Toward sustainable energy: photocatalysis of Cr-doped TiO2: 2. effect of defect disorder

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dc.contributor.authorRahman, KAen_AU
dc.contributor.authorBak, Ten_AU
dc.contributor.authorAtanacio, AJen_AU
dc.contributor.authorIonescu, Men_AU
dc.contributor.authorNowotny, Jen_AU
dc.date.accessioned2020-09-03T00:06:49Zen_AU
dc.date.available2020-09-03T00:06:49Zen_AU
dc.date.issued2017-12-26en_AU
dc.date.statistics2020-08-25en_AU
dc.description.abstractThe present chain of five papers considers the concept of solar-to-chemical energy conversion using TiO2-based semiconductors. The series reports the effect of chromium on the key performance-related properties of polycrystalline TiO2 (rutile), including electronic structure, photocatalytic activity, intrinsic defect disorder, electrochemical coupling and surface versus bulk properties. In this work, we show that the effect of chromium on photocatalytic performance of TiO2 depends on its elemental content and the related defect disorder that is determined by oxygen activity in the oxide lattice. At high oxygen activity, chromium leads to enhanced photocatalytic performance only for dilute solid solutions (up to 0.04–0.043 at.% Cr). Higher chromium content results in a decrease of photocatalytic activity below that for pure TiO2, despite the observed substantial decrease of the band gap. The photocatalytic performance of Cr-doped TiO2 annealed in reducing conditions is low within the entire studied range of compositions. The obtained results led to derivation of a theoretical model representing the mechanism of the light-induced reactivity of TiO2 with water and the related charge transfer. The photocatalytic performance is considered in terms of a competitive effect of several key performance-related properties. The performance is predominantly influenced by the concentration of titanium vacancies acting as reactive surface sites related to anodic charge transfer. © 2018 Springer Natureen_AU
dc.identifier.citationRahman, K. A., Bak, T., Atanacio, A., Ionescu, M., & Nowotny, J. (2018). Toward sustainable energy: photocatalysis of Cr-doped TiO 2: 2. effect of defect disorder. Ionics, 24(2), 327-341. doi:10.1007/s11581-017-2370-9en_AU
dc.identifier.govdoc9963en_AU
dc.identifier.issn0947-7047en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleIonicsen_AU
dc.identifier.pagination327-341en_AU
dc.identifier.urihttps://doi.org/10.1007/s11581-017-2370-9en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9767en_AU
dc.identifier.volume24en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectPhotocatalysisen_AU
dc.subjectCatalysisen_AU
dc.subjectChromiumen_AU
dc.subjectChromium compoundsen_AU
dc.subjectElectronic structureen_AU
dc.subjectEnergy conversionen_AU
dc.subjectEnergy gapen_AU
dc.subjectOxide mineralsen_AU
dc.titleToward sustainable energy: photocatalysis of Cr-doped TiO2: 2. effect of defect disorderen_AU
dc.typeJournal Articleen_AU
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