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The formation of ethylene and ethanol on these surfaces generally increased as the electrolyte anion was changed from ClO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u2192Cl\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u2192Br\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u2192I\n                    <jats:sup>\u2212<\/jats:sup>\n                    . For example, on Cu(100) at \u22121.23\u2005V versus RHE, as the electrolyte anion changed from ClO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    to I\n                    <jats:sup>\u2212<\/jats:sup>\n                    , the faradaic efficiency (FE) of ethylene formation increased from 31 to 50\u2009%, FE\n                    <jats:sub>ethanol<\/jats:sub>\n                    increased from 7 to 16\u2009%, and the associated current densities increased five\u2010 and sevenfold, respectively. A remarkable total FE of up to 74\u2009% for C\n                    <jats:sub>2<\/jats:sub>\n                    and C\n                    <jats:sub>3<\/jats:sub>\n                    products was obtained in the presence of KI. Despite surface roughening in the presence of the electrolytes, the Cu(100) electrode still enhanced the formation of C\n                    <jats:sub>2<\/jats:sub>\n                    compounds better than Cu(111). The favorable reduction of CO\n                    <jats:sub>2<\/jats:sub>\n                    to C\n                    <jats:sub>2<\/jats:sub>\n                    products in KI electrolyte was correlated with a higher *CO population on the surface, as shown using linear sweep voltammetry. In\u2005situ Raman spectroscopy indicated that the coordination environment of *CO was altered by the used electrolyte anion. Thus, apart from affecting the morphology of the electrode and local pH value, we propose that the anion plays a critical role in enhancing the formation of C\n                    <jats:sub>2<\/jats:sub>\n                    products by tuning the coordination environment of adsorbed *CO, which gives rise to more efficient C\u2212C coupling.\n                  <\/jats:p>","DOI":"10.1002\/cssc.201801078","type":"journal-article","created":{"date-parts":[[2018,6,26]],"date-time":"2018-06-26T00:22:10Z","timestamp":1529972530000},"page":"3299-3306","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":171,"title":["Effects of Electrolyte Anions on the Reduction of Carbon Dioxide to Ethylene and Ethanol on Copper (100) and (111) 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