6th International Conference
on Electroceramics

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Abstract

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RATIONAL APPROACH FOR DESIGNING CATHODE MATERIALS FOR PROTON CONDUCTING ELECTROLYTES OPERATING AT 600°C

Enrico Traversa
Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal
23955-6900, Saudi Arabia enrico.
traversa@kaust.edu.sa

The high cost of solid oxide fuel cells (SOFCs), related to their high operating temperatures, hinders their general use and causes long-term stability problems. Chemically stable high temperature proton conductor oxides are promising electrolytes for operating SOFC at 600°C [1, 2]. However, for such a low temperature efficient cathodes need to be developed to avoid polarization losses [3]. Several good cathode materials have been developed for oxygen-ion conducting electrolytes, and in early works those same materials have been used also for proton conducting electrolytes [4]. Though, using a proton-conducting electrolyte, protons migrate through the electrolyte from the anode to the cathode side, where they react with oxygen ions generating water. Thus, in principle a cathode material that performs well with an oxygen-ion conductor is not adequate for a proton-conducting electrolyte [5, 6]. This work will show the rational approach used to tailor cathode materials with low overpotential, taking into account the different species involved in the cathode reactions. The materials should concurrently possess electron, proton and oxygen-ion conductivities [7]. In fact, the most performing cathode was made of a mixed oxygen-ion/electron conductor and a mixed proton/electron conductor composite [8], which allow extension of the cathode reaction sites to the whole cathode bulk [9].

References [1] E. Fabbri, L. Bi, H. Tanaka, D. Pergolesi, E. Traversa, Adv. Funct. Mater. 21 (2011) 158. [2] E. Fabbri, L. Bi, D. Pergolesi, E. Traversa, Adv. Mater. 24 (2012) 195. [3] E. Fabbri, D. Pergolesi, E. Traversa, Chem. Soc. Rev. 39 (2010) 4355. [4] E. Fabbri, D. Pergolesi, E. Traversa, Sci. Technol. Adv. Mater. 11 (2010) 044301. [5] E. Fabbri, T.K. Oh, S. Licoccia, E. Traversa, E.D. Wachsman, J. Electrochem. Soc. 156 (2009) B38. [6] E. Fabbri, S. Licoccia, E. Traversa, E.D. Wachsman, Fuel Cells 9 (2009) 128. [7] E. Fabbri, I. Markus, L. Bi, D. Pergolesi, E. Traversa, Solid State Ionics 202 (2011) 30. [8] E. Fabbri, L. Bi, J.L.M. Rupp, D. Pergolesi, E. Traversa, RSC Advances 1 (2011) 1183. [9] E. Fabbri, L. Bi, D. Pergolesi, E. Traversa, Energy Environ. Sci. 4 (2011) 4984.


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