Hydrogen on In2O3: Reducibility, Bonding, Defect Formation, and Reactivity

被引：132

作者：

Bielz, Thomas ^{[1
]}

Lorenz, Harald ^{[1
]}

Jochum, Wilfrid ^{[1
]}

Kaindl, Reinhard ^{[2
]}

Klauser, Frederik ^{[1
]}

Kloetzer, Bernhard ^{[1
]}

Penner, Simon ^{[1
]}

机构：

[1] Univ Innsbruck, Inst Phys Chem, A-6020 Innsbruck, Austria

[2] Univ Innsbruck, Inst Mineral & Petrog, A-6020 Innsbruck, Austria

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 19期

基金：

奥地利科学基金会;

关键词：

INDIUM OXIDE; WATER; SELECTIVITY; CATALYSTS; EXISTENCE; CARBON;

D O I：

10.1021/jp1017423

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

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.

引用

页码：9022 / 9029

页数：8

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