On the Homogeneity of a Cobalt-Based Water Oxidation Catalyst

On the Homogeneity of a Cobalt-Based Water Oxidation Catalyst

The homogeneity of molecular Co-based water oxidation catalysts (WOCs) has been a subject of debate over the last 10 years as assumed various homogeneous Co-based WOCs were found to actually form CoO x under operating conditions. The homogeneity of the Co­(HL) (HL = N,N-bis­(2,2′-bipyrid-6-yl)­amine...

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Veröffentlicht in:ACS catalysis 2022-04, Vol.12 (8), p.4597-4607
Hauptverfasser: Boer, Daan den, Siberie, Quentin, Siegler, Maxime A, Ferber, Thimo H, Moritz, Dominik C, Hofmann, Jan P, Hetterscheid, Dennis G. H
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container_end_page 4607
container_issue 8
container_start_page 4597
container_title ACS catalysis
container_volume 12
creator Boer, Daan den
Siberie, Quentin
Siegler, Maxime A
Ferber, Thimo H
Moritz, Dominik C
Hofmann, Jan P
Hetterscheid, Dennis G. H
description The homogeneity of molecular Co-based water oxidation catalysts (WOCs) has been a subject of debate over the last 10 years as assumed various homogeneous Co-based WOCs were found to actually form CoO x under operating conditions. The homogeneity of the Co­(HL) (HL = N,N-bis­(2,2′-bipyrid-6-yl)­amine) system was investigated with cyclic voltammetry, electrochemical quartz crystal microbalance, and X-ray photoelectron spectroscopy. The obtained experimental results were compared with heterogeneous CoO x . Although it is shown that Co­(HL) interacts with the electrode during electrocatalysis, the formation of CoO x was not observed. Instead, a molecular deposit of Co­(HL) was found to be formed on the electrode surface. This study shows that deposition of catalytic material is not necessarily linked to the decomposition of homogeneous cobalt-based water oxidation catalysts.
doi_str_mv 10.1021/acscatal.2c01299
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