High current densities during CO2 reduction in gas diffusion electrode (GDE) flow cells are incompatible with present online product-profiling methods. With the adaptation of proton-transfer reaction time-of-flight mass spectrometry, operando mechanistic information on C1–C4 product formation at copper-based GDEs is now accessible.
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The author declares no competing interests.
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Baricuatro, J.H. Mass spec live. Nat Catal 5, 1077–1078 (2022). https://doi.org/10.1038/s41929-022-00898-w