Please use this identifier to cite or link to this item: https://doi.org/10.1038/srep43298
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dc.titleCharacterization of photocatalytic TiO2 powder under varied environments using near ambient pressure X-ray photoelectron spectroscopy
dc.contributor.authorKrishnan P.
dc.contributor.authorLiu M.
dc.contributor.authorItty P.A.
dc.contributor.authorLiu Z.
dc.contributor.authorRheinheimer V.
dc.contributor.authorZhang M.-H.
dc.contributor.authorMonteiro P.J.M.
dc.contributor.authorYu L.E.
dc.date.accessioned2020-09-02T06:36:20Z
dc.date.available2020-09-02T06:36:20Z
dc.date.issued2017
dc.identifier.citationKrishnan P., Liu M., Itty P.A., Liu Z., Rheinheimer V., Zhang M.-H., Monteiro P.J.M., Yu L.E. (2017). Characterization of photocatalytic TiO2 powder under varied environments using near ambient pressure X-ray photoelectron spectroscopy. Scientific Reports 7 : 43298. ScholarBank@NUS Repository. https://doi.org/10.1038/srep43298
dc.identifier.issn20452322
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/173939
dc.description.abstractConsecutive eight study phases under the successive presence and absence of UV irradiation, water vapor, and oxygen were conducted to characterize surface changes in the photocatalytic TiO2 powder using near-ambient-pressure X-ray photoelectron spectroscopy (XPS). Both Ti 2p and O 1s spectra show hysteresis through the experimental course. Under all the study environments, the bridging hydroxyl (OHbr) and terminal hydroxyl (OHt) are identified at 1.1-1.3 eV and 2.1-2.3 eV above lattice oxygen, respectively. This enables novel and complementary approach to characterize reactivity of TiO2 powder. The dynamic behavior of surface-bound water molecules under each study environment is identified, while maintaining a constant distance of 1.3 eV from the position of water vapor. In the dark, the continual supply of both water vapor and oxygen is the key factor retaining the activated state of the TiO2 powder for a time period. Two new surface peaks at 1.7-1.8 and 4.0-4.2 eV above lattice oxygen are designated as peroxides (OOH/H2O2) and H2O2 dissolved in water, respectively. The persistent peroxides on the powder further explain previously observed prolonged oxidation capability of TiO2 powder without light irradiation. © 2017 The Author(s).
dc.sourceUnpaywall 20200831
dc.typeArticle
dc.contributor.departmentDEPT OF CIVIL & ENVIRONMENTAL ENGG
dc.description.doi10.1038/srep43298
dc.description.sourcetitleScientific Reports
dc.description.volume7
dc.description.page43298
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