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Voltage and current characteristics of an electrolyzer that couples bicarbonate conversion with hydrogen oxidation. Vcell values were measured as a function of current density from 100 to 1000 mA cm–2 for the OER|BPM|HCO3– and HOR|CEM|HCO3– electrolyzers under 1.0 and 3.5 atm of pressure. At 3.5 atm, 50 μm Nafion was used in the HOR|CEM|HCO3– electrolyzer instead of 25 μm Nafion. Faradaic efficiencies for CO production (FECO) for each electrolyzer are annotated at discrete points.
