Promoted Cr-poisoning tolerance of La2NiO4+δ-coated PrBa0.5Sr0.5Co1.5Fe0.5O5+δ cathode for intermediate temperature solid oxide fuel cells
Cr-poisoning effect on pure double-perovskite PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) cathode and La 2 NiO 4+δ (LN)-coated PBSCF cathode is investigated. During the Cr poisoning test at 750 °C in the presence of SUS430 interconnect, the electrochemical performance of pure PBSCF cathode shows severe degradation, and the significant increase in R P is mainly contributed by the increased R L . The BaCrO 4 deposits are identified on the PBSCF cathode surface. LN-coated PBSCF cathode, by contrast, shows remarkable tolerance towards chromium. The reaction between volatile Cr species and PBSCF cathode can be prevented by a dense LN coating. Thus, a more stable electrochemical performance is achieved by LN-coated cathode during the Cr poisoning test. The results indicate that the introduction of LN coating not only improves the cathode electrochemical performance, but also prevents the cathode from being poisoned by chromium.
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