Semiconductor Fe-doped SrTiO3-δ perovskite electrolyte for low-temperature solid oxide fuel cell (LT-SOFC) operating below 520 °C

M. A.K.Yousaf Shah, Sajid Rauf, Naveed Mushtaq, Zuhra Tayyab, Nasir Ali, Muhammad Yousaf, Yueming Xing, Muhammad Akbar, Peter D. Lund, Chang Ping Yang, Bin Zhu*, Muhammad Imran Asghar

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

High-temperature operation of solid oxide fuel cells causes several degradation and material issues. Lowering the operating temperature results in reduced fuel cell performance primarily due to the limited ionic conductivity of the electrolyte. Here we introduce the Fe-doped SrTiO3-δ (SFT) pure perovskite material as an electrolyte, which shows good ionic conduction even at lower temperatures, but has low electronic conduction avoiding short-circuiting. Fuel cell fabricated using this electrolyte exhibits a maximum power density of 540 mW/cm2 at 520 °C with Ni-NCAL electrodes. It was found that the Fe-doping into the SrTiO3-δ facilitates the creation of oxygen vacancies enhancing ionic conductivity and transport of oxygen ions. Such high performance can be attributed to band-bending at the interface of electrolyte/electrode, which suppresses electron flow, but enhances ionic flow.

Original languageEnglish
Pages (from-to)14470-14479
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number28
Early online date1 Jan 2020
DOIs
Publication statusPublished - 21 May 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Band alignment
  • Impressive fuel cell performance & high ionic conduction
  • Low-temperature solid oxide fuel cell (LT-SOFC)
  • Semiconductor electrolyte SFT

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