Investigating the role of potassium cations during electrochemical CO2 reduction
S. Chandrashekar (TU Delft - ChemE/Materials for Energy Conversion and Storage)
H.P. Iglesias van Montfort (TU Delft - ChemE/Materials for Energy Conversion and Storage)
Divya Bohra (TU Delft - ChemE/Materials for Energy Conversion and Storage)
G.A. Filonenko (TU Delft - ChemE/Inorganic Systems Engineering)
JJC Geerlings (TU Delft - ChemE/Materials for Energy Conversion and Storage)
T.E. Burdyny (TU Delft - ChemE/Materials for Energy Conversion and Storage)
Wilson Smith (TU Delft - ChemE/Materials for Energy Conversion and Storage)
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Abstract
The specific identity of electrolyte cations has many implications in various electrochemical reactions. However, the exact mechanism by which cations affect electrochemical reactions is not agreed upon in the literature. In this report, we investigate the role of cations during the electrochemical reduction of CO2 by chelating the cations with cryptands, to change the interaction of the cations with the components of the electric double layer. As previously reported we do see the apparent suppression of CO2 reduction in the absence of cations. However, using in situ-SEIRAS we see that CO2 reduction does indeed take place albeit at very reduced scales. We also observe that cations play a role in tuning the absorption strengths of not only CO2 as has been speculated, but also that of reaction products such as CO.