High electrochemical activity of Bi2O3-based composite SOFC cathodes

Woo Chul Jung, Yun Jie Chang, Kuan Zong Fung, Sossina Haile*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Due to high ionic conductivity and favorable oxygen electrocatalysis, doped Bi2O3 systems are promising candidates as solid oxide fuel cell cathode materials. Recently, several researchers reported reasonably low cathode polarization resistance by adding electronically conducting materials such as (La,Sr)MnO3 (LSM) or Ag to doped Bi2O3 compositions. Despite extensive research efforts toward maximizing cathode performance, however, the inherent catalytic activity and electrochemical reaction pathways of these promising materials remain largely unknown. Here, we prepare a symmetrical structure with identically sized Y0.5Bi1.5O3/ LSM composite electrodes on both sides of a YSZ electrolyte substrate. AC impedance spectroscopy (ACIS) measurements of electrochemical cells with varied cathode compositions reveal the important role of bismuth oxide phase for oxygen electrocatalysis. These observations aid in directing future research into the reaction pathways and the site-specific electrocatalytic activity as well as giving improved guidance for optimizing SOFC cathode structures with doped Bi2O3 compositions.

Original languageEnglish (US)
Pages (from-to)278-282
Number of pages5
JournalJournal of the Korean Ceramic Society
Volume51
Issue number4
DOIs
StatePublished - Jul 31 2014

Keywords

  • Composite cathode
  • Doped BiO
  • Impedance spectroscopy
  • Oxygen reduction reaction

ASJC Scopus subject areas

  • Ceramics and Composites

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