Solid Oxide Fuel Cell Materials and Kinetics

  • Zachau-Christiansen, Birgit, (Project Manager)
  • Jacobsen, Torben, (Project Participant)
  • Skaarup, Steen, (Project Participant)
  • Bay, Lasse, (Project Participant)

Project Details

Description

The project is a subproject in the danish DK-SOFC Programme.
In Solid Oxide Fuel Cells (SOFC) operating at 1000 degrees C non-stoichiometric oxide are applied as electrode and interconnect materials. The electronic and ionic transport properties of these materials depend on the oxygen stoichiometry and will therefore change with the load in SOFC operation.
In this project the oxygen stoichiometry
of SOFC related materials is determined as function of oxygen partial pressure, or electrode potential. The measurements are performed by Slow Potential Scan technique on oxygen pumping cells in the temperature range 800-1000 degrees C.
The SOFC electrode reactions proceed along the three phase boundary where the gas phase is in contact with the electrode and the electrolyte. The reaction mechanisms, including problems like the width of the reaction zone, is studied by electrochemical techniques as linear sweep voltammetry and impedance spectroscopy on electrodes of simple geometry, point electrodes combined with model calculations.
StatusFinished
Effective start/end date01/01/199031/12/2000