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Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

preprint
submitted on 18.06.2020 and posted on 19.06.2020 by Camilo A. Mesa, Ludmilla Steier, Benjamin Moss, Laia Francàs, James E. Thorne, Michael Grätzel, James R Durrant

Operando spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.

Funding

An Artificial Leaf: a photo-electro-catalytic cell from earth-abundant materials for sustainable solar production of CO2-based chemicals and fuels

European Commission

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Colombian Science Ministry (former COLCIENCIAS, call 568)

EPSRC

History

Email Address of Submitting Author

cam111@imperial.ac.uk

Institution

Imperial College London

Country

United Kingdom

ORCID For Submitting Author

0000-0002-8450-2563

Declaration of Conflict of Interest

The authors declare no competing financial interests.

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