Electrochemical performance and stability of SrTi0.3Fe0.6Co0.1O3-Δ infiltrated La0.8Sr0.2MnO3[sbnd]Zr0.92Y0.16O2-Δ oxygen electrodes for intermediate-temperature solid oxide electrochemical cells

Shan Lin Zhang, Hongqian Wang, Matthew Y. Lu, Cheng Xin Li, Chang Jiu Li, Scott A. Barnett*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The La0.8Sr0.2MnO3[sbnd]Zr0.92Y0.16O2-δ (LSM-YSZ) composite is the most widely used oxygen electrode for solid oxide electrochemical cells (SOCs). However, operating temperatures >700 °C are required for good performance since oxygen reactions are limitied to three-phase boundaries (TPBs) because of poor ionic conductivity of LSM. Furthermore, LSM-YSZ electrodes typically delaminate during electrolysis operation leading to cell degradation. One strategy to improve SOCs with LSM-YSZ electrodes is to infiltrate a mixed ionically and electronically conducting (MIEC) material that promotes oxygen exchange. However, infiltrated materials have a nano-scale structure that may not be stable under SOC operating temperatures. Here, we report results on the infiltration of SrTi0.3Fe0.6Co0.1O3-δ (STFC), a recently reported high performance MIEC, into LSM-YSZ to improve its electrochemical performance and stability at intermediate temperatures. The infiltrated STFC enhances LSM-YSZ and cell performance, typically yielding a decrease in electrode polarization resistance by a factor >3 times, resulting in an increase in fuel cell maximum power density and electrolysis current density (at 1.3 V) by a factor > 2 times. Perhaps more significantly, the infiltrated electrodes show good performance stability, with suppression of electrode delamination during electrolysis and no evidence of coarsening or segregation induced degradation.

Original languageEnglish (US)
Pages (from-to)233-241
Number of pages9
JournalJournal of Power Sources
Volume426
DOIs
StatePublished - Jun 30 2019

Keywords

  • Electrochemical performance
  • Infiltration
  • Oxygen electrode
  • Solid oxide electrochemical cells
  • Stability

ASJC Scopus subject areas

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

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