Instability of Hydrogenated TiO2

Manjula I. Nandasiri, Vaithiyalingam Shutthanandan, Sandeep Manandhar, Ashleigh M. Schwarz, Lucas Oxenford, John V. Kennedy, Suntharampillai Thevuthasan, Michael A. Henderson

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Hydrogenated TiO2 (H-TiO2) is touted as a viable visible light photocatalyst. We report a systematic study on the thermal stability of H-implanted TiO2 using nuclear reaction analysis (NRA), Rutherford backscattering spectrometry, ultraviolet photoelectron spectroscopy, and X-ray photoelectron spectroscopy. Protons (40 keV) implanted at a ∼2 atom % level within a ∼120 nm wide profile of rutile TiO2(110) were situated ∼300 nm below the surface. NRA revealed that this H-profile broadened toward the surface after annealing at 373 K, dissipated out of the crystal into vacuum at 473 K, and was absent within the beam sampling depth (∼800 nm) at 523 K. Photoemission showed that the surface was reduced in concert with these changes. Similar anneals had no effect on pristine TiO2(110). The facile bulk diffusivity of H in rutile at low temperatures, as well as its interfacial activity toward reduction, significantly limits the utilization of H-TiO2 as a photocatalyst.

Original languageEnglish
Pages (from-to)4627-4632
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume6
Issue number22
DOIs
Publication statusPublished - 19 Nov 2015
Externally publishedYes

Fingerprint

Photoelectron Spectroscopy
Nuclear reactions
Photocatalysts
Vacuum
Ultraviolet photoelectron spectroscopy
Protons
Spectrum Analysis
Hot Temperature
Rutherford backscattering spectroscopy
Photoemission
Light
Spectrometry
Temperature
Thermodynamic stability
Thermodynamic properties
X ray photoelectron spectroscopy
Annealing
Sampling
Atoms
Crystals

Keywords

  • diffusion
  • hydrogen
  • implantation
  • rutile
  • surface reduction
  • TiO(110)

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Nandasiri, M. I., Shutthanandan, V., Manandhar, S., Schwarz, A. M., Oxenford, L., Kennedy, J. V., ... Henderson, M. A. (2015). Instability of Hydrogenated TiO2 Journal of Physical Chemistry Letters, 6(22), 4627-4632. https://doi.org/10.1021/acs.jpclett.5b02219

Instability of Hydrogenated TiO2 . / Nandasiri, Manjula I.; Shutthanandan, Vaithiyalingam; Manandhar, Sandeep; Schwarz, Ashleigh M.; Oxenford, Lucas; Kennedy, John V.; Thevuthasan, Suntharampillai; Henderson, Michael A.

In: Journal of Physical Chemistry Letters, Vol. 6, No. 22, 19.11.2015, p. 4627-4632.

Research output: Contribution to journalArticle

Nandasiri, MI, Shutthanandan, V, Manandhar, S, Schwarz, AM, Oxenford, L, Kennedy, JV, Thevuthasan, S & Henderson, MA 2015, 'Instability of Hydrogenated TiO2 ', Journal of Physical Chemistry Letters, vol. 6, no. 22, pp. 4627-4632. https://doi.org/10.1021/acs.jpclett.5b02219
Nandasiri MI, Shutthanandan V, Manandhar S, Schwarz AM, Oxenford L, Kennedy JV et al. Instability of Hydrogenated TiO2 Journal of Physical Chemistry Letters. 2015 Nov 19;6(22):4627-4632. https://doi.org/10.1021/acs.jpclett.5b02219
Nandasiri, Manjula I. ; Shutthanandan, Vaithiyalingam ; Manandhar, Sandeep ; Schwarz, Ashleigh M. ; Oxenford, Lucas ; Kennedy, John V. ; Thevuthasan, Suntharampillai ; Henderson, Michael A. / Instability of Hydrogenated TiO2 In: Journal of Physical Chemistry Letters. 2015 ; Vol. 6, No. 22. pp. 4627-4632.
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