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Orchanian, Nicholas M; Hong, Lorena E; Marinescu, Smaranda C
ACS catalysis, 10/2019, Letnik: 9, Številka: 10Journal Article
Conjugated molecular wires of rhenium bipyridine complexes were grown on flexible, lightweight, carbon-cloth electrodes through reductive diazonium electropolymerization. CO2 electrolysis studies reveal rapid (k cat ∼ 40 s–1) and selective (Faradaic efficiency >99%) conversion to CO with turnover numbers (TON) per rhenium site reaching ∼290 000 and catalytic currents (i cat) > 10 mA/cm2. This represents over an 80-fold increase in activity relative to our prior graphite systems and an ∼25-fold increase relative to the highest-performing immobilized rhenium bipyridine catalyst to date under analogous electrolysis conditions while maintaining prolonged activity. The high activity of these electrodes is explained by a mechanism initiated via electrochemical charging of the π-conjugated backbone followed by anion dissociation, CO2 coordination, and protonation. As numerous metal-bipyridine complexes are known for a broad scope of electrocatalytic transformations, these integrated carbon-cloth devices are anticipated to serve as a platform for future studies.
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