Dresden 2009 – wissenschaftliches Programm
DS 16.33: Poster
Dienstag, 24. März 2009, 09:30–12:30, P5
Cerium oxide-based thin nanocrystalline Solid Oxide Fuel Cell electrolyte films — •Petr Straumal1,2, Ata Myatiev2, Sergiy Divinski1, and Gerhard Wilde1 — 1Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany — 2Moscow Institute of Steel and Alloys (Technological University), Leninsky Prospect 4, 119049 Moscow, Russia
Solid oxides fuel cells can have very high efficiencies in converting chemical energy to electrical energy (70-80%). However, there are some problems with existing materials, namely, high operation temperature (900-1000°C), high manufacture costs. Conventional electrolyte materials (as Zr oxide doped with metals like Y, Ca, Sc Yb, Sm), have reached their limit. New materials are needed with enhanced ionic conductivity and catalytic activities. Ionic conductivity in conventional solid electrolytes is limited by lattice diffusion. Nanoscaled and nanocrystalline materials may be a solution due to the abundance of grain boundaries.
This work studies the conductivity and nanostructure of thin nanocrystalline cerium oxide-based electrolyte films which may be the answer to this challenge. The oxide films are produced using a novel deposition method from metal-organic precursors at relatively low (400-500°C) temperatures. The cerium oxide was doped by bismuth and gadolinium. The conductivity was measured using impedance spectroscopy and the structure was investigated using TEM.