Effect of nonequivalent substitution of Pr3+/4+ with Ca2+ in PrBaCoFeO5+δ as cathodes for IT-SOFC
Source abstract
Abstract
We used a Ca doping strategy with PrBaCoFeO5+δ (PBCF) to prepare a novel double-perovskite Pr1–xCaxBaCoFeO5+δ (PCBCF). x = 0.05 and x = 0.1 samples exhibited a single phase with layered double-perovskite structure, combined with good chemical compatibility with common electrolyte materials. X-ray photoelectron spectroscopy profiles of PCBCF were compared to that of PBCF to detect differences in oxidation states. The substitution of Ca2+ for Pr ions in PCBCF effectively reduces the thermal expansion coefficient and material costs. Though the introduction of Ca2+ reduced the electrical conductivity, it improved the oxygen catalytic activity. The improved electrochemical performance was attributed to the increased oxygen vacancy concentration in the lattice. The optimal composition x = 0.1 cathode exhibited the best catalytic activity and durability. The polarization impedance and maximum power density of the 0.1 cathode were 0.027 Ω cm2 and 728 mW cm−2 at 800 °C, respectively. Distribution of relaxation time analysis demonstrated that the 0.1 cathode electrochemical reactions under oxygen partial pressures involved at least three processes and confirmed that the transfer process of oxide ions and charge transfer process are the major rate-determining steps of the oxygen reduction reaction. The combination of experimental and analysis results indicated that the 0.1 sample has considerable potential as part of a cathode for application in intermediate-temperature solid oxide fuel cells.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (52)
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