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Multi-heterojunction engineering of simple oxide electrolyte for highperformance low-temperature solid oxide fuel cells
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DOI：10.26599/NR.2026.94908331.png)
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Abstract
En 中文
Achieving high performance in solid oxide fuel cells (SOFCs) under low-temperature operation remains hindered by the lack of efficient electrolytes that can simultaneously ensure fast ion transport and negligible electron leakage. Here, we introduce a ternary multiheterojunction composite electrolyte based on p-type NiO, n-type Li0.25Sn0.75O2-delta (LS), and Sm0.2Ce0.8O2-delta (SDC) to testify its high-performance capability in low-temperature SOFCs. The unique configuration integrates two p-n and one n-n junctions, which can promote the oxygen ion transport while eliminating electronic short-circuiting. The optimized NLS-SDC 6:4 heterostructure (in mass ratio, and NLS stands for the NiO-LS composite precusor prepared in molar ratio of 8:9) achieves a record of an ionic conductivity around 0.348 S & centerdot;cm-1 and a peak power density (PPD) of 916 mW & centerdot;cm-2 at 550 degrees C,and a long-term stability of over 280 h operation at 150 mA & centerdot;cm-2. Multi-scale characterizations coupled with the density functional theory analyses confirm that the interfacial band alignment and oxygen vacancy enrichment synergistically drive the exceptional ion transport properties. This study highlights multi-heterojunction engineering of simple oxides as a versatile and scalable strategy for next-generation SOFC electrolytes, with broad implications for solid oxide electrolysis, solar energy conversion, and selective ion-conducting membranes.
Keywords:
low-temperature ceramic fuel cells
simple oxides
multi-heterojunction composite electrolyte
long-term stability
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