Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: Poster Session - Oxides and Insulators: Adsorption and Reaction of Small Molecules

O 53.1: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/1OG

Investigation of Proton Conductivity in Yttria Stabilized Zirconia Thin Films by Electrochemical Impedance Spectroscopy — •Lars-Erik Maurer, Erdogan Celik, and Matthias T. Elm — Center for Materials Research, Gießen, Germany

Dense and porous yttria stabilized zirconia (YSZ) thin films were fabricated using pulsed laser deposition in order to investigate the influence of the layer thickness on the electrical and protonic transport properties under dry and wet atmospheres. For that purpose, electrochemical impedance spectroscopy was performed at different temperatures, oxygen partial pressures and relative humidities. Under dry atmospheres, the total conductivity of the thin films is dominated by oxygen vacancies and increases with increasing grain size due to the blocking behavior of the grain boundaries. At wet conditions, the total conductivity of the dense films is reduced which is attributed to an annihiliation of the oxygen vacancies at the surface due to adsorbed water molecules. Only the porous layers exhibits a proton conductivity in wet atmosphere at low temperature and high relative humidity revealing the importance of the pore structure on the surface protonic conductivity of oxide materials.