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Criteria for the application of high temperature proton conductors in SOFCs

✍ Scribed by T Schober; F Krug; W Schilling

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
230 KB
Volume
97
Category
Article
ISSN
0167-2738

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✦ Synopsis

A critical evaluation of high temperature proton conductors (HTPCs) which might be considered in SOFC applications is presented. A comparison of the conductivities of the best oxygen ion conductors with those of prominent HTPCs shows that a few of the latter may possibly compete in the temperature range 500-7008C. The HTPCs considered here were (a) the classical doped SrCeO , (b) doped BaCeO , (c) doped Sr and Ba zirconates, and (d) complex perovskites of type 3 3 Ba Ca Nb O . The compounds favored are those with a high enthalpy of solution of water. Generally, the following 3 1.18 1.82 92d materials parameters are desirable: deviation from exact oxygen stoichiometry d Β―0.05; enthalpy of solution of water eff 2 DH $ 1.5 eV; effective activation energy for proton transport E , 5 0.55 eV and proton transport number t Β―1.

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