Angle resolved X-ray photoelectron spectroscopy study of Au deposited on Pt and Re surfaces

Bastl, Zdeněk; Pick, Štěpán

doi:10.1016/j.susc.2004.06.017

Cited by 27 publications

(27 citation statements)

References 14 publications

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“…For submonolayer Au coverages deposited on Pt(111) [68] and Pt(100) [69], the Au(4f 7/2 ) binding energies shift by ?0.4 to 0.6 eV as the coverage is raised from 0-1 ML; the reduced coordination of Au atoms at island edges for the lower Au coverages results in lower binding energies compared to bulk Au. The SCLS for Au deposited on Pt is not sensitive to the structure of the Pt surface [70]. Furthermore, the SCLS for the Au(4f) peaks is only slightly smaller for Pt-Au alloys compared to pure Au: -0.19 eV for Pt-2% Au and -0.26 eV for Pt-15% Au [67].…”

Section: Discussionmentioning

confidence: 90%

Characterization of Pt–Au and Ni–Au Clusters on TiO2(110)

Tenney

Ratliff

et al. 2011

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The surface composition and properties of PtAu and Ni-Au clusters on TiO 2 (110) have been studied by scanning tunneling microscopy (STM), low energy ion scattering (LEIS) and soft X-ray photoelectron spectroscopy (sXPS). STM studies show that bimetallic clusters are formed during sequential deposition of the two metals, regardless of the order of deposition. At the 2 ML of Au/ 2 ML of Pt or Ni coverages studied here, the second metal contributes to the growth of existing clusters rather than forming new pure metal clusters. LEIS experiments demonstrate that the surfaces of the bimetallic clusters are almost 100%

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Section: Discussionmentioning

confidence: 90%

Characterization of Pt–Au and Ni–Au Clusters on TiO2(110)

Tenney

Ratliff

et al. 2011

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“…The third, and the most likely explanation, is intermixing of Pt and Au atoms and the formation of a PtAu alloy on the surface of the Pt NPs. Indeed, although gold and platinum are largely immiscible in the bulk, nanoalloy as well as surface or interface alloy formation have been observed for both Pt on Au and Au on Pt . Low BE peak components or shifts of the whole Au 4f peak to lower BEs have been found in the past and have been attributed to Au alloyed with Pt .…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, although gold and platinum are largely immiscible in the bulk, nanoalloy as well as surface or interface alloy formation have been observed for both Pt on Au and Au on Pt . Low BE peak components or shifts of the whole Au 4f peak to lower BEs have been found in the past and have been attributed to Au alloyed with Pt . This assumption, however, implies that there is a region at the interface of the two metals, where partial alloying occurs under the applied bias .…”

Section: Resultsmentioning

confidence: 99%

Potential‐Induced Segregation Phenomena in Bimetallic PtAu Nanoparticles: An In Situ Near‐Ambient‐Pressure Photoelectron Spectroscopy Study

et al. 2015

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The surface properties of a model membrane electrode assembly of a high-temperature proton-exchange-membrane fuel cell with a nanostructured PtAu working electrode were studied under operando conditions (polarization, humidified H₂ atmosphere, 150 °C) using near-ambient-pressure photoelectron spectroscopy (NAP–XPS). NAP–XPS proved to be a powerful tool for the in situ investigation of the changes in the chemical composition, the segregation of the two metals, and the changes in their oxidation state. Nondestructive depth profiling revealed the influence of the polarization and the gas ambient on the distribution of the two metals in the near-surface region. The results suggest that the surface of the electrode is covered by a thin layer of gold, which is stable at potentials below the onset of surface-oxide formation. Anodic oxidation of the PtAu electrode pulls Pt to the surface, leading to intermixing of Pt and Au atoms and the formation of an interfacial allo

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“…For Co-Au system the alloying of the interface should not be encountered, because in the bulk the Co indiffusion into Au lattice and vice versa does not take place [3]. On the contrary, both Pt-Au and Co-Pt systems form solid-state solutions which prove the existence of diffusion of one element into the lattice of other one [4,5]. Taking into account the above assumption, we have introduced the alloyed interfaces only between Co and Pt and between Pt and Au layers.…”

Section: Resultsmentioning

confidence: 99%