Towards sustainable energy: photocatalysis of Cr-doped TiO2. 5. Effect of segregation on surface versus bulk composition

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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.authorLiu, Ren_AU
dc.contributor.authorNowotny, Jen_AU
dc.date.accessioned2020-10-22T05:17:35Zen_AU
dc.date.available2020-10-22T05:17:35Zen_AU
dc.date.issued2017-11-07en_AU
dc.date.statistics2020-10-20en_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. This work considers the effect of oxygen activity on segregation-induced surface versus bulk composition for both polycrystalline and single-crystal specimens of Cr-doped TiO2. It has been documented that annealing of Cr-doped TiO2 at 1273 K in oxidising conditions results in an enrichment and depletion of the surface layer with chromium. It is shown that the segregation-induced enrichment factor for single crystal is substantially larger than that for polycrystalline specimen. The effect is considered in terms of a theoretical model showing that surface segregation of solute in polycrystalline specimen is encumbered by its segregation to grain boundaries. It is also shown that the segregation-induced enrichment is profoundly influenced by oxygen activity. The new insight of this work involves (i) the determination of well-defined chromium segregation in Cr-doped TiO2, including single-crystal and polycrystalline specimens, after annealing in the gas phase of controlled oxygen activity, and (ii) identification of the predominant driving force of segregation of chromium in Cr-doped TiO2 that is based on electrostatic interactions between the low-dimensional surface structure (LDSS) and electrically charge segregating species. © 2018 Springer Nature Switzerland AGen_AU
dc.identifier.citationRahman, K. A., Bak, T., Atanacio, A., Ionescu, M., Liu, R., & Nowotny, J. (2018). Towards sustainable energy: photocatalysis of Cr-doped TiO 2. 5. Effect of segregation on surface versus bulk composition. Ionics, 24(4), 1211-1219. doi:10.1007/s11581-017-2326-0en_AU
dc.identifier.issn0947-7047en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleIonicsen_AU
dc.identifier.pagination1211-1219en_AU
dc.identifier.urihttps://doi.org/10.1007/s11581-017-2326-0en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9919en_AU
dc.identifier.volume24en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectTitaniumen_AU
dc.subjectSegregationen_AU
dc.subjectChromiumen_AU
dc.subjectOxygenen_AU
dc.subjectPhotocatalysisen_AU
dc.subjectMetallographyen_AU
dc.subjectTitanium compoundsen_AU
dc.subjectChromium compoundsen_AU
dc.subjectCrystal structureen_AU
dc.subjectEnergy conversionen_AU
dc.subjectGrain boundariesen_AU
dc.subjectOxide mineralsen_AU
dc.subjectMonocrystalsen_AU
dc.titleTowards sustainable energy: photocatalysis of Cr-doped TiO2. 5. Effect of segregation on surface versus bulk compositionen_AU
dc.typeJournal Articleen_AU
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