Towards sustainable energy. Photocatalysis of Cr-doped TiO2: 3. Effect of oxygen activity

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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.accessioned2020-10-25T19:22:05Zen_AU
dc.date.available2020-10-25T19:22:05Zen_AU
dc.date.issued2018-12-04en_AU
dc.date.statistics2020-10-23en_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 vs. bulk properties. The present work reports the effect of oxygen activity in the oxide lattice on photocatalytic activity of pure and Cr-doped TiO2 (0.04 at% Cr). Processing of specimens included annealing at 1273 K in the gas phase of controlled oxygen activity in the range 10−12 Pa < p(O2) < 105 Pa. We show that the increase of oxygen activity results initially in a decrease of photocatalytic activity, minimum around the n-p transition point, and then increase assuming maximum at p(O2) = 105 Pa. The obtained results are considered in terms of a theoretical model that explains the effect of defect disorder on the reactivity of TiO2 with water. The minimum of the photocatalytic activity corresponds to the n-p transition point. The maximum of performance at high p(O2) is determined by increased concentration of titanium vacancies forming surface active sites.© 2018 Springer Nature Switzerland AGen_AU
dc.identifier.citationRahman, K. A., Bak, T., Atanacio, A., Ionescu, M., & Nowotny, J. (2018). Towards sustainable energy. Photocatalysis of Cr-doped TiO 2: 3. Effect of oxygen activity. Ionics, 24, 861-872. doi:10.1007/s11581-017-2304-6en_AU
dc.identifier.issn0947-7047en_AU
dc.identifier.journaltitleIonicsen_AU
dc.identifier.pagination861-872en_AU
dc.identifier.urihttps://doi.org/10.1007/s11581-017-2304-6en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9930en_AU
dc.identifier.volume7en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectTitaniumen_AU
dc.subjectChromiumen_AU
dc.subjectDefectsen_AU
dc.subjectPhotocatalysisen_AU
dc.subjectOxygenen_AU
dc.subjectReactivityen_AU
dc.titleTowards sustainable energy. Photocatalysis of Cr-doped TiO2: 3. Effect of oxygen activityen_AU
dc.typeJournal Articleen_AU
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