Journal
ACS ENERGY LETTERS
Volume 5, Issue 5, Pages 1612-1618Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c00637
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Funding
- Canadian Natural Science and Engineering Research Council [RGPIN 337345-13, RGPIN-2017-03732]
- Canadian Foundation for Innovation [229288]
- Canadian Institute for Advanced Research [BSE-BERL-162173]
- Canada Research Chairs
- Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program
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Gas-fed CO2 electrochemical flow reactors are appealing platforms for the electrolytic conversion of CO2 into fuels and chemical feedstocks at commercially relevant current densities (>= 100 mA/cm(2)). An inherent challenge in the development of these reactors is delivering sufficient water to the cathode to sustain the CO2 reduction reaction, while also preventing accumulation of excess water at the porous cathode (i.e., flooding). We present herein experimental evidence showing cathode flooding in a zero-gap electrolyzer at 200 mA/cm(2). This flooding causes a 37% decrease in partial current density for CO production (j(CO)) along with a 450 mV increase in cell voltage (E-cell). We show that the detrimental effects associated with this flooding can be mitigated by pairing thin membranes (i.e., <= 40 mu m) with hydrophobic cathodes to enable CO2 electrolysis at commercially relevant conditions (j(CO) >= 100 mA/cm(2) and E-cell < 3 V).
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