Roduner, EmilKittel, Tobias2016-04-222016Kittel, T & Roduner, E 2016, 'Charge polarization at catalytic metal-support junctions : Part B : Theoretical modeling of Kelvin probe force microscopy', The Journal of Physical Chemistry. vol. 120, no. 16, pp. 8917–89261520-6106 (print)1520-5207 (online)10.1021/acs.jpcc.6b00898http://hdl.handle.net/2263/52103Existing models for the analysis of Kelvin probe microscopy experiments are extended and used to analyze the experimental electrical potential profiles for a Pt/TiO2 model nanoparticle. The derived model reproduces in detail the Kelvin probe image that reveals a characteristic ring-shaped negative charge zone at the surface around the particle: A planar negative charge zone at the surface of the support extends beyond the diameter of the Pt particle. It is compensated mostly by a planar layer of positive charges in the metal across the interface, and by a smaller number of positive charges at the metal-air interface. These latter charges determine the positive electrical potential of the metal particle, and they are likely responsible for the extent of the metal-support interaction in catalytic reactions.enThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry A, © 2016 American Chemical Society after peer review and technical editing by the publisher.Noble metal catalysisMetal oxide supportCatalyst-support effectCharge polarizationKelvin probe microscopyPostprint Article