Applicability of MOS structures in monitoring catalytic properties, as exemplified for monolayer-iron-oxide-coated porous platinum films

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Applicability of MOS structures in monitoring catalytic properties, as exemplified for monolayer-iron-oxide-coated porous platinum films

Fashandi, Hossein (author): Linköpings universitet,Tillämpad sensorvetenskap,Tekniska fakulteten

Soldemo, Markus (author): KTH,Materialfysik, MF,KTH Royal Institute Technology, Sweden

Weissenrieder, Jonas (author): KTH,Materialvetenskap,KTH Royal Institute Technology, Sweden

Gothelid, Mats (author): KTH,Materialteknologi,KTH Royal Institute Technology, Sweden

Eriksson, Jens (author): Linköpings universitet,Tillämpad sensorvetenskap,Tekniska fakulteten

Eklund, Per (author): Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten

Lloyd Spetz, Anita (author): Linköpings universitet,Tillämpad sensorvetenskap,Tekniska fakulteten

Andersson, Mike (author): Linköpings universitet,Tillämpad sensorvetenskap,Tekniska fakulteten

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Elsevier, 2016
2016
English.
In: Journal of Catalysis. - : Elsevier. - 0021-9517 .- 1090-2694. ; 344, s. 583-590

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Journal article (peer-reviewed)

Abstract Subject headings

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.

Subject headings

TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Keyword

Monolayer iron oxide
Platinum catalyst
Catalytic activity
CO oxidation
Field effect device
MOS capacitor
CO sensor
Materialteknik
Materials Engineering

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By the author/editor: Fashandi, Hossei ...; Soldemo, Markus; Weissenrieder, J ...; Gothelid, Mats; Eriksson, Jens; Eklund, Per; show more...; Lloyd Spetz, Ani ...; Andersson, Mike; show less...

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

Articles in the publication: Journal of Catal ...

By the university: Karlstad University; Royal Institute of Technology; Linköping University

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