Hydrogen on In2O3: Reducibility, Bonding, Defect Formation, and Reactivity
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- 作者：Thomas Bielz ; Harald Lorenz ; Wilfrid Jochum ; Reinhard Kaindl ; Frederik Klauser ; Bernhard Kltzer ; Simon Penner
- 刊名：Journal of Physical Chemistry C
- 出版年：2010
- 出版时间：May 20, 2010
- 年：2010
- 卷：114
- 期：19
- 页码：9022-9029
- 全文大小：337K
- 年卷期：v.114,no.19(May 20, 2010)
- ISSN：1932-7455
文摘
The adsorption, bonding, defect formation, and reactivity of hydrogen on different Inb>2 b>Ob>3 b> 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 bulk reduction, along with the formation of metallic In, sets in. Raman spectra indicate a considerable reordering of the Inb>2 b>Ob>3 b> 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 β-Gab>2 b>Ob>3 b>. Hydrogen-induced oxygen vacancies were found to be easily replenished by traces of water in the gas feed.