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- W2034844557 abstract "Abstract Different composite materials made of mixed protonic/electronic conductors, SrCe 0.9 Yb 0.1 O 3–δ (10YbSC) or BaCe 0.9 Yb 0.1 O 3–δ (10YbBC), and a mixed oxygen‐ion/electronic conductor, La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF), were investigated for cathode application in intermediate temperature solid oxide fuel cells (IT‐SOFCs) using a high temperature proton conducting BaCe 0.8 Y 0.2 O 3–δ electrolyte. Only the LSCF/10YbBC composite was found to be chemically stable. Area specific resistance (ASR) measurements were performed in wet air for LSCF/10YbBC cathodes, changing the weight ratio between the phases and the sintering procedure. The best performance was obtained for the composite cathode containing 50 wt.‐% of LSCF and 50 wt.‐% of 10YbBC, sintered at 1,100 °C. Electrochemical impedance spectroscopy (EIS) measurements of the tested cathodes showed two depressed semicircles in the middle and low frequency range, respectively. Performing ASR measurements at different p allowed us to attribute the two semicircles to charge transfer and oxygen diffusion processes, respectively. The microstructure of the LSCF/10YbBC(1:1) composite cathode was optimised changing the ratio of the particle sizes between the two phases. The lowest ASR values (0.14 Ω cm 2 at 700 °C) were observed for the LSCF/10YbBC(1:1) composite cathode with different particle size (sub‐micrometer particles for LSCF and nanometer particles for 10YbBC). Fuel cell polarisation curves demonstrated superior performance of the LSCF/10YbBC (1:1) cathode with respect to Pt." @default.
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- W2034844557 date "2009-04-01" @default.
- W2034844557 modified "2023-10-15" @default.
- W2034844557 title "Composite Cathodes for Proton Conducting Electrolytes" @default.
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- W2034844557 doi "https://doi.org/10.1002/fuce.200800126" @default.
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