Perovskite Al-SrTiO3 semiconductor electrolyte with superionic conduction in ceramic fuel cells

M. A.K.Yousaf Shah, Yuzheng Lu*, Naveed Mushtaq, Muhammad Yousaf, Sajid Rauf, Muhammad Imran Asghar, Peter D. Lund, Bin Zhu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)
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Perovskite oxide doping may modulate the energy bandgap strongly affecting the oxygen reduction activity and electrical properties with high promise for use as a low-temperature solid oxide fuel cell (LT-SOFC) electrolyte. Here, we show that a small amount of Al-doping into SrTiO3−δ may tune the energy band structure of SrTiO3−δ, triggering the electrochemical mechanism and fuel cell performance. The synthesized SrTiO3−δ and Al-SrTiO3−δ electrolytes are sandwiched between two symmetrical electrodes (Ni foam pasted NCAL). Ni-NCAL/SrTiO3−δ/NCAL-Ni and Ni-NCAL/Al-SrTiO3−δ/NCAL-Ni structures delivered a maximum power density of 0.52 W and 0.692 W and high ionic conductivity of 0.11 S cm−1 and 0.153 S cm−1, respectively, under H2/Air atmosphere at low operational temperature of 520 °C. Highways of ion transport along the surface and grain boundary (interface) are identified as the main reason for good oxygen ion conduction. X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), UV visible (UV), and X-ray photoelectron spectroscopy (XPS) were performed to investigate the structural, electrochemical, morphological, surface and interfacial properties of Al-SrTiO3−δ. The obtained results suggest that a certain amount of Al (20%) doping into SrTiO3 (SrTi0.8Al0.2O3−δ) improves the fuel cell performance and is a promising electrolyte candidate for LT-SOFC.

Original languageEnglish
Pages (from-to)3794-3805
JournalSustainable Energy and Fuels
Issue number16
Early online date2022
Publication statusPublished - 11 Aug 2022
MoE publication typeA1 Journal article-refereed


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