A collaborative study of sintering and composite effects for a PrBa 0.5Sr0.5Co1.5Fe0.5O 5+δ IT-SOFC cathode
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- A collaborative study of sintering and composite effects for a PrBa 0.5Sr0.5Co1.5Fe0.5O 5+δ IT-SOFC cathode
- Park, Seonhye; Choi, Sinhyuk; Shin, Jeeyoung; Kim, Guntae
- Area-specific resistances; Electrical transport properties; Electrochemical performance; Electrochemical reactions; Heat treatment conditions; Intermediate temperature solid oxide fuel cell; Mixed ionic and electronic conductors; Sintering and composites
- Issue Date
- ROYAL SOC CHEMISTRY
- RSC ADVANCES, v.4, no.4, pp.1775 - 1781
- Recently, a novel cathode material PrBa0.5Sr 0.5Co1.5Fe0.5O5+δ (PBSCF) has been proposed as a solution to overcome the drawbacks of a conventional cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Here we report systematic procedures to optimize the sintering temperature and the composite for PBSCF as an IT-SOFC cathode. For optimization of the heat treatment conditions for a PBSCF composite cathode, the effects of sintering temperature on the microstructure and electrical transport properties of the material are examined. We also suggest the optimization processes to effectively expand the electrochemical reaction zone based on a combination of a mixed ionic and electronic conductor (MIEC) electrode and an ionically conducting phase (PBSCF-Ce0.9Gd0.1O1.95 (GDC)x, x = 0, 20, 40, 50, and 60 wt%). The optimal intersection point between these two processing systems is revealed to be 50 wt% of GDC containing a composite cathode sintered at 950 °C for 4 h. The area specific resistance (ASR) of PBSCF-GDC50 sintered at 950 °C for 4 h reaches a minimum value of 0.052 Ω cm 2 at 600 °C, which is consistent with the electrochemical performance results representing peak power density of ∼2.0 W cm -2 at 600 °C.
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