Investigation of Oxygen Reactions in a Screen-printed Pt/YSZ-Model Electrode System

Titelangaben

Zheng, Yingjing ; Sauter, Ulrich ; Dormann, Carina ; Oehler, Gudrun ; Streeb, Martin ; Sahner, Kathy ; Kunz, Lothar ; Glanz, Uwe ; Moos, Ralf:
Investigation of Oxygen Reactions in a Screen-printed Pt/YSZ-Model Electrode System.
2013
Veranstaltung: 224th ECS Meeting , 27.10.-01.11.2013 , San Francisco, USA.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )

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Abstract

Understanding the electrochemical system consisting of platinum and yttria-stabilized zirconia oxide (YSZ) is important for the development of oxygen sensors and solid oxide fuel cells (SOFC). In order to investigate the O2/Pt/YSZ-system in detail, model electrodes with defined geometry have been fabricated by screen-printing platinum with a small amount of aluminum oxide on YSZ-substrate. Although the model electrodes are visually dense, having only some closed pores, we have observed phenomena indicating oxygen transport through the electrode bulk, most likely along grain boundaries. A model that includes two transport paths, surface diffusion and grain boundary diffusion, is proposed.