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While\n                    <jats:italic>m<\/jats:italic>\n                    Cu\n                    <jats:sub>x<\/jats:sub>\n                    O synthesized via colloidal templating produces mostly C\n                    <jats:sub>1<\/jats:sub>\n                    products, the introduction of one or two atomic monolayer equivalents of Pd nanoclusters via cluster beam deposition induces a pronounced selectivity shift toward ethylene and ethanol. Following Pd deposition, the C\n                    <jats:sub>2+<\/jats:sub>\n                    faradaic efficiency of Pd\u2010modified\n                    <jats:italic>m<\/jats:italic>\n                    Cu\n                    <jats:sub>x<\/jats:sub>\n                    O\u00a0increases nearly sixfold compared to bare\n                    <jats:italic>m<\/jats:italic>\n                    Cu\n                    <jats:sub>x<\/jats:sub>\n                    O at a current density of 100\u2009mA\u2009cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . A combination of ex\u2009situ X\u2010ray diffraction, X\u2010ray Photoelectron Spectroscopy, Extended X\u2010ray absorption fine structure, High\u2010energy\u2010resolution fluorescence\u2010detected X\u2010ray absorption near edge structure, and in\u2009situ Raman spectroscopy reveals that at these low Pd loadings, the nanoclusters promote the complete reduction at \u22120.7 V\n                    <jats:sub>RHE<\/jats:sub>\n                    \u00a0(versus the reversible hydrogen electrode) of\n                    <jats:italic>m<\/jats:italic>\n                    Cu\n                    <jats:sub>x<\/jats:sub>\n                    O into small Cu metal crystallites that are likely important for the significant C\n                    <jats:sub>2+<\/jats:sub>\n                    selectivity enhancement. In situ Raman indicates that once the\n                    <jats:italic>m<\/jats:italic>\n                    Cu\n                    <jats:sub>x<\/jats:sub>\n                    O is reduced, a small amount of Pd nanoclusters promotes the increase in surface\u2010bound *CO and *CH\n                    <jats:sub>x<\/jats:sub>\n                    specieson. In contrast, higher Pd nanocluster loadings only yield a partial reduction of\n                    <jats:italic>m<\/jats:italic>\n                    Cu\n                    <jats:sub>x<\/jats:sub>\n                    O, even at \u22121.0 V\n                    <jats:sub>RHE<\/jats:sub>\n                    , accompanied by a decrease in C\n                    <jats:sub>2+<\/jats:sub>\n                    selectivity.\n                  <\/jats:p>","DOI":"10.1002\/cssc.202501482","type":"journal-article","created":{"date-parts":[[2025,9,22]],"date-time":"2025-09-22T15:40:02Z","timestamp":1758555602000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Palladium Nanocluster Modification of Mesoporous Copper Oxide Shifts Its Selectivity to C\n                    <sub>2+<\/sub>\n                    Products in CO\n                    <sub>2<\/sub>\n                    Electrochemical 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