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This research aims to explore how varying thickness of Cu2O layers impacts CO2 reduction efficiency on Cu electrodes.

CO2 Reduction at Low Overpotential on Cu Electrodes Resulting from the Reduction of Thick Cu2O Films

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Randomized trial demonstrates improved CO2 reduction in modified Cu electrodes, suggesting their potential in catalyst development.

This research aims to explore how varying thickness of Cu2O layers impacts CO2 reduction efficiency on Cu electrodes.
Cu electrodes were modified by annealing Cu foil in air and electrochemically reducing Cu2O layers.
Activities were compared based on the initial thickness of Cu2O formed at different temperatures (130 °C and 500 °C).
Geometric current densities were measured under controlled electrochemical conditions.
Thin Cu2O layers exhibited activities similar to polycrystalline Cu, while thick layers (≥~3 μm) required 0.5 V less overpotential.
Thick Cu2O layers achieved CO2 reduction current densities >1 mA/cm2 at overpotentials <0.4 V, outperforming other metal electrodes in similar studies.
Modified electrodes maintained activity over several hours, in contrast to polycrystalline Cu which deactivated within 1 hour.

Li et al. (2012) studied this question.

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