Interaction of Carbon Dioxide with Oxidised La/Cu(111)
Abstract
The interaction of carbon dioxide at 300 K with various types of pre-oxidised lanthanum films on Cu(111) has been examined in detail by X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), ΔΦ(work function) measurements and temperature-programmed desorption (TPD). The exact nature and extent of the interactions of CO2 with the LaOx films proved to be strongly dependent on the oxide preparation and the thickness of the film, although spectral evidence points to the predominant formation of various surface carbonate complexes in all cases. On the partially-reduced surfaces there is a greater probability for irreversible adsorption, with thermal dissociation leading to the generation of gas-phase CO, but the extent of the overall adsorption process is not related to the surface oxygen vacancy concentration. The strongest binding and largest uptake of CO2 were found on disordered, unannealed oxide films and this is discussed in the context of the properties of metal/lanthana catalysts for methanol synthesis.
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The La/Ni fluctuations are likely formed due to NiO evaporation and interaction of film surface with environment during heat treatment.
“These fluctuations are likely formed due to NiO evaporation and an interaction of the film surface with the environment during the heat treatment [50,51,52,53,54,55].”
From Control of Columnar Grain Microstructure in CSD LaNiO3 Films (2023) · cites this paper as [55]
The film surface changes in composition due to NiO evaporation and interaction with atmosphere.
“As it was pointed earlier (see Figure 2), the film surface changes in composition due to NiO evaporation and interaction with the atmosphere [50,51,52,53,54,55].”
From Control of Columnar Grain Microstructure in CSD LaNiO3 Films (2023) · cites this paper as [55]
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Control of Columnar Grain Microstructure in CSD LaNiO3 Films
Atanova, A. V., Seregin, D. S., Zhigalina, O. M., Khmelenin, D. N., Orlov, G. A., Turkina, D. I., Sigov, A. S., & Vorotilov, K. A. (2023) · Molecules · doi:10.3390/molecules28041938 · Cited by 5 · see citing works
- Authors
- de Asha, A. M., & Nix, R. M.
- Venue
- Journal of the Chemical Society, Faraday Transactions
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 1995
- Volume
- 91
- Issue
- 20
- Pages
- 3611
- ISSN
- 0956-5000 (ISSN-L)
- 1364-5455
- OpenAlex
- W2058564478
- Cited by
- 10
- References
- 0
- Citations by year
- 2023: 1 · 2016: 1
- FWCI
- 0.67
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the Chemical Society Faraday Transactions (publishedVersion)
- Topics
- Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Physical Sciences › Chemical Engineering › Catalysis › Catalysis and Oxidation Reactions
- Keywords
- CO2 adsorption, Cu(111) substrate, surface oxidation, carbonate complexes, CO2 dissociation, work function change, film thickness effects, oxygen vacancies, methanol synthesis
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