Characterization of photocatalytic TiO2 powder under varied environments using near ambient pressure X-ray photoelectron spectroscopy

Krishnan, Padmaja; Liu, Minghui; Itty, Pierre A.; Liu, Zhi; Rheinheimer, Vanessa; Zhang, Min-Hong; Monteiro, Paulo J.  M.; Yu, Liya E.

doi:10.1038/srep43298

Characterization of photocatalytic TiO₂ powder under varied environments using near ambient pressure X-ray photoelectron spectroscopy

Journal Article · Mon Feb 27 00:00:00 EST 2017 · Scientific Reports

DOI:https://doi.org/10.1038/srep43298· OSTI ID:1411654

Krishnan, Padmaja ^[1]; Liu, Minghui ^[1]; Itty, Pierre A. ^[2]; Liu, Zhi ^[3]; Rheinheimer, Vanessa ^[1]; Zhang, Min-Hong ^[1]; Monteiro, Paulo J. M. ^[2]; Yu, Liya E. ^[1]

National Univ. of Singapore (Singapore). Dept. of Civil and Environmental Engineering
Univ. of California, Berkeley, CA (United States). Dept. of Civil and Environmental Engineering
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source

Consecutive 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 (OH_br) and terminal hydroxyl (OH_t) 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Research Foundation (NRF) (Singapore); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1411654

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 7; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
photocatalysis
surface spectroscopy