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However, the main disadvantages of this method are high hydrogen evolution and low faradaic efficiencies of carbon\u2010based products. Supercritical CO<jats:sub>2<\/jats:sub> (scCO<jats:sub>2<\/jats:sub>) can be used as a solvent itself to suppresses hydrogen evolution and tune the carbon\u2010based product yield; however, it has received little attention for this purpose. Therefore, the focus of this study was on the electrochemical reduction of scCO<jats:sub>2<\/jats:sub>. The conductivity of scCO<jats:sub>2<\/jats:sub> was increased through the addition of supporting electrolyte and a cosolvent (acetonitrile). Furthermore, the addition of protic solutions of different pH to scCO<jats:sub>2<\/jats:sub> was investigated. 1\u2009<jats:sc>m<\/jats:sc> H<jats:sub>2<\/jats:sub>SO<jats:sub>4<\/jats:sub>, trifluoroethanol, H<jats:sub>2<\/jats:sub>O, KOH, and CsHCO<jats:sub>3<\/jats:sub> solutions were used to determine the effect on current density, faradaic efficiency, and selectivity of the scCO<jats:sub>2<\/jats:sub> reduction. The reduction of scCO<jats:sub>2<\/jats:sub> to methanol and ethanol are reported for the first time. However, methane and ethylene were not observed. Additionally, corrosion of the Cu electrode was noticed.<\/jats:p>","DOI":"10.1002\/cssc.201701205","type":"journal-article","created":{"date-parts":[[2017,8,7]],"date-time":"2017-08-07T05:16:34Z","timestamp":1502082994000},"page":"3660-3670","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Electrochemical Reduction of Protic Supercritical CO<sub>2<\/sub> on Copper Electrodes"],"prefix":"10.1002","volume":"10","author":[{"given":"Olga","family":"Melchaeva","sequence":"first","affiliation":[{"name":"Laboratory of Physical and Analytical Electrochemistry (LEPA) EPFL Valais Wallis  Rue de l'Industrie 17 1950 Sion Switzerland"},{"name":"Institute for Particle Technology Ruhr University Bochum  Universit\u00e4tsstra\u00dfe 150 44801 Bochum Germany"},{"name":"Fraunhofer UMSICHT  Osterfelder Str. 3 46047 Oberhausen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patrick","family":"Voyame","sequence":"additional","affiliation":[{"name":"Laboratory of Physical and Analytical Electrochemistry (LEPA) EPFL Valais Wallis  Rue de l'Industrie 17 1950 Sion Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victor Costa","family":"Bassetto","sequence":"additional","affiliation":[{"name":"Laboratory of Physical and Analytical Electrochemistry (LEPA) EPFL Valais Wallis  Rue de l'Industrie 17 1950 Sion Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Prokein","sequence":"additional","affiliation":[{"name":"Fraunhofer UMSICHT  Osterfelder Str. 3 46047 Oberhausen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manfred","family":"Renner","sequence":"additional","affiliation":[{"name":"Fraunhofer UMSICHT  Osterfelder Str. 3 46047 Oberhausen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eckhard","family":"Weidner","sequence":"additional","affiliation":[{"name":"Institute for Particle Technology Ruhr University Bochum  Universit\u00e4tsstra\u00dfe 150 44801 Bochum Germany"},{"name":"Fraunhofer UMSICHT  Osterfelder Str. 3 46047 Oberhausen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcus","family":"Petermann","sequence":"additional","affiliation":[{"name":"Institute for Particle Technology Ruhr University Bochum  Universit\u00e4tsstra\u00dfe 150 44801 Bochum Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6371-3580","authenticated-orcid":false,"given":"Alberto","family":"Battistel","sequence":"additional","affiliation":[{"name":"Laboratory of Physical and Analytical Electrochemistry (LEPA) EPFL Valais Wallis  Rue de l'Industrie 17 1950 Sion Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,9,12]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/C3CS60323G"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1201\/b20177"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp9932867"},{"key":"e_1_2_7_4_1","unstructured":"\u00a0"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0728(91)85080-9"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0728(95)03935-A"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0728(95)03917-6"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0728(95)04010-L"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2004.07.006"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1149\/1.1838179"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1149\/1.2055067"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/celc.201402373"},{"key":"e_1_2_7_13_1","unstructured":"A.Bandi C. 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