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Thermal Stability o...
Thermal Stability of Single-Crystalline IrO2(110) Layers : Spectroscopic and Adsorption Studies
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- Abb, Marcel J.S. (author)
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany; Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
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- Weber, Tim (author)
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany; Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
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- Langsdorf, Daniel (author)
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany; Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
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- Koller, Volkmar (author)
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany; Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
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- Gericke, Sabrina M. (author)
- Lund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Combustion Physics, Lund University, Box 118, S-22100 Lund, Sweden
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- Pfaff, Sebastian (author)
- Lund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Combustion Physics, Lund University, Box 118, S-22100 Lund, Sweden
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- Busch, Michael (author)
- Chalmers University of Technology,Division Chemical Physics Department of Physics and Competence Centre for Catalysis, Chalmersplatsen 4, SE-41296 Göteborg, Sweden
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- Zetterberg, Johan (author)
- Lund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Combustion Physics, Lund University, Box 118, S-22100 Lund, Sweden
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- Preobrajenski, Alexei (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,MAX IV Laboratory, E120057, Fontongatan 2, 22484 Lund, Sweden
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- Grönbeck, Henrik (author)
- Chalmers University of Technology,Division Chemical Physics Department of Physics and Competence Centre for Catalysis, Chalmersplatsen 4, SE-41296 Göteborg, Sweden
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- Lundgren, Edvin (author)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Synchrotron Radiation Research, Lund University, Box 118, S-22100 Lund, Sweden
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- Over, Herbert (author)
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany; Center for Materials Research, Justus Liebig University, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
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(creator_code:org_t)
- 2020-06-22
- 2020
- English 13 s.
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In: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 124:28, s. 15324-15336
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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Abstract
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- The interaction of ultrathin single-crystalline IrO2(110) films with the gas phase proceeds via the coordinatively unsaturated sites (cus), in particular Ircus, the undercoordinated oxygen species on-top O (Oot) that are coordinated to Ircus, and bridging O (Obr). With the combination of different experimental techniques, such as thermal desorption spectroscopy, scanning tunneling microscopy (STM), high-resolution core-level spectroscopy (HRCLS), infrared spectroscopy, and first-principles studies employing density functional theory calculations, we are able to elucidate surface properties of single-crystalline IrO2(110). We provide spectroscopic fingerprints of the active surface sites of IrO2(110). The freshly prepared IrO2(110) surface is virtually inactive toward gas-phase molecules. The IrO2(110) surface needs to be activated by annealing to 500-600 K under ultrahigh vacuum (UHV) conditions. In the activation step, Ircus sites are liberated from on-top oxygen (Oot) and monoatomic Ir metal islands are formed on the surface, leading to the formation of a bifunctional model catalyst. Vacant Ircus sites of IrO2(110) allow for strong interaction and accommodation of molecules from the gas phase. For instance, CO can adsorb atop on Ircus and water forms a strongly bound water layer on the activated IrO2(110) surface. Single-crystalline IrO2(110) is thermally not very stable although chemically stable. Chemical reduction of IrO2(110) by extensive CO exposure at 473 K is not observed, which is in contrast to the prototypical RuO2(110) system.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
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Abb, Marcel J.S.
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Weber, Tim
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Langsdorf, Danie ...
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Koller, Volkmar
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Gericke, Sabrina ...
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Pfaff, Sebastian
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Busch, Michael
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Zetterberg, Joha ...
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Preobrajenski, A ...
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Grönbeck, Henrik
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Lundgren, Edvin
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Over, Herbert
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Journal of Physi ...
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Lund University
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Luleå University of Technology