":"\u00a0"},{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.8b00705"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41560-019-0450-y"},{"key":"e_1_2_7_4_1","unstructured":"\u00a0"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1039\/f19898502309"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1039\/c39880000017"},{"key":"e_1_2_7_7_1","unstructured":"\u00a0"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms12123"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.2012649118"},{"key":"e_1_2_7_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202405733"},{"key":"e_1_2_7_11_1","unstructured":"\u00a0"},{"key":"e_1_2_7_12_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201910155"},{"key":"e_1_2_7_13_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-020-16998-9"},{"key":"e_1_2_7_14_2","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201804867"},{"key":"e_1_2_7_15_1","unstructured":"\u00a0"},{"key":"e_1_2_7_16_2","volume":"9","author":"Wang 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