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

submitted on 18.06.2020, 15:11 and posted on 19.06.2020, 11:26 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.


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Colombian Science Ministry (former COLCIENCIAS, call 568)



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Imperial College London


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The authors declare no competing financial interests.