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Protecting metallic PEMFC bipolar plates

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
199 KB
Volume
2002
Category
Article
ISSN
1464-2859

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โœฆ Synopsis

Intermediate TiO 2 layer stabilizes Pt anode catalyst in H 2 S SOFC

Supported Pt anode catalyst in a hydrogen sulfide SOFC with YSZ electrolyte was examined at 700-900ยฐC. Increasing the anode feed H 2 S concentration did not improve the cell performance, due to Pt anode corruption; reversible formation and decomposition of PtS on the Pt/YSZ interface led to Pt/YSZ electrochemical interface instability. Membrane structure and performance were stabilized by interposing a thin TiO 2 layer between the Pt and YSZ. The stabilized open-circuit voltage depended on anode and cathode feed gas flow rates. This behavior is attributed to reactant crossover, changing the partial pressures of product SO 2 and H 2 O.

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