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The use of primary amino groups as receptors to detect CO2 is promising because of their ability to perform reversible acid-base-reactions. In contrast to other sensitive materials using this effect, evaluable signals can be obtained even at ambient temperature. The effect discussed for most of the previously used sensing layers is the formation of bicarbonate species, which needs H2O as well as an increased temperature. The use of primary amino groups and work function readout appears to be dominated by another reaction, the reversible formation of carbamate, which does not require any water presence and, in addition to that, is more efficient at lower temperatures. To confirm this hypothesis, IR-, Raman-, XPS- and NMR-spectroscopy were used

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The electrochemical reduction reaction of CO2 (CO2RR) is a promising avenue toward the renewable energy‐driven transformation of a greenhouse gas toward fuels and value‐added chemicals. While copper uniquely can catalyze this reaction to longer carbon chains, Cu‐based electrodes continue to face numerous challenges, including low selectivity toward desired products and poor stability. To unlock its potential for large‐scale industrial implementation, great interest is shown in tackling these challenges, primarily focusing on catalyst and electrode modifications and thereby leaving a research gap in the effects of operation conditions. Herein, back pressure application is introduced in CO2 electrolyzers at industrially relevant current densities (200 mA cm−2) in order to steer selectivity toward C2+ products. The back pressure adjusts CO2 availability at the electrode surface, with a high CO2 surface coverage achieved at ΔP = 130 mbar suppressing the competing hydrogen evolving reaction for 72 h and doubling of stable ethylene production duration. Faradaic efficiency of 60% for C2+ products and overall C2+ conversion efficiency of 19.8% are achieved with the easily implementable back pressure operation mode presented in this study. It is proven to be a promising tool for product selectivity control in future upscaled Cu‐based CO2 electrolysis cells.