Water Adsorption and Dissociation on Polycrystalline Copper Oxides:Effects of Environmental Contamination and Experimental Protocol
| Autor: | Lena Trotochaud, Bryan W. Eichhorn, Astrid Waldner, Ashley R. Head, Hendrik Bluhm, Line Kyhl, Herman Terryn, Sven Pletincx, Tom Hauffman, Osman Karslıoǧlu, Yi Yu |
|---|---|
| Přispěvatelé: | Materials and Chemistry, Faculty of Engineering, Electrochemical and Surface Engineering, Materials and Surface Science & Engineering |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Copper oxide
Materials science NEAR-AMBIENT CONDITIONS Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology PRESSURE 010402 general chemistry FILMS 01 natural sciences Dissociation (chemistry) Hydroxylation chemistry.chemical_compound Engineering Adsorption X-ray photoelectron spectroscopy Monolayer Materials Chemistry Physical and Theoretical Chemistry SITES MICROSCOPY 021001 nanoscience & nanotechnology Copper HYDROXYLATION REACTIVITY 0104 chemical sciences Surfaces Coatings and Films chemistry MGO(100) SURFACE Chemical Sciences Physical Sciences RAY PHOTOELECTRON-SPECTROSCOPY GROWTH 0210 nano-technology |
| Zdroj: | Trotochaud, L, Head, A R, Pletincx, S, Karslioglu, O, Yu, Y, Waldner, A, Kyhl, L, Hauffman, T, Terryn, H, Eichhorn, B & Bluhm, H 2018, ' Water Adsorption and Dissociation on Polycrystalline Copper Oxides : Effects of Environmental Contamination and Experimental Protocol ', Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical, vol. 122, no. 2, pp. 1000-1008 . https://doi.org/10.1021/acs.jpcb.7b10732 The journal of physical chemistry. B, vol 122, iss 2 Trotochaud, L; Head, AR; Pletincx, S; Karslloǧlu, O; Yu, Y; Waldner, A; et al.(2018). Water Adsorption and Dissociation on Polycrystalline Copper Oxides: Effects of Environmental Contamination and Experimental Protocol. Journal of Physical Chemistry B, 122(2), 1000-1008. doi: 10.1021/acs.jpcb.7b10732. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/3x22780c |
| DOI: | 10.1021/acs.jpcb.7b10732 |
| Popis: | We use ambient-pressure X-ray photoelectron spectroscopy (APXPS) to study chemical changes, including hydroxylation and water adsorption, at copper oxide surfaces from ultrahigh vacuum to ambient relative humidities of similar to 5%. Polycrystalline CuO and Cu2O surfaces were prepared by selective oxidation of metallic copper foils. For both oxides, hydroxylation occurs readily, even at high-vacuum conditions. Hydroxylation on both oxides plateaus near similar to 0.01% relative humidity (RH) at a coverage of similar to 1 monolayer. In contrast to previous studies, neither oxide shows significant accumulation of molecular water; rather, both surfaces show a high affinity for adventitious carbon contaminants. Results of isobaric and isothermic experiments are compared, and the strengths and potential drawbacks of each method are discussed. We also provide critical evaluations of the effects of the hot filament of the ion pressure gauge on the reactivity of gas-phase species, the peak fitting procedure on the quantitative analysis of spectra, and rigorous accounting of carbon contamination on data analysis and interpretation. This work underscores the importance of considering experimental design and data analysis protocols during APXPS experiments with water vapor in order to minimize misinterpretations arising from these factors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|