Journal article

Role of the Three-Phase Boundary of the Platinum-Support Interface in Catalysis: A Model Catalyst Kinetic Study


Authors listPapaioannou, EI; Bachmann, C; Neumeier, JJ; Frankel, D; Over, H; Janek, J; Metcalfe, IS

Publication year2016

Pages5865-5872

JournalACS Catalysis

Volume number6

Issue number9

ISSN2155-5435

eISSN2155-5435

Open access statusHybrid

DOI Linkhttps://doi.org/10.1021/acscatal.6b00829

PublisherAmerican Chemical Society


Abstract
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 ion-beam etching. The thin films exhibit area specific lengths of the three-phase boundary (length of three-phase boundary between the Pt, support, and gas phase divided by the superficial area of the sample) that vary over 4 orders of magnitude from 4.5 X 10(2) to 4.9 X 10(6) m m(-2), equivalent to structural length scales of 0.2 mu m to approximately 9000 mu m. The catalyst films have been characterized 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 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.



Citation Styles

Harvard Citation stylePapaioannou, E., Bachmann, C., Neumeier, J., Frankel, D., Over, H., Janek, J., et al. (2016) Role of the Three-Phase Boundary of the Platinum-Support Interface in Catalysis: A Model Catalyst Kinetic Study, ACS Catalysis, 6(9), pp. 5865-5872. https://doi.org/10.1021/acscatal.6b00829

APA Citation stylePapaioannou, E., Bachmann, C., Neumeier, J., Frankel, D., Over, H., Janek, J., & Metcalfe, I. (2016). Role of the Three-Phase Boundary of the Platinum-Support Interface in Catalysis: A Model Catalyst Kinetic Study. ACS Catalysis. 6(9), 5865-5872. https://doi.org/10.1021/acscatal.6b00829


Last updated on 2025-10-06 at 10:39