Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 14, Pages 3034-3038Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202000160
Keywords
carbon dioxide reduction; carbon monoxide; Fe complex; flow cell; hybrid materials
Categories
Funding
- Air Liquide
- Institut Universitaire de France (IUF)
- China Scholarship Council (CSC) [201603170259]
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Molecular catalysts have been shown to have high selectivity for CO2 electrochemical reduction to CO, but with current densities significantly below those obtained with solid-state materials. By depositing a simple Fe porphyrin mixed with carbon black onto a carbon paper support, it was possible to obtain a catalytic material that could be used in a flow cell for fast and selective conversion of CO2 to CO. At neutral pH (7.3) a current density as high as 83.7 mA cm(-2) was obtained with a CO selectivity close to 98 %. In basic solution (pH 14), a current density of 27 mA cm(-2) was maintained for 24 h with 99.7 % selectivity for CO at only 50 mV overpotential, leading to a record energy efficiency of 71 %. In addition, a current density for CO production as high as 152 mA cm(-2) (>98 % selectivity) was obtained at a low overpotential of 470 mV, outperforming state-of-the-art noble metal based catalysts.
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