A Stable and Efficient Cathode for Fluorine-Containing Proton-Conducting Solid Oxide Fuel Cells

Yun Xie, Nai Shi, Daoming Huan, Wenzhou Tan, Junfa Zhu, Xusheng Zheng, Haibin Pan, Ranran Peng, Changrong Xia

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Substitution of anions such as F and Cl can effectively improve the stability of proton-conducting electrolytes at no expense to proton conduction. However, during operation, F and Cl in electrolytes can transfer to the cathodes, which reduces the stability of the electrolytes. In this work, F-doped Ba0.5Sr0.5Co0.8Fe0.2O3−δ [Ba0.5Sr0.5Co0.8Fe0.2O2.9−δF0.1 (F-BSCF)] was prepared as a potential cathode for proton-conducting solid oxide fuel cells with BaCe0.8Sm0.2F0.1O2.85 electrolyte. The incorporation of F in the cathode depressed F diffusion from the electrolyte and improved the stability of button cells. Temperature-changing X-ray photoelectron spectroscopy and electronic conductivity relaxation results demonstrated that the incorporation of F enhanced the oxygen incorporation kinetics at intermediate temperatures and improved the cathode catalytic performance. Moreover, a button cell prepared with this novel cathode was stable for 270 h at a current density of 300 mA cm−2 and 700 °C, which was much superior than those containing a BSCF cathode.

Original languageEnglish
Pages (from-to)3423-3430
Number of pages8
JournalChemSusChem
Volume11
Issue number19
DOIs
Publication statusPublished - Oct 11 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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