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

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number229486
JournalJournal of Power Sources
Volume489
DOIs
Publication statusPublished - 2021 Mar 31

Keywords

  • BaCeO-BaZrO
  • Cathode
  • Proton conductor
  • Solid oxide fuel cell
  • Theoretical calculations

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Tailoring electronic structure of perovskite cathode for proton-conducting solid oxide fuel cells with high performance'. Together they form a unique fingerprint.

Cite this