Lookup NU author(s): Dr Evangelos Papaioannou,
Dr Daniel Frankel,
Professor Ian Metcalfe
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
A series of microstructured, supported platinum (Pt) catalyst films (supported on single crystal yttria-stabilized zirconia) and an appropriate Pt catalyst reference system (supported on single crystal alumina) were fabricated using pulsed laser deposition and argon etching. The thin films exhibit area-specific lengths of three-phase boundary (length of three-phase boundary between the Pt, support and fluid phase divided by the superficial area of the sample) that vary over four orders of magnitude from 4.5 × 102 m m-2 to 4.9 × 106 m m-2 equivalent to structural lengthscales of 0.2 µm to approximately 9000 µm. The catalyst films are characterised using X-ray diffraction, atomic force microscopy, high-resolution scanning electron microscopy, and catalytic activity tests employing the carbon monoxide oxidation reaction. When Pt is supported on yttria-stabilized zirconia, the reaction rate clearly depends upon the area-specific length of the three-phase boundary, l(tpb). A similar relationship is not observed when Pt is supported on alumina. We tentatively suggest that the presence of the three-phase boundary provides an extra channel of oxygen supply to the Pt through diffusion in or on the yttria-stabilized zirconia support coupled with surface diffusion across the Pt.
Author(s): Papaioannou EI, Bachmann C, Neumeier JJ, Frankel D, Over H, Janek J, Metcalfe IS
Publication type: Article
Publication status: Published
Journal: ACS Catalysis
Online publication date: 22/07/2016
Acceptance date: 11/07/2016
Date deposited: 22/07/2016
ISSN (electronic): 2155-5435
Publisher: American Chemical Society
Data Source Location: http://dx.doi.org/10.17634/081371-1
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