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Electrolysis of Gaseous CO2 to CO in a Flow Cell with a Bipolar Membrane AITranslate

Danielle A. Salvatore; David M. Weekes; Jingfu He; Kevan E. Dettelbach; Yuguang C. Li; Thomas E. Mallouk; Curtis P. Berlinguette;
The University of British Columbia; The University of British Columbia; The University of British Columbia; The University of British Columbia; University Park; University Park; The University of British Columbia
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Abstract AITranslate

The conversion of CO2 to CO is demonstrated in an electrolyzer flow cell containing a bipolar membrane at current densities of 200 mA/cm2 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/cm2) 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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DOI：https://doi.org/10.1021/acsenergylett.7b01017

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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/cm2 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/cm2) 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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GB/T 7714-2015 [1] Danielle A. Salvatore, David M. Weekes, Jingfu He, et al. ACS Energy Letters, 2018(3). DOI:10.1021/acsenergylett.7b01017.
MLA [1] Danielle A. Salvatore, et al., ACS Energy Letters, no. 3, 2018, https://doi.org/10.1021/acsenergylett.7b01017.
APA [1] Danielle A. Salvatore, David M. Weekes, Jingfu He, Kevan E. Dettelbach, Yuguang C. Li, Thomas E. Mallouk, & Curtis P. Berlinguette. (2018). ACS Energy Letters(3). https://doi.org/10.1021/acsenergylett.7b01017
IEEE [1] Danielle A. Salvatore, David M. Weekes, Jingfu He, Kevan E. Dettelbach, Yuguang C. Li, Thomas E. Mallouk, and Curtis P. Berlinguette, ACS Energy Letters, no. 3, 2018, doi: 10.1021/acsenergylett.7b01017.