Achieving exceptional activity and durability toward oxygen reduction based on a cobalt-free perovskite for solid oxide fuel cells

Feifei Dong, Zhenghui Gao, Bingkai Zhang, Lu Li, Ziqi Kong, Zilin Ma, Meng Ni, Zhan Lin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

In response to the shortcomings of cobalt-rich cathodes, iron-based perovskite oxides appear as promising alternatives for solid oxide fuel cells (SOFCs). However, their inferior electrochemical performance at reduced temperatures (<700 °C) becomes a major bottleneck for future progress. Here, a novel cobalt-free perovskite Ba0.75Sr0.25Fe0.875Ga0.125O3−δ (BSFG) is developed as an efficient oxygen reduction electrode for SOFCs, featuring cubic-symmetry structure, large oxygen vacancy concentration and fast oxygen transport. Benefiting from these merits, cells incorporated with BSFG achieve exceptionally high electrochemical performance, as evidenced by a low polarization area-specific resistance of 0.074 Ω cm2 and a high peak power density of 1145 mW cm−2 at 600 °C. Meanwhile, a robust short-term performance stability of BSFG cathode can be ascribed to the stable crystalline structure and favorable thermal expansion behavior. First-principles computations are also conducted to understanding the superior activity and durability toward oxygen reduction reaction. These pave the way for rationally developing highly active and robust cobalt-free perovskite-type cathode materials for reduced-temperature SOFCs.

Original languageEnglish
Pages (from-to)653-659
Number of pages7
JournalJournal of Energy Chemistry
Volume62
DOIs
Publication statusPublished - Nov 2021

Keywords

  • Cathode
  • Cobalt-free
  • Oxygen reduction reaction
  • Perovskite
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

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