Mesa, Camilo A.Steier, LudmillaMoss, BenjaminFrancas, LaiaThorne, James E.Graetzel, MichaelDurrant, James R.2020-10-012020-10-012020-10-012020-09-0310.1021/acs.jpclett.0c02004https://infoscience.epfl.ch/handle/20.500.14299/172047WOS:000569375400050Operando spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. While these photoanodes exhibit very different current/voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Higher temperature thermal annealing was found to correlate with a shift in the photocurrent onset potential toward less positive potentials, assigned to a suppression of both back electron-hole recombination and of charge accumulation in intra-bandgap states, indicating these intra-bandgap states do not contribute directly to water oxidation.Chemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, Atomic, Molecular & ChemicalChemistryScience & Technology - Other TopicsMaterials SciencePhysicsdriven oxygen evolutionrate law analysisphotoelectrode performancesurfacefilmsrecombinationelectrodesefficiencyvacanciesstatestext::journal::journal article::research article