Journal of Inorganic Materials ›› 2025, Vol. 40 ›› Issue (4): 363-371.DOI: 10.15541/jim20240404

• RESEARCH ARTICLE • Previous Articles     Next Articles

Pr1+xBa1-xFe2O5+δ Cathode Materials for Solid Oxide Fuel Cells: Preparation and Electrochemical Performance

XUE Ke1,2,3(), CAI Changkun1,2,3, XIE Manyi1,2,3, LI Shuting1,2,3, AN Shengli1,2,3()   

  1. 1. School of Rare Earth Industry, Inner Mongolia University of Science and Technology, Baotou 014010, China
    2. Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices, Inner Mongolia University of Science and Technology, Baotou 014010, China
    3. Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, Ministry of Education, Inner Mongolia University of Science and Technology, Baotou 014010, China
  • Received:2024-09-09 Revised:2024-11-08 Published:2025-04-20 Online:2024-11-25
  • Contact: AN Shengli, professor. E-mail: shengli_an@126.com
  • About author:XUE Ke (1994-), male, PhD candidate. E-mail: xue_ke0@126.com
  • Supported by:
    National Natural Science Foundation of China(51974167);Natural Science Foundation of Inner Mongolia(2023QN05038);Higher Education Carbon Peak Carbon Neutral Research Project of Inner Mongolia Autonomous Region(STZX202210)

Abstract:

PrBaFe2O5+δ (PBF) is one of the most promising cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC). Although PBF possesses similar area specific resistance (ASR) to that of Co-based cathode materials, electronic conductivity of PBF is an order of magnitude lower. Up to now, various doping strategies have been reported to enhance the electrochemical performance of this material, but still leaving it an open issue. In this study, PBF and Pr1+xBa1−xFe2O5+δ (PBFx, x=0.01, 0.02, and 0.04) materials were synthesized by replacing Ba in PBF with excessive Pr using a Sol-Gel method, and their electrochemical performances as IT-SOFC cathodes were evaluated. For x=0.01, excessive Pr enters the lattice interstitials of PBF. For x≥0.02, 0.01 (in molar) excessive Pr occupies interstitial sites, while the rest replaces Ba in PBF. Over the temperature range of 650-800 ℃, excessive Pr promotes the conductivity of PBF, and PBF0.01 exhibits the highest conductivity of 109.21 S•cm-1, improving by 76%, which is attributed to the reduction in electronic transport path length. Furthermore, the excessive Pr contributes to lattice stress and dislocation density, reducing oxygen reduction reaction (ORR) activity and slightly increasing ASR of the cathode. Compared to PBF device, the peak power density of the Ni-SDC|SDC|PBF0.01 (SDC: Sm0.2Ce0.8O2-δ) single cell increased by approximately 49%, indicating that excessive Pr can significantly improve the electrochemical performance of cathode materials.

Key words: solid oxide fuel cell, PrBaFe2O5+δ, cathode, electrochemical performance

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