Hydrogen Oxidation on Stepped Rh Surfaces: µm-Scale versus Nanoscale

M Datler; I Bespalov; S Buhr; J Zeininger; M Stöger-Pollach; J Bernardi; G Rupprechter; Y Suchorski

doi:10.1007/s10562-016-1824-4

Hydrogen Oxidation on Stepped Rh Surfaces: µm-Scale versus Nanoscale

Catal Letters. 2016;146(10):1867-1874. doi: 10.1007/s10562-016-1824-4. Epub 2016 Aug 23.

Authors

M Datler¹, I Bespalov¹, S Buhr¹, J Zeininger¹, M Stöger-Pollach², J Bernardi², G Rupprechter¹, Y Suchorski¹

Affiliations

¹ 1Institute of Materials Chemistry, Technische Universität Wien, 1060 Vienna, Austria.
² 2University Service Center for Transmission Electron Microscopy, Technische Universität Wien, 1060 Vienna, Austria.

Abstract

Abstract: The catalytic H₂ oxidation reaction on stepped Rh surfaces in the 10^-6 mbar pressure range was studied in situ on individual high-Miller-index domains of a polycrystalline Rh foil by PEEM (photoemission electron microscopy) and on a Rh nanotip by FIM/FEM (field-ion/field-emission microscopy). The activity, particularly the tolerance to poisoning by oxygen, was found to strongly depend on the density of steps and defects, as well as on the size of the catalytically active surfaces.

Keywords: Field emission microscopy; Hydrogen oxidation; Photoemission electron microscopy; Rhodium.