Hydrogen Loading of Oxide Powder Particles: A Transmission IR Study for the Case of Zinc Oxide

Noei, Heshmat; Qiu, Han‐Yue; Wang, Yuemin; Mühler, Martin; Wöll, Christof

doi:10.1002/cphc.201000312

Cited by 40 publications

(52 citation statements)

References 33 publications

(43 reference statements)

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“…In-situ FT-IR spectroscopy is an excellent tool to track adsorption-induced changes of the conduction band electron concentration in n-type semiconducting oxides. [19][20][21][22][23][24] This also applies for nonstoichiometric In 2 O 3 . In principle IR spectroscopy is also the method of choice for a detailed characterization of the chemical nature and bonding of surface adsorbates.…”

Section: Equationmentioning

confidence: 97%

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O₂ Adsorption on In₂O_3–x Nanoparticles

2013

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Adsorption induced electronic property changes determine the performance of nanostructured transparent conductive oxides and sensor materials. For the study of O 2 adsorption on electron rich In 2 O 3−x nanoparticles we used transmission FT-IR spectroscopy in combination with electron paramagnetic resonance (EPR). The reversible emergence and annihilation of conduction band electrons is subject to O 2 adsorption and was tracked at different oxygen pressures via IR active Drude absorptions. Corresponding results were related to EPR measurements that were performed under identical experimental conditions. For the first time we identified a weak adsorption complex between O 2 and the surface of In 2 O 3−x nanoparticles in the temperature range between T = 90 K and T = 298 K. Complementing and supporting our FT-IR observations this evidence opens the way to study sensing relevant adsorption processes at room temperature with spectroscopy.

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Section: Equationmentioning

confidence: 97%

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O₂ Adsorption on In₂O_3–x Nanoparticles

2013

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“…Figure 5 UHV-FTIR difference spectra obtained from absorbance spectra taken before and after exposing the clean ZnO nanoparticles to atomic hydrogen ( p ¼ 5 Â 10 À5 mbar) at room temperature for different times (up to 50 min) [60]. and 870 cm À1 are attributed to the bidentate carbonate species formed on the polar O-ZnO facet exposing a high density of O vacancies.…”

Section: Co 2 /Znomentioning

confidence: 99%

“…In addition, an activation energy of 1.26 eV was estimated for the diffusion of H atoms into the bulk [59]. The electronic structure changes induced by the interstitial H atoms were also observed for ZnO nanoparticles using UHV-FTIRS [60]. As shown in Fig.…”

Section: H/znomentioning

confidence: 99%

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Vibrational spectroscopic studies on pure and metal‐covered metal oxide surfaces

Noei

Jin

Qiu

et al. 2013

Physica Status Solidi (b)

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234 3214182 y These authors contributed equally to this work.Metal oxides and metal nanoparticles dispersed on oxide substrates have gained increasing interest in surface science because of their widespread applications, especially in heterogeneous catalysis. In this review we summarize our recent vibrational spectroscopic studies on pure and metal-covered oxide surfaces (ZnO, TiO 2 , Au/ZnO and Cu/ZnO) using a number of small molecules (H 2 , CO, CO 2 , NO and HCOOH) as probes and/or reactants. High-resolution electron energy loss spectroscopy (HREELS) turned out to be a powerful tool to investigate well-defined oxide and metal/oxide model systems. The application of a novel ultrahigh vacuum IR spectroscopy (UHV-FTIRS) apparatus allowed us to record high-quality IR data on oxide surfaces of both single crystals and polycrystalline powder particles. We will particularly focus on following important issues: (i) the interaction of hydrogen with ZnO; (ii) structure and reactivity of polar and nonpolar ZnO surfaces; (iii) the role of defects in surface chemistry of oxides; (iv) the origin of significant difference in photocatalytic activity between anatase and rutile TiO 2 and (v) the interaction between metal nanoparticles and oxide supports. We will demonstrate that the data from HREELS and UHV-FTIRS provide detailed insight into structural, electronic and chemical properties of the studied systems.

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“…The lower values are roughly consistent with the concentrations of shallow donors in the form of ionized hydrogen atoms, which have been determined with a number of techniques, including infrared absorption, electron spin resonance, electron nuclear double resonance, photoluminescence, and electron energy loss spectroscopy. 6,8,[21][22][23] Temperature-induced ionization of these shallow donors has been observed, which leads to the conclusion that some of the intrinsic hydrogen does not contribute to conduction below room temperature. 24 Indeed, some of the lattice sites that bind hydrogen (within the lattice, at defects and interstitial) lead to the formation of donors, but neutral H atoms and H 2 molecules are found also.…”

Section: Introductionmentioning

confidence: 99%

Analysis of surface, subsurface, and bulk hydrogen in ZnO using nuclear reaction analysis

et al. 2011

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Hydrogen concentrations in ZnO single crystals exposing different surfaces have been determined to be in the range of (0.02-0.04) at.% with an error of ±0.01 at.% using nuclear reaction analysis. In the subsurface region, the hydrogen concentration has been determined to be higher by up to a factor of 10. In contrast to the hydrogen in the bulk, part of the subsurface hydrogen is less strongly bound, can be removed by heating to 550 • C, and reaccommodated by loading with atomic hydrogen. By exposing the ZnO(1010) surface to water above room temperature and to atomic hydrogen, respectively, hydroxylation with the same coverage of hydrogen is observed.

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Hydrogen Loading of Oxide Powder Particles: A Transmission IR Study for the Case of Zinc Oxide

Cited by 40 publications

References 33 publications

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O₂ Adsorption on In₂O_3–x Nanoparticles

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O₂ Adsorption on In₂O_3–x Nanoparticles

Vibrational spectroscopic studies on pure and metal‐covered metal oxide surfaces

Analysis of surface, subsurface, and bulk hydrogen in ZnO using nuclear reaction analysis

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Hydrogen Loading of Oxide Powder Particles: A Transmission IR Study for the Case of Zinc Oxide

Cited by 40 publications

References 33 publications

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O2 Adsorption on In2O3–x Nanoparticles

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O2 Adsorption on In2O3–x Nanoparticles

Vibrational spectroscopic studies on pure and metal‐covered metal oxide surfaces

Analysis of surface, subsurface, and bulk hydrogen in ZnO using nuclear reaction analysis

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Product

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First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O₂ Adsorption on In₂O_3–x Nanoparticles

First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O₂ Adsorption on In₂O_3–x Nanoparticles