Functionally graded composite electrodes for advanced anode-supported, intermediate-temperature SOFC

Juan L. Sepulveda, Raouf O. Loutfy, Sekyung Chang, Peiwen Li, Ananth Kotwal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This paper describes the development and modeling of anode-supported intermediate-temperature solid oxide fuel cells (ACN-AS-IT-SOFC) that exhibit high electrochemical efficiency, high degree of fuel utilization, and low operating temperature characteristics. The proposed cell design is fuelled by hydrogen or in-situ reformed fuel and operates at a lower temperature of 600-800°C producing a maximum power density of 2-2.2 W/cm 2. The innovative design for the ACN-AS-IT-SOFC fuel cell makes use of a porous anode consisting of a combination of a highly conductive anode capillary network (ACN) running through the supporting anode manufactured using MER poly capillary material technology. The highly porous anode allows for free fuel gas access to the functional anode. Operating at low temperature of 600-800°C it allows the use of less expensive interconnect materials such as ferritic steels. A method to identify over-potentials caused by different polarizations in an SOFC with multi-layer hybrid electrodes is also presented. The contributions of each polarization to the total loss in a fuel cell can be identified. The polarization causing the maximum over-potential is then considered as the primary source of internal losses, and optimization is focused to improve the power density. The analysis for the mass transfer polarization considers bulk convection and diffusion in porous layers from bulk flow to the interface of the electrode and electrolyte. Values of the exchange current densities are determined empirically by matching analytical and experimental results. Effects of porosities and thicknesses of anode, cathode, and functional graded layers are modeled and optimized to attain maximum power density.

Original languageEnglish (US)
Title of host publicationCeramic Engineering and Science Proceedings
Pages203-214
Number of pages12
Volume29
Edition5
StatePublished - 2009
EventAdvances in Solid Oxide Fuel Cells IV - 32nd International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: Jan 27 2008Feb 1 2008

Other

OtherAdvances in Solid Oxide Fuel Cells IV - 32nd International Conference on Advanced Ceramics and Composites
CountryUnited States
CityDaytona Beach, FL
Period1/27/082/1/08

Fingerprint

Solid oxide fuel cells (SOFC)
Anodes
Electrodes
Composite materials
Temperature
Polarization
Fuel cells
Gas fuels
Ferritic steel
Electrolytes
Hydrogen
Ion exchange
Cathodes
Current density
Mass transfer
Porosity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Sepulveda, J. L., Loutfy, R. O., Chang, S., Li, P., & Kotwal, A. (2009). Functionally graded composite electrodes for advanced anode-supported, intermediate-temperature SOFC. In Ceramic Engineering and Science Proceedings (5 ed., Vol. 29, pp. 203-214)

Functionally graded composite electrodes for advanced anode-supported, intermediate-temperature SOFC. / Sepulveda, Juan L.; Loutfy, Raouf O.; Chang, Sekyung; Li, Peiwen; Kotwal, Ananth.

Ceramic Engineering and Science Proceedings. Vol. 29 5. ed. 2009. p. 203-214.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sepulveda, JL, Loutfy, RO, Chang, S, Li, P & Kotwal, A 2009, Functionally graded composite electrodes for advanced anode-supported, intermediate-temperature SOFC. in Ceramic Engineering and Science Proceedings. 5 edn, vol. 29, pp. 203-214, Advances in Solid Oxide Fuel Cells IV - 32nd International Conference on Advanced Ceramics and Composites, Daytona Beach, FL, United States, 1/27/08.
Sepulveda JL, Loutfy RO, Chang S, Li P, Kotwal A. Functionally graded composite electrodes for advanced anode-supported, intermediate-temperature SOFC. In Ceramic Engineering and Science Proceedings. 5 ed. Vol. 29. 2009. p. 203-214
Sepulveda, Juan L. ; Loutfy, Raouf O. ; Chang, Sekyung ; Li, Peiwen ; Kotwal, Ananth. / Functionally graded composite electrodes for advanced anode-supported, intermediate-temperature SOFC. Ceramic Engineering and Science Proceedings. Vol. 29 5. ed. 2009. pp. 203-214
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