Electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ag</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O

Tjeng, L. H.; Meinders, M.B.J.; Elp, J. van; Ghijsen, J.; Sawatzky, G. A.; Johnson, R.L.

doi:10.1103/physrevb.41.3190

Cited by 357 publications

(207 citation statements)

References 41 publications

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“…The spectrum of the Ag 3d region of the Ag-modified sample is also symmetrical; the 3d 5/2 component is positioned at 367.8 eV, indicating the presence of silver oxides. [27]. The silver content of the Ag-TiO 2 /1 wt% sample determined by XPS analysis is 0.238 at%, a value sufficiently close to the calculated silver content (0.249 at%) ( Table 1).…”

Section: Surface and Optical Propertiessupporting

confidence: 78%

Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Kőrösi

Papp

Ménesi

et al. 2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Silver-modified titania samples (Ag-TiO 2 ) with varying silver content (0.1-1.0 wt%) were prepared. Silver-modification of titanium dioxide was examined by TEM, XRD, XPS and DR-UV-vis spectroscopy. Ag or AgO x particles on TiO 2 surface could not be observed by XRD and TEM investigation, however the color of the Ag-TiO 2 samples varied between light rose and purple-brown. XPS measurements revealed that silver exists mainly in oxide form. The photocatalytic activity of pure and Ag-TiO 2 samples were compared both in solid-liquid and in solid-gas interfaces. In the liquid phase the 2,2 -thiodiethanol was used as test molecule. Ethanol photodegradation was examined in gas phase at dry initial condition. It was shown that the rate of photooxidation of organic compounds significantly enhanced by silver-modification of titania.

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Section: Surface and Optical Propertiessupporting

confidence: 78%

Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Kőrösi

Papp

Ménesi

et al. 2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The difference spectrum (full circles) shows that this broadening is due to the appearance of a new feature at 367.65 eV. This feature is a clear indicator of silver ions Ag δ+ [7,10,43,44,47]. Using XPS signals from the nucleophilic oxygen (Fig.…”

Section: Resultsmentioning

confidence: 98%

Combined in situ XPS and PTRMS study of ethylene epoxidation over silver

Bukhtiyarov

Nizovskiĭ

Bluhm

et al. 2006

Journal of Catalysis

136

129

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Ethylene epoxidation over silver was investigated by combined in-situ X-ray photoelectron spectroscopy (XPS) and proton-transfer reaction mass-spectrometry (PTRMS) at temperatures from 300 to 520 K and in the pressure range from 0.07 to 1 mbar. Ethylene oxide was present among the reaction products at T ≥ 420 K and P ≥ 0.3 mbar. The catalytically active surface contains two oxygen species -nucleophilic and electrophilic oxygen. The observed correlation between the abundance of electrophilic oxygen and the yield of ethylene oxide expressed as C 2 H 4 O partial pressure indicates that namely this oxygen species oxidizes ethylene to ethylene oxide. Opposite trend is observed for nucleophilic oxygen: the higher is the abundance of this species, the lower is the yield of ethylene oxide. This result is in line with the known fact that nucleophilic oxygen due to its oxidic nature is active in total oxidation of ethylene to CO 2 and H 2 O. The low activity of silver at T < 420 K is caused by the presence of carbonates and carbonaceous residues at the silver surface that reduce the available silver surface area for the catalytic reaction. Reduction of the surface area available for the formation of active species due to accumulation of the embedded oxygen species explains also the decrease of the rate of ethylene oxide formation with time observed for T ≥ 470 K.

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“…It is well results, that is, NO 2 decomposed at the surface and formed new oxygen species (9.45 eV ) assigned shifts in binding energy of Ag 3d have been commonly monitored for various components, while to bulk-incorporated oxygen. When the temperature reached 825 K, this peak disappeared, and contrarily, the binding energy tends to shift towards lower energy in the oxide states [21][22][23]. UPS could only detect the weak signal of the cstate adsorbed oxygen (2.4 eV ).…”

Section: The Results Of Xps and Upsmentioning

confidence: 99%