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Applicability of MOS structures in monitoring catalytic properties, as exemplified for monolayer-iron-oxide-coated porous platinum films
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.ORCID iD: 0000-0003-0483-0602
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-1631-4293
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
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2016 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 344, p. 583-590Article in journal (Refereed) Published
Abstract [en]

Metal Oxide Semiconductor (MOS) capacitor devices comprised of monolayer iron oxide-coated as well as non-coated polycrystalline Pt deposited on oxidized silicon carbide substrates have been fabricated and their usefulness as realistic model systems in catalyst studies development was evaluated. The CO oxidation characteristics of both iron oxide- and non-coated Pt catalysts were investigated using mass spectrometry, monitoring the carbon dioxide production rate for different combinations of carbon monoxide (CO) and oxygen concentrations at various temperatures. Additionally, the output capacitance of the MOS model catalysts was recorded for each individual CO oxidation activity. A low-temperature shift in CO oxidation characteristics for the monolayer-coated compared to the non-coated Pt catalysts was observed, similar to that previously reported for monolayer iron oxide grown on single-crystalline Pt substrates. A strong correlation between the output capacitance of the MOS structures and the CO oxidation characteristics was found for both monolayer- and non-coated model catalysts. Furthermore, the devices exhibit retained MOS electrical output and CO oxidation characteristics as well as an unaffected catalyst surface composition, as confirmed by photoelectron spectroscopy, even after 200 h of continuous model catalyst operation. In addition to the implications on practical applicability of monolayer iron oxide coating on widely used polycrystalline Pt films in real-world catalysts and sensors, the findings also point to new possibilities regarding the use of MOS model systems for in situ characterization, high throughput screening, and tailoring of e.g. catalyst- and fuel-cell-electrode materials for specific applications.

Place, publisher, year, edition, pages
Academic Press, 2016. Vol. 344, p. 583-590
Keywords [en]
Monolayer iron oxide, Platinum catalyst, Catalytic activity, CO oxidation, Field effect device, MOS capacitor, CO sensor
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-199751DOI: 10.1016/j.jcat.2016.10.018ISI: 000390182800057Scopus ID: 2-s2.0-84996565999OAI: oai:DiVA.org:kth-199751DiVA, id: diva2:1067700
Note

QC 20170123

Available from: 2017-01-23 Created: 2017-01-16 Last updated: 2017-06-28Bibliographically approved

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Soldemo, MarkusWeissenrieder, Jonas

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