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A-Site Engineering of the High-Entropy Perovskite PrLaBaSrCaFeO Cathode for Intermediate-Temperature SOFCs. | LitMetric

A-Site Engineering of the High-Entropy Perovskite PrLaBaSrCaFeO Cathode for Intermediate-Temperature SOFCs.

ACS Appl Mater Interfaces

Key Laboratory of Fuel Cell Materials and Devices, School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China.

Published: July 2024

AI Article Synopsis

  • - Mixed-oxygen ionic and electronic conduction is essential for solid oxide fuel cell cathodes, but traditional Fe-based materials show low conductivity, hindering performance.
  • - The new high-entropy perovskite oxide, PrLaBaSrCaFeO (PLBSCF), improves conductivity and oxygen vacancy concentration compared to the previous PBF material, greatly reducing resistance and improving cell efficiency.
  • - PLBSCF demonstrates excellent cell performance, achieving a peak power density of 0.853 W·cm at 750 °C and maintaining durability over 100 hours, with enhanced oxygen reaction processes contributing to these improvements.

Article Abstract

Mixed-oxygen ionic and electronic conduction is crucial for the cathode materials of solid oxide fuel cells, ensuring high efficiency and low-temperature operation. However, the electronic and oxygen ionic conductivity of traditional Fe-based layered perovskite cathode materials is low, resulting in insufficient oxygen reduction reactivity. Herein, a type of high-entropy perovskite oxide consisting of five equimolar metals, PrLaBaSrCaFeO (PLBSCF), a high-performance cobalt-free cathode derived from the PrBaFeO (PBF), is proposed. Such A-site engineering could not only increase the oxygen vacancy concentration of PLBSCF but also give higher conductivity than PBF, thus significantly reducing the polarization impedance of the symmetric cell to only 0.052 Ω·cm at 750 °C. The good output performance of a single cell is also realized. The peak power density of the single cell with PLBSCF-CeGdO (GDC) as the cathode at 750 °C was 0.853 W·cm. Additionally, the single cell with the PLBSCF cathode exhibits a good durable performance of 100 h at 750 °C. Combining the distribution of relaxation time analysis, it can be seen that the enhancement of the oxygen reduction reaction is due to the reduction of intermediate-frequency and low-frequency resistance, indicating an improvement in the charge transfer process and adsorption/dissociation process of molecular oxygen.

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Source
http://dx.doi.org/10.1021/acsami.4c02957DOI Listing

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