A Highly Efficient and Robust Bifunctional Perovskite-Type Air Electrode with Triple-Conducting Behavior for Low-Temperature Solid Oxide Fuel Cells

Zilin Ma, Qirui Ye, Bingkai Zhang, Wenying Yang, Feifei Dong, Meng Ni, Zhan Lin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Cobalt-rich materials have generally been recognized as the prevailing candidates of cathodes for low-temperature solid oxide fuel cells (LT-SOFCs, 400–600 °C). Regrettably, their instability and high cost are the major concerns for future commercialization. In response to these drawbacks, here, an A-site-deficient low-cobalt-containing perovskite-type oxide, Ba0.95Fe0.7Co0.2Sc0.1O3-δ (BFCS0.95), as an efficient bifunctional electrode with triple-conducting (H+|O2−|e) nature for oxygen-ion conducting SOFCs (O-SOFCs) and proton conducting SOFCs (H-SOFCs) is proposed. BFCS0.95 electrode exhibits impressive versatility in catalyzing oxygen reduction reaction, i.e., ultralow area-specific resistances (0.072 Ω cm2 for O-SOFCs and 0.4 Ω cm2 for H-SOFCs at 550 °C, respectively), extraordinarily high power outputs (1092 mW cm−2 for O-SOFCs and 419 mW cm−2 for H-SOFCs at 550 °C, respectively), excellent long-term durability (>100 h for O-SOFCs and H-SOFCs at 600 °C), remarkable reversibility between pure air and CO2-containing air, and superior resistance against temperature fluctuations. The combined experimental and computational studies elucidate the roles of A-site deficient state and triple-conducting behavior, both of which are essential to overall electrochemical performance. Low-cobalt-containing feature also makes BFCS0.95 cathode economically competitive among all cobalt-containing analogues. Overall, the finding paves a highly efficient route to develop bifunctional electrodes for LT-SOFCs toward a sustainable energy future.

Original languageEnglish
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - Sep 2022

Keywords

  • bifunctional cathodes
  • oxygen reduction reaction
  • perovskites
  • solid oxide fuel cells
  • triple-conductors

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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