A DEMS Study of the Reduction of CO2, CO, and HCHO Pre-Adsorbed on Cu Electrodes: Empirical Inferences on the CO2RR Mechanism
The effective abatement of atmospheric carbon through its conversion via electrochemical reduction to pure and oxygenated hydrocarbon fuels relies on the ability to control product selectivity at viable current densities and faradaic efficiencies. One critical aspect is the choice of the electrode and, in the CO2-reduction electrocatalyst landscape, copper sits as the only metal known to deliver a remarkable variety of reduction products other than carbon monoxide and formic acid [1, 2, 3, 4, 5, 6, 7]. However, much better catalyst performance is needed. The overall energy efficiency of copper is less than 40 % [1, 2, 3, 4], and its nominal overvoltage at benchmark current densities remains unacceptably large at ca. 1 V. The diversity of the product distribution also becomes a major inconvenience in the likelihood that only one product is desired; unless, of course, if the selectivity window for such product is already known. Several experimental parameters influence the...
KeywordsHCHO CH3CH2OH High Activation Barrier Differential Electrochemical Mass Spectrometry Nernst Diffusion Layer
This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the US Department of Energy under Award No. DE-SC0004993.
- 1.Y. Hori, Mod Asp. Electrochem. 42, 89 (2008)Google Scholar
- 12.Y.-G. Kim, J. H. Baricuatro, A. Javier, J. M. Gregoire, M. P. Soriaga, Langmuir, In press (2014).Google Scholar
- 14.H. Baltruschat, in Interfacial electrochemistry, ed. by A. Wieckowski (Marcel Dekker, New York, 1999), p. 577Google Scholar
- 18.J. Sanabria-Chinchilla, Y.-G. Kim, X. Chen, D. Li, H. Baltruschat, M.P. Soriaga, Mod. Asp. Electrochem 44, 275 (2010)Google Scholar