CO2-induced reconstruction for ORR-enhanced solid oxide fuel cell cathode

Yuan Zhang, Junbiao Li, Heping Xie, Zhipeng Liu, Suling Shen, Ying Teng, Daqin Guan, Shuo Zhai, Yufei Song, Wei Zhou, Bin Chen, Meng Ni, Zongping Shao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Solid oxide fuel cell (SOFC) cathode must be highly active and durable for electrochemical oxygen reduction reaction (ORR). Here, we demonstrate a CO2-induced reconstruction strategy to build an oxygen incorporative but robust BaCO3 shell for a self-assembled composite cathode from simple BaFeO3-δ perovskite (noted as re-BF), leading to the enhanced ORR activity, durability, and thermomechanical compatibility. The heterostructure beneath the BaCO3 shell consists of a BaFeO3 phase and a BaFe2O4 phase, of which BaFeO3 sustains the re-BF with good bulk oxygen transportation. The BaFe2O4 phase is stable with low thermal expansion coefficient, serving as a reinforced phase to re-BF for better chemical/morphological integrity. This new re-BF cathode shows good durability and a low area-specific resistance (ASR) of 0.013 Ω cm2, about only one-third of pristine BaFeO3-δ (0.041 Ω cm2) at 650 °C. This method can also be extended to other perovskite materials to develop an active catalyst for SOFC cathode.

Original languageEnglish
Article number142216
JournalChemical Engineering Journal
Volume462
DOIs
Publication statusPublished - 15 Apr 2023

Keywords

  • Carbon dioxide
  • Cathode
  • Oxygen reduction reaction
  • Reconstruction
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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