Unraveling the Surface Reactivity of Pristine and Ti-Doped Hematite with Water
Pierre-Marie Deleuze, H. Magnan, Antoine Barbier, Mathieu G. Silly, B. Domenichini, Céline Dupont
Abstract
Water adsorption and dissociation on undoped and Ti-doped hematite thin films were investigated using near-ambient pressure photoemission and DFT calculations. A fine understanding of doping effects is of prime importance in the framework of photoanode efficiency in aqueous conditions. By comparison to pure Fe2O3 surface, the Ti(2%)-Fe2O3 surface shows a lower hydroxylation level. We demonstrate that titanium induces wide structural modifications of the surface, preventing it from reaching full hydroxylation.
Topics & Concepts
HematiteDopingAdsorptionDissociation (chemistry)Materials scienceHydroxylationAqueous solutionChemical engineeringTitaniumX-ray photoelectron spectroscopyInorganic chemistryNanotechnologyChemistryPhysical chemistryMetallurgyOrganic chemistryOptoelectronicsEnzymeEngineeringIron oxide chemistry and applicationsMinerals Flotation and Separation TechniquesMine drainage and remediation techniques