Journal
CHEMICAL SCIENCE
Volume 11, Issue 33, Pages 8854-8861Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc03047c
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Funding
- Villum Foundation V-SUSTAIN [9455]
- ECOEthylene project from Innovation Fund Denmark [8057-00018B]
- SELECTCO2 project from Horizon 2020 of the EU [851441]
- National Research Foundation of Korea [NRF-2019R1A2C2002156]
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In this work, the effect of ion-selective membranes on the detailed carbon balance was systematically analyzed for high-rate CO(2)reduction in GDE-type flow electrolyzers. By using different ion-selective membranes, we show nearly identical catalytic selectivity for CO(2)reduction, which is primarily due to a similar local reaction environment created at the cathode/electrolyte interfaceviathe introduction of a catholyte layer. In addition, based on a systematic exploration of gases released from electrolytes and the dynamic change of electrolyte speciation, we demonstrate the explicit discrepancy in carbon balance paths for the captured CO(2)at the cathode/catholyte interfaceviareaction with OH(-)when using different ion-selective membranes: (i) the captured CO(2)could be transported through an anion exchange membrane in the form of CO32-, subsequently releasing CO(2)along with O(2)in the anolyte, and (ii) with a cation exchange membrane, the captured CO(2)would be accumulated in the catholyte in the form of CO32-, while (iii) with the use of a bipolar membrane, the captured CO(2)could be released at the catholyte/membrane interface in the form of gaseous CO2. The unique carbon balance path for each type of membrane is linked to ion species transported through the membranes.
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