The adsorption of oxygen on gold

Canning, N. D. S.; Outka, Duane A.; Madix, Robert J.

doi:10.1016/0039-6028(84)90209-7

Cited by 199 publications

(153 citation statements)

References 29 publications

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“…Having the fact that XPS in vacuum shows oxygen (i.e., PdO x ) on as-prepared samples in mind, we have concluded that the Pd-rich shells are kinetically stabilized by the conditions of our colloidal bimetallic nanoparticle synthesis. Table 1) [32][33][34][35]. The same is true at Au 50 Pd 50 .…”

Section: Composition-controlled Bimetallic Ausupporting

confidence: 60%

Surface Composition and Catalytic Evolution of Au x Pd1−x (x = 0.25, 0.50 and 0.75) Nanoparticles Under CO/O2 Reaction in Torr Pressure Regime and at 200 °C

et al. 2011

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Au x Pd 1-x (x = 0, 0.25, 0.5, 0.75, 1) nanoparticle (NP) catalysts (8-11 nm) were synthesized by a onepot reaction strategy using colloidal chemistry. XPS depth profiles with variable X-ray energies and scanning transmission electron microscopy (STEM) analyses show that the as-synthesized Au x Pd 1-x (x = 0.25 and 0.5) bimetallic NPs have gradient alloy structures with Au-rich cores and Pd-rich shells. The evolution of composition and structure in the surface region corresponding to a mean free path of 0.6-0.8 nm (i.e., 2-3 layers to the bulk from the particle surface) was studied with ambient pressure X-ray photoelectron spectroscopy (

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Section: Composition-controlled Bimetallic Ausupporting

confidence: 60%

Surface Composition and Catalytic Evolution of Au x Pd1−x (x = 0.25, 0.50 and 0.75) Nanoparticles Under CO/O2 Reaction in Torr Pressure Regime and at 200 °C

et al. 2011

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“…The TPD spectra of gold catalyst film did not show any amount of adsorbed oxygen, in accordance with the results from previous studies [17][18][19], suggesting that oxygen cannot adsorb on clean gold surfaces. Figure 2a shows a typical oxygen thermal desorption spectra after studies on Pt single crystals and polycrystalline samples [20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Gaseous Adsorptionsupporting

confidence: 93%

“…These results are very similar to those on Pt-film. As calculated from modified Redhead analysis by Falconer and Madix [33], the activation energy for desorption is 115-145 kJ/mol for the low temperature peak, very close to the reported value of 163 kJ/mol [18] for adsorbed atomic oxygen formed isolate this species we increase the adsorption temperature to 480 ~ which is 80 ~ higher than the desorption peak temperature of atomic oxygen. The corresponding TPD spectra are presented on Fig.…”

Section: Electrochemical Adsorptionmentioning

confidence: 53%

Thermal desorption study of Oxygen adsorption on Pt, Ag & Au films deposited on YSZ

Tsiplakides

Neophytides

Vayenas

1997

Ionics

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Abstract. The Thermal Desorption or Temperature Programmed Desorption (TPD) technique hasbeen used for the study of oxygen adsorption on Pt, Ag and Au catalyst films deposited on YSZ. The catalyst film was deposited on the one side of the YSZ specimen while on the other side gold counter and reference electrodes were deposited, constructing a three-electrode electrochemical cell similar to those used in Electrochemical Promotion studies. Oxygen adsorption has been carried out either by exposing the samples to gaseous oxygen (gas phase adsorption) or by the application of a constant current between the catalyst/working electrode and the counter electrode (electrochemical adsorption) or by mixed gas phase and electrochemical adsorption. Oxygen adsorption was carried out at temperatures between 200 and 480 ~ After exposure to gaseous oxygen, normal adsorbed atomic oxygen species have been observed on Pt and Ag surfaces while there was no detectable amount of adsorbed oxygen on Au. Electrochemical O 2-pumping to Pt, Ag and Au catalyst films creates strongly bonded "backspillover" anionic oxygen, along with the more weakly bonded atomic oxygen. Electrochemical 02. pumping to Pt, Ag and Au catalyst films in presence of preadsorbed oxygen creates strongly bonded "backspillover" anionic oxygen, with a concomitant pronounced lowering of the Tp of the more weakly bound preadsorbed atomic oxygen. The two oxygen species co-exist on the surface. The activation energy for oxygen desorption or, equivalently, the binding strength of adsorbed oxygen was found to decrease linearly with increasing catalyst potential, for all three metal electrodes.

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“…Freshly prepared samples are covered by a carbon overlayer, which probably prevents access of the gas mixture to the active sites of the catalyst. consists of three components ( In order to penetrate through the carbonaceous layer, photoelectrons with higher kinetic energy (900 eV) were used for measuring the Au 4f spectra ( shows only one sharp peak at a BE of 83.97 eV, assigned to bulk Au in its metal state, in accordance with the accepted Au 4f 7/2 binding energy value [71][72][73]. Note that the contribution from the neighboring Cu 3p 1/2 peak (blue line in Figure 3.35A) (BE 77.6 eV) [112] has to be taken into account for correct fitting.…”

Section: Discussionmentioning

confidence: 99%

Is Nanostructuring Sufficient To Get Catalytically Active Au?

et al. 2016

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Gold nanoparticles on transition-metal oxides were synthesized by two different methods: precipitation and photoinduced decomposition of an intermediate gold–azido complex. Only samples prepared by the precipitation method showed significant CO conversion at low temperature. XPS shows the formation of two Au species (Au0 and Auδ+) on the surface of active Au/TiO2 and Au/Fe2O3 samples. The energy shift of the Auδ+ peak depends on the support and is 0.6 and 0.9 eV for Au/TiO2 and Au/Fe2O3, respectively. TEM images indicate the formation of overlayer on Au particles. These results prove Au activation via a strong metal–support interaction, on the basis of the strong influence of the support on the electronic structure of the gold through charge transfer and stabilization of low-coordinated Au atoms.

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The adsorption of oxygen on gold

Cited by 199 publications

References 29 publications

Surface Composition and Catalytic Evolution of Au x Pd1−x (x = 0.25, 0.50 and 0.75) Nanoparticles Under CO/O2 Reaction in Torr Pressure Regime and at 200 °C

Surface Composition and Catalytic Evolution of Au x Pd1−x (x = 0.25, 0.50 and 0.75) Nanoparticles Under CO/O2 Reaction in Torr Pressure Regime and at 200 °C

Thermal desorption study of Oxygen adsorption on Pt, Ag & Au films deposited on YSZ

Is Nanostructuring Sufficient To Get Catalytically Active Au?

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