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Supported Pt anode catalyst in a hydrogen sulfide SOFC with YSZ electrolyte was examined at 700-900Β°C. 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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## Thin-film electrocatalyst for unitized regenerative PEMFCs Thin-film electrocatalyst layers with varying PTFE and Nafion contents for unitized regenerative PEM fuel cells (URFCs) made using the paste method were examined as URFC electrodes. Adding Ir catalyst to the oxygen electrode layer signif
Equations are derived from a generic, transient PEMFC contamination model to predict the effect of CO contaminant concentration in H 2 on both steady state performance losses and time constants. The resulting predictions allowed determination of the CO tolerance limit for the cases of a Pt and WC ca