The Central Role of Bicarbonate in the Electrochemical Reduction of Carbon Dioxide on Gold

Much effort has been devoted in the development of efficient catalysts for electrochemical reduction of CO2. Molecular level understanding of electrode-mediated process, particularly the role of bicarbonate in increasing CO2 reduction rates, is still lacking due to the difficulty of directly probing the electrochemical interface. We developed a protocol to observe normally invisible reaction intermediates with a surface enhanced spectroscopy by applying square-wave potential profiles. Further, we demonstrate that bicarbonate, through equilibrium exchange with dissolved CO2, rather than the supplied CO2, is the primary source of carbon in the CO formed at the Au electrode by a combination of in situ…

• UD
  U.S. Department of Energy

  Award: DE-FG02-13ER16381
• DO
  Division of Chemical, Bioengineering, Environmental, and Transport Systems

  Award: CBET-1350911
• DO
  Division of Chemistry

  Award: CHE-1566138