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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Kočí, Jan | Prague |
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Azam, Siraj |
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Blanpain, Bart |
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Ali, M. A. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Akbar, Nabeela
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article
Semiconductor Heterostructure (SFT-SnO2) Electrolyte with Enhanced Ionic Conduction for Ceramic Fuel Cells
Abstract
<p>Electronic conduction inhibition, heterostructure construction, constituting built-in electric field (BIEF), and the generation of an energetically more active region in the lattice and at the interface are ways to increase the ionic conductivity (σ<sub>i</sub>) of electrolyte materials for ceramic fuel cells (CFCs). The conduction of ions and stoppage of e<sup>-</sup> conductivity are of utmost importance in semiconductor-based electrolytes. Type-II heterojunction can be synthesized to improve fuel cell performance by increasing ionic conductivity. SFT (SrFe<sub>0.3</sub>Ti<sub>0.7</sub>O<sub>3</sub>)-SnO<sub>2</sub> p-n heterojunction was produced by combining p-type SFT and n-type SnO<sub>2</sub> semiconductors. The resulting SFT-SnO<sub>2</sub> heterostructure unveiled a high ionic conductivity of 0.18 S/cm and an open-circuit voltage (OCV) of 1.04 V, contributing to a remarkable power output of 805 mW/cm<sup>2</sup> at a low operating temperature of 520 °C. High ionic conductivity and efficient fuel cell performance are attributed to a synergistic interaction between the SFT/SnO<sub>2</sub> heterojunction and BIEF. Heterojunction production between SFT and SnO<sub>2</sub> was confirmed by numerous characterization techniques (X-ray diffractometer (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), UV-visible, ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS)). The SFT/SnO<sub>2</sub> junction valence band deviation and energy band structure were also validated. Our research shows that the constructed heterostructure SFT-SnO<sub>2</sub> is an effective and efficient electrolyte material for future fuel cell technology.</p>