A cobalt-free Pr6O11–BaCe0.2Fe0.8O3-δ composite cathode for protonic ceramic fuel cells with promising oxygen reduction activity and hydration ability

Xuanlin Lu, Zhi Yang, Jian Zhang, Xin Zhao, Jiaxuan Chen, Wen Liu, Yicheng Zhao*, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Oxygen reduction and proton conduction originated from hydration are two key steps in the cathode process of protonic ceramic fuel cells. In this work, Pr6O11 is impregnated into a cobalt-free BaCe0.2Fe0.8O3-δ cathode, resulting in an improved activity of lattice oxygen and a moderate enhancement of the electrical conductivity, both of which are beneficial for charge transfer, the rate-determining step of oxygen reduction process at the cathode. The polarization resistance of bare BaCe0.2Fe0.8O3-δ cathode for oxygen reduction is 0.115 Ω cm2 at 700 °C, which is reduced significantly to 0.039 Ω cm2 with the addition of 30 wt% Pr6O11. Besides, the hydration ability of the cathode is also improved with Pr6O11, and thus the combination of proton and oxygen is facilitated. A single cell with 30 wt% Pr6O11-70 wt% BaCe0.2Fe0.8O3-δ composite cathode exhibits the highest maximum power density of 1406 mW cm−2 at 700 °C. The composite cathode also shows a good stability.

Original languageEnglish
Article number234233
JournalJournal of Power Sources
Volume599
Early online date20 Feb 2024
DOIs
Publication statusPublished - 15 Apr 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Barium ferrite
  • Cathode
  • Hydration
  • Oxygen reduction
  • Praseodymium oxide
  • Proton-conducting solid oxide fuel cells

Fingerprint

Dive into the research topics of 'A cobalt-free Pr6O11–BaCe0.2Fe0.8O3-δ composite cathode for protonic ceramic fuel cells with promising oxygen reduction activity and hydration ability'. Together they form a unique fingerprint.

Cite this