High-Performance Molybdenum Dioxide (MoO2)-Based Anode for Liquid Hydrocarbon-Fueled SOFC

M.G. Norton, B.W. Kwon, S. Ha
Washington State University, US

Keywords: fuel cells, SOFC, anode, liquid fuels

Summary:

Solid oxide fuel cells, which typically operate in the range 600-1000°C, can be operated with a variety of fuels, such as liquid hydrocarbons and synthetic liquid bio-fuels. We have successfully fabricated MoO2-based anodes with excellent coking resistance for liquid hydrocarbons such as n-dodecane, which is a model compound for jet A fuel, at operating temperature of 750°C. The fabrication method developed in our group uses a combination of electrostatic spray deposition (ESD) and painting to make the anode. In general, SOFC anodes are required to go through sintering steps that increase the density of the layers and consolidate them to achieve good contact and bonding between particles. However, the MoO2-based anode does not need the presintering processes because it is sintered in situ during the operation of the cells. Therefore, the MoO2-based anode can save energy and reduce the cost associated with the sintering steps. We have obtained stabilized power densities from our MoO2-based SOFC of 2000 mW/cm2 at 0.6V using n-dodecane as fuel. The MoO2-based anode is found to be highly coke resistant and also exhibits significantly higher long-term stability when compared to Ni-based anodes.