Electrochemical CO<sub>2</sub> Reduction to Multicarbon Fuels and Chemicals: Progress and Prospects of Tandem Electrolyzer Strategies.

Without any intermediate gas purification, the study circumvents the issue of residual CO 2 affecting FE in Cell-2 by assuming that, under the highly alkaline conditions present, any unreacted CO 2 will be rapidly adsorbed and precipitate as bicarbonate on the cathode surface. In reality, the presence of CO 2 in the CO stream from Cell-1 makes it impossible to accurately calculate FE in Cell-2, as the participation of CO 2 in downstream reactions disrupts standard FE calculations. However, if we set aside this complication and accept the authors’ approach, the reported results indicate a clear trend: higher CO concentration from Cell-1 leads to increased FE for C 2+ products in Cell-2 ( Figure b).

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