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Rare earth-incorporated cerium dioxide based composite electrolyte with heterostructure for semiconductor ionic fuel cells
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DOI：10.1016/j.jre.2026.07.011.png)
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Abstract
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Semiconductor ionic fuel cells (SIFCs), which utilize composite electrolytes composed of semiconductor materials and ionic conductors, have attracted considerable research attention in recent years. In this study, PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) was composited with the traditional ionic conductor Ce0.8Sm0.2O1.9 (SDC) to produce a PBSCF-SDC heterostructured composite electrolyte, which has triple-conduction (H+/O2–/e–). High-resolution transmission electron microscopy (HR-TEM) confirms the establishment of a continuous heterogeneous interface within the composite. The examination of the energy band structure confirms its ability for charge separation and the impetus for ion transport. The heterojunction forms between the two materials and the Schottky junction at the electrode/semiconductor interface effectively suppresses short-circuiting, resulting in a high open-circuit voltage (OCV) and significantly improves the cell’s performance. Cells employing the composite electrolyte achieve an OCV exceeding 1.0 V and a maximum power density (MPD) ranging from 394.42 to 728.67 mW/cm2 at 550 °C, which is higher than that of the cells based on pure SDC electrolyte. Electrochemical performance testing indicates a record cell performance of 728.67 mW/cm2 and an ionic conductivity of 0.102 S/cm at 550 °C can be obtained in the single cell based on the 2PBSCF-8SDC composite electrolyte. This composite strategy provides new insights for selecting electrolytes in semiconductor ionic fuel cells.
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