Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 19, Pages 9022-9029Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1017423
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Funding
- FWF (Austrian Science Foundation) [P20892-N19]
- Austrian Science Fund (FWF) [P20892] Funding Source: Austrian Science Fund (FWF)
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The adsorption, bonding, defect formation, and reactivity of hydrogen on different In2O3 powder samples were studied by a combination of volumetric adsorption, thermal desorption, diffraction, and spectroscopic techniques. Surface reduction was observed in dry hydrogen up to 400 K, followed by reduction of surface-near regions. Above 500 K hulk reduction, along with the formation of metallic In, sets in. Raman spectra indicate a considerable reordering of the In2O3 structure in this temperature regime. Despite their TPD proven presence, the related adsorbed H-containing species were not detectable by Fourier transform infrared spectroscopy and/or Raman spectroscopy, in strong contrast to related experiments on beta-Ga2O3. Hydrogen-induced oxygen vacancies were found to be easily replenished by traces of water in the gas feed.
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