Molecular Electrochemical Catalysis of the CO 2 -to-CO Conversion with a Co Complex: A Cyclic Voltammetry Mechanistic Investigation
- Cometto, Claudio
- Chen, Lingjing
- Anxolabéhère-Mallart, Elodie
- Fave, Claire
- Lau, Tai-Chu
- Robert, Marc
DOIAbstract
International audienceThe electrochemical catalytic reduction of CO2 into CO could be achieved with excellent selectivity and rate in acetonitrile in the presence of phenol with cobalt 2,2′:6′,2″:6″,2‴-quaterpyridine complex [CoII(qpy)(H2O)2]2+ (Co) acting as a molecular catalyst. Upon using cyclic voltammetry at low and high scan rate (up to 500 V/s) two catalytic pathways have been identified. At a low concentration of phenol (<1 M), catalysis mainly occurs after the reduction of Co with three electrons. In that case, the selectivity for CO production is ca. 80% with 20% of H2 as by product, along with a turnover frequency of 1.2 × 104 s−1 for COproduction at an overpotential η of ca. 0.6 V. The triply reduced active species binds to CO2 ...
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