The enhancement of CO2 reduction in the PEM electrochemical cell with a buffer layer is attributed to the optimization of H+ and CO2 concentration at the reactions sites in the cathode. The effects of H+ concentrationon the Faradaic efficiency were confirmed by the results of CO2 reduction with a liquid buffer layer with different pH values. As a result, the Faradaic efficiency towards formation of formic acid can be further improved by optimizing the buffer layer thickness and subsequently tuning the H+ concentration at the cathode surface. The optimized thickness of the buffer layer was found ~ 3 mm. The buffer layer thickness dependency of H+ concentration at the cathode electrode will be reported.
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