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Exploring the Electrochemistry of Iron Dithiolene and Its Potential for Electrochemical Homogeneous Carbon Dioxide Reduction

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
Article numbere202200610
<mark>Journal publication date</mark>13/09/2022
<mark>Journal</mark>ChemElectroChem
Issue number17
Volume9
Number of pages11
Publication StatusPublished
Early online date4/08/22
<mark>Original language</mark>English

Abstract

In this work, the dithiolene complex iron(III) bis-maleonitriledithiolene [Fe(mnt) 2 ] is characterised and evaluated as a homogeneous CO 2 reduction catalyst. Electrochemically the Fe(mnt) 2 is reduced twice to the trianionic Fe(mnt) 2 3- state, which is correspondingly found to be active towards CO 2 . Interestingly, the first reduction event appears to comprise overlapping reversible couples, attributed to the presence of both a dimeric and monomeric form of the dithiolene complex. In acetonitrile Fe(mnt) 2 demonstrates a catalytic response to CO 2 yielding typical two-electron reduction products; H 2 , CO and CHOOH. The product distribution and yield were governed by the proton source. Operating with H 2 O as the proton source gave only H 2 and CO as products, whereas using 2,2,2-trifluoroethanol gave 38% CHOOH faradaic efficiency with H 2 and CO as minor products.