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Engelbrecht, Andreas ; Hämmerle, Martin ; Moos, Ralf ; Fleischer, Maximilian ; Schmid, Günter:
Improvement of the selectivity of the electrochemical conversion of CO₂ to hydrocarbons using cupreous electrodes with in-situ oxidation by oxygen.
In: Electrochimica Acta.
Bd. 224
(2017)
.
- S. 642-648.
ISSN 0013-4686
DOI: https://doi.org/10.1016/j.electacta.2016.12.059
Abstract
It is still a challenge to find catalysts for the selective electrochemical reduction of CO2 to value added products. We present a new method for the in-situ modification of a copper catalyst by adding oxygen to the reactant gas. With an appropriate process procedure consisting of a sequence of electrolysis and purge steps, a Cu2O layer was formed during the purge steps. When it was reduced again during the next electrolysis step, Cu+ species remained stable on the surface and let to a higher faradaic efficiency for C2H4 formation and even a lower onset potential for CO2 reduction in general. This effect was observed for a wide range of O2 content from 10 % to 60 % in the reactant gas. In comparison to electrolysis with pure CO2, formation of methane was largely suppressed.