Oxygen vacancy-engineered cobalt-free Ruddlesden-Popper cathode with excellent CO2 tolerance for solid oxide fuel cells

Daoming Huan, Lu Zhang, Kang Zhu, Xinyu Li, Nai Shi, Yi Yang, Changrong Xia, Yun Xie, Ranran Peng

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Developing efficient and durable cobalt-free cathodes for intermediate temperature solid oxide fuel cells (IT-SOFCs) is indispensable on account of the sluggish oxygen reduction reaction (ORR). In this work, we report our findings in significantly improved ORR kinetics of (SrEu2)0.9Fe2O7-δ ((SE)0.9F) by introducing a 10% A-site deficiency in SrEu2Fe2O7 (SEF) at the atomic scale. Using this cation deficient strategy, sufficient oxygen vacancy concentration in (SE)0.9F lattice (δ = 0.40) is successfully achieved. Moreover, much improved electrical conductivity and promoted catalytic activity toward the ORR are observed in this new catalyst at intermediate temperatures (550–700 °C), which also offers excellent CO2 resistivity. This work demonstrates an integral role of Ruddlesden-Popper oxides in applying as highly efficient and stable cobalt-free cathodes for IT-SOFCs.

Original languageEnglish
Article number229872
JournalJournal of Power Sources
Volume497
DOIs
Publication statusPublished - Jun 15 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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