A new cobalt-free composite cathode Pr0.6Sr0.4Cu0.2Fe0.8O3−δ-Ce0.8Sm0.2O2−δ for proton-conducting solid oxide fuel cells

Abstract Pr 0.6 Sr 0.4 Cu 0.2 Fe 0.8 O 3−δ -Ce 0.8 Sm 0.2 O 2−δ (PSCF-SDC) (70:30 wt.%), a new cobalt-free composite cathode, is investigated for BaZr 0.3 Ce 0.5 Y 0.2 O 3−δ -based proton-conducting solid oxide fuel cells (H-SOFCs). The influence of firing temperature on cathode microstructure and electrochemical performance of fuel cells is researched and analyzed. These results show that the optimum sintering temperature of PSCF-SDC composite cathode is 800 °C. The low polarization resistance of 0.14 Ω cm 2 and the maximum power density of 456 mW cm −2 are achieved at 650 °C. Cell performance is further enhanced when the BaZr 0.3 Ce 0.5 Y 0.2 O 3−δ electrolyte is replaced by BaZr 0.1 Ce 0.7 Y 0.2 O 3−δ with higher proton conductivity; resulting in an improved maximum power density of 556 mW cm −2 at 650 °C.

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