[M(CO)4(2,2′-bipyridine)] (M = Cr, Mo, W) as efficient catalysts for electrochemical reduction of CO2 to CO at a gold electrode

Tory, J., Setterfield-Price, B., Dryfe, R. A. W. and Hartl, F. ORCID: https://orcid.org/0000-0002-7013-5360 (2015) [M(CO)4(2,2′-bipyridine)] (M = Cr, Mo, W) as efficient catalysts for electrochemical reduction of CO2 to CO at a gold electrode. ChemElectroChem, 2 (2). pp. 213-217. ISSN 2196-0216 doi: 10.1002/celc.201402282

Abstract/Summary

Group 6 complexes of the type [M(CO)4(bpy)] (M=Cr, Mo, W) are capable of behaving as electrochemical catalysts for the reduction of CO2 at potentials less negative than those for the reduction of the radical anions [M(CO)4(bpy)].−. Cyclic voltammetric, chronoamperometric and UV/Vis/IR spectro-electrochemical data reveal that five-coordinate [M(CO)3(bpy)]2− are the active catalysts. The catalytic conversion is significantly more efficient in N-methyl-2-pyrrolidone (NMP) compared to tetrahydrofuran, which may reflect easier CO dissociation from 1e−-reduced [M(CO)4(bpy)].− in the former solvent, followed by second electron transfer. The catalytic cycle may also involve [M(CO)4(H-bpy)]− formed by protonation of [M(CO)3(bpy)]2−, especially in NMP. The strongly enhanced catalysis using an Au working electrode is remarkable, suggesting that surface interactions may play an important role, too.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/39212
Identification Number/DOI	10.1002/celc.201402282
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	2,2′-bipyridine;carbon dioxide;electrocatalysis;gold cathode;N-methyl-2-pyrrolidone;molybdenum
Publisher	ChemPubSoc Europe.
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