Journal
ACS ENERGY LETTERS
Volume 3, Issue 1, Pages 149-154Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b01017
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Funding
- Canadian Natural Science and Engineering Research Council [RGPIN 337345-13]
- Canadian Foundation for Innovation [229288]
- Canadian Institute for Advanced Research [BSE-BERL-162173]
- Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Energy Biosciences, Department of Energy [DE-FG02-07ER15911]
- Canada Research Chairs
- Canada First Research Excellence Fund
- Quantum Materials and Future Technologies Program
- Killam Trusts
- NSERC
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The conversion of CO2 to CO is demonstrated in an electrolyzer flow cell containing a bipolar membrane at current densities of 200 mA/cm(2) with a Faradaic efficiency of 50%. Electrolysis was carried out by delivering gaseous CO2 at the cathode with a silver catalyst integrated in a carbon-based gas diffusion layer. Nonprecious nickel foam in a strongly alkaline electrolyte (1 M NaOH) was used to mediate the anode reaction. While a configuration where the anode and cathode were separated by only a bipolar membrane was found to be unfavorable for robust CO2 reduction, a modified configuration with a solid-supported aqueous layer inserted between the silver-based catalyst layer and the bipolar membrane enhanced the cathode selectivity for CO2 reduction to CO. We report higher current densities (200 mA/cm(2)) than previously reported for gas-phase CO2 to CO electrolysis and demonstrate the dependence of long-term stability on adequate hydration of the CO2 inlet stream.
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