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Methanol on Co(0 0 0 1): XPS, TDS, WF and LEED results
Laboratory of Physics, Helsinki University of Technology.ORCID-id: 0000-0001-7279-6528
Laboratory of Physics, Helsinki University of Technology.
Laboratory of Physics, Helsinki University of Technology.
2005 (Engelska)Ingår i: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 598, nr 1-3, s. 128-135Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The adsorption and decomposition of methanol on clean Co(0 0 0 1) was studied as a function of temperature and exposure by means of TDS (thermal desorption spectroscopy), XPS (X-ray photoelectron spectroscopy), WF (work function measurements) and LEED (low energy electron diffraction). Methanol was adsorbed by OH-bond scission as methoxide on the cobalt surface. TD and XP spectra revealed that beside a small amount of molecularly desorbing methanol, it decomposed during heating to the final products: CO and H2. Desorption of H2 took place around 356 K and desorption of CO around 390 K. These temperatures are characteristic for desorption of these species on clean cobalt. Work function measurements showed that the adsorption of methanol resulted in a lowering of the WF by 1.1 eV. Heating - and therewith decomposition - led to an increase in the WF of +0.4 eV. After all decomposition products had desorbed, the WF returned to the value for the clean Co(0 0 0 1) surface. LEED exhibited a combination of two ordered structures: p(2 × 2) and (7×7)19.1°. The (7×7)19.1° pattern was formed by methoxide or hydrogen and vanished below 340 K. The p(2 × 2) structure was still found above 380 K and was therefore assigned to CO

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2005. Vol. 598, nr 1-3, s. 128-135
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URN: urn:nbn:se:ltu:diva-12086DOI: 10.1016/j.susc.2005.08.033Lokalt ID: b25c5952-2670-40bf-92f5-677b8e650a42OAI: oai:DiVA.org:ltu-12086DiVA, id: diva2:985036
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Upprättat; 2005; 20160425 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

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