XPS and XAES study of Ag–Pd and Cu–Ni alloys: spectra, shifts and electronic structure information

Barbieri, P.F.; Siervo, Abner de; Carazzolle, Marcelo Falsarella; Landers, Richard; Kleiman, G. G.

doi:10.1016/j.elspec.2004.02.121

Cited by 56 publications

(40 citation statements)

References 44 publications

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“…[47]. However crossing this information with the TPR where higher reoxidized fraction was observed for this sample at least 15 % of the species should be Cu + species, which are presumably reduced before starting the WGS reaction.…”

Section: X-ray Photoelectron Spectroscopy Analysesmentioning

confidence: 98%

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Arbeláez

Reina

Ivanova

et al. 2015

Applied Catalysis A: General

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Highlights-Efficient Cu-Ni catalysts supported on activated carbon for the water gas shift reaction.-Supressed methanation activity due to the presence of Cu.-Cu-Ni alloy as a key factor of the catalytic design.-Good stability and tolerance towards start/stop situations. AbstractThe water-gas shift (WGS) reaction over structured Cu, Ni, and bimetallic Cu-Ni supported on active carbon (AC) catalysts was investigated. The structured catalysts were prepared in pellets form and applied in the medium range WGS reaction. A good activity in the 180-350 °C temperature range was registered being the bimetallic Cu-Ni:2-1/AC catalyst the best catalyst. Page 2 of 38A c c e p t e d M a n u s c r i p tThe presence of Cu mitigates the methanation activity of Ni favoring the shift process. In addition the active carbon gasification reaction was not observed for the Cu-containing catalyst converting the active carbon in a very convenient support for the WGS reaction. The stability of the bimetallic Cu-Ni:2-1/AC catalyst under continuous operation conditions, as well as its tolerance towards start/stop cycles was also evaluated.

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Section: X-ray Photoelectron Spectroscopy Analysesmentioning

confidence: 98%

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Arbeláez

Reina

Ivanova

et al. 2015

Applied Catalysis A: General

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“…More specifically considering core-level shifts, there are several experiments [6,80,50], while theoretical works include results for bulk [16][17][18], surface [23] and thin films [25,91]. A difference between older and newer experimental values was attributed to measurements performed on surface alloys rather than bulk in the older study [50]. By using the Green's functions calculations described in section 2.5 it is relatively easy to map overall trends in systems, as compared with more time consuming supercell techniques.…”

Section: Average Global Environmentmentioning

confidence: 99%

“…While we here focus on theoretical results, experimental measurements and further discussion can be found in e.g. [5,6,50,[73][74][75][76][77][78][79][80] and references below.…”

Section: Core-level Shift In Disordered Alloysmentioning

confidence: 99%

First principle calculations of core-level binding energy and Auger kinetic energy shifts in metallic solids

Olovsson

Marten

Holmström

et al. 2010

Journal of Electron Spectroscopy and Related Phenomena

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We present a brief overview of recent theoretical studies of the core-level binding energy shift (CLS) in solid metallic materials. The focus is on first principles calculations using the complete screening picture, which incorporates the initial (ground state) and final (core-ionized) state contributions of the electron photoemission process in x-ray photoelectron spectroscopy (XPS), all within density functional theory (DFT). Considering substitutionally disordered binary alloys, we demonstrate that on the one hand CLS depend on average conditions, such as volume and overall composition, while on the other hand they are sensitive to the specific local atomic environment. The possibility of employing layer resolved shifts as a tool for characterizing interface quality in fully embedded thin films is also discussed, with examples for CuNi systems. An extension of the complete screening picture to core-core-core Auger transitions is given, and new results for the influence of local environment effects on Auger kinetic energy shifts in fcc AgPd are presented.

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“…The shift at 300°C is comparable to the results of the Ni 5 Cu 5 / Pt and references of Ni 2p shift in NiCu alloys. 34,36 The calculated Ni 2p core-level shift in a NiCu alloy is approximately the same than the experimentally observed shift. The binding-energy shift of Cu 2p is still negative but has decreased considerably being maximum −0.1 eV at temperatures between 320 and 400°C.…”

Section: Ni 5 Cu 5 Without Pt Cappingmentioning

confidence: 54%

“…32 and 33͒ while it is maximum −0.25 eV in the case of Ni 1−x Cu x alloys. 34,35 Also the Ni 2p core-level spectra were measured at each temperature. A most reasonable expectation would be to observe a binding-energy shift caused by alloying also for this case.…”

Section: Methodsmentioning

confidence: 99%

Investigation of interface properties of Ni/Cu multilayers by high kinetic energy photoelectron spectroscopy

et al. 2009

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High kinetic-energy photoelectron spectroscopy ͑HIKE͒ or hard x-ray photoelectron spectroscopy has been used to investigate the alloying of Ni/Cu ͑100͒ multilayers. Relative intensities of the corelevels and their chemical shifts derived from binding energy changes are shown to give precise information on physicochemical properties and quality of the buried layers. Interface roughening, including kinetic properties such as the rate of alloying, and temperature effects on the processes can be analyzed quantitatively. Using HIKE, we have been able to precisely follow the deterioration of the multilayer structure at the atomic scale and observe the diffusion of the capping layer into the multilayer structure which in turn is found to lead to a segregation in the ternary system. This is of great importance for future research on multilayered systems of this kind. Our experimental data are supplemented by first-principles theoretical calculations of the core-level shifts for a ternary alloy to allow for modeling of the influence of capping materials on the chemical shifts.

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XPS and XAES study of Ag–Pd and Cu–Ni alloys: spectra, shifts and electronic structure information

Cited by 56 publications

References 44 publications

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

First principle calculations of core-level binding energy and Auger kinetic energy shifts in metallic solids

Investigation of interface properties of Ni/Cu multilayers by high kinetic energy photoelectron spectroscopy

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