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Perovskite Al-SrTiO3 semiconductor electrolyte with superionic conduction in ceramic fuel cells
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Sustainable Energy and Fuels, Volume 6, issue 16, pp. 3794-3805
Abstract
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.
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Funding Information: This work was supported by Southeast University (SEU) PROJET # 3203002003A1 and the National Natural Science Foundation of China (NSFC) under grants # 51772080 and 11604088. Jiangsu Provincial Innovation and Entrepreneurship Talent Program Project No. JSSCRC2021491. Industry-University-Research Cooperation Project of Jiangsu Province in China, Grant No. BY2021057. Dr Asghar thanks the Hubei Talent 100 Program and the Academy of Finland (Grant No. 13329016, 13322738) for their financial support. Publisher Copyright: © 2022 The Royal Society of Chemistry
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Shah, M A K Y, Lu, Y, Mushtaq, N, Yousaf, M, Rauf, S, Asghar, M I, Lund, P D & Zhu, B 2022, 'Perovskite Al-SrTiO 3 semiconductor electrolyte with superionic conduction in ceramic fuel cells', Sustainable Energy and Fuels, vol. 6, no. 16, pp. 3794-3805. https://doi.org/10.1039/d2se00643j