Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Fundamentals of Catalysis II

O 82.11: Vortrag

Donnerstag, 4. April 2019, 17:30–17:45, H5

Electrical and Protonic Conductivity of Surface Modificated Porous Yttria-Stabilized Zirconia (YSZ) Thin Films — •Erdogan Celik and Matthias T. Elm — Center for Materials Research, Justus-Liebig-University Gießen, Germany, Heinrich-Buff-Ring 16, 35392 Gießen

Porous yttria-stabilized zirconia (YSZ) thin films were prepared using pulsed laser deposition in order to investigate the influence of the high surface area on the electrical transport properties. Electrochemical impedance spectroscopy was carried out as a function of temperature, oxygen activity and humidity of the surrounding atmosphere. At high humidity protons on the surface of the porous YSZ thin films lead to an increased conductivity, especially at low temperatures. By coating the porous YSZ films with a titania (TiO2) film of only a few nanometers, the protonic contribution to the conductivity at low temperatures is completely suppressed revealing the large influence of the surface on the transport properties of porous materials.