Tailoring electronic structure of perovskite cathode for proton-conducting solid oxide fuel cells with high performance

Xi Xu, Yangsen Xu, Jinming Ma, Yanru Yin, Marco Fronzi, Xianfen Wang, Lei Bi

研究成果: Article査読

22 被引用数 (Scopus)

抄録

Tailoring the electronic structure of the perovskite oxide could potentially allow dramatic improvements in the properties of cathode materials in proton-conducting solid oxide fuel cells (SOFCs). This has been demonstrated in the case of Mo-doped La0.5Sr0.5FeO3-δ, where the electronic structure of the La0.5Sr0.5FeO3-δ oxide has been changed with the Mo-doping, leading to a less strong metal-oxygen bond as well as a more active surface towards oxygen reduction. As a result, the more active oxygen atoms make the formation of oxygen vacancy and hydration that are critical for protonation more feasible. Furthermore, the electric field induced by Mo-doping provides an additional driving force for the movement of protons, accelerating the proton migrations in the oxide and thus improving the cathode performance. With the Mo-doped La0.5Sr0.5FeO3-δ as the cathode, a proton-conducting SOFC exhibits an impressive fuel cell output of 1174 mW cm−2 at 700 °C that surpasses most of the cells using similar types of cathodes. This study not only provides a proper cathode material without involving cobalt and barium elements but also gives an understanding of the design of the cathode by tailoring the electronic structures.

本文言語English
論文番号229486
ジャーナルJournal of Power Sources
489
DOI
出版ステータスPublished - 2021 3 31

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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