In Situ Construction of a High-Entropy Perovskite Based Tri-Phase Composite Electrode toward Efficient Reversible Solid Oxide Cells.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40855958.
- Also identified by DOI 10.1002/adma.202512257.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Reversible solid oxide cells (R-SOCs) are promising for energy applications but face limitations due to poor durability and slow oxygen-reduction/evolution reactions at air electrodes. Here, a high-entropy perovskite-based (HEP) tri-phase composite, (La<sub>0.2</sub>Sr<sub>0.2</sub>Pr<sub>0.2</sub>Ba<sub>0.2</sub>Ce<sub>0.2</sub>)<sub>x</sub>CoO<sub>3-δ</sub>, comprising an A-site deficient La<sub>0.2</sub>Sr<sub>0.2</sub>Pr<sub>0.2</sub>Ba<sub>0.2</sub>Ce<sub>0.2</sub>CoO<sub>3-δ</sub>, doped-CeO<sub>2</sub>, and Co<sub>3</sub>O<sub>4</sub> phases are presented. The HEP phase provides catalytic sites and robust frameworks, the doped-CeO<sub>2</sub> phase enhances oxygen-ion transport; and the Co<sub>3</sub>O<sub>4</sub> nanoparticles offer additional active sites. The optimized (La<sub>0.2</sub>Sr<sub>0.2</sub>Pr<sub>0.2</sub>Ba<sub>0.2</sub>Ce<sub>0.2</sub>)<sub>0.7</sub>CoO<sub>3-δ</sub> electrode exhibits promising electrochemical performance: a low area-specific resistance of 0.058 Ω cm<sup>2</sup> at 700 °C and enhance stability (a 2-fold improvement in ambient air, a 6-fold enhancement in moisture resistance, and a 3-fold increase in Cr tolerance compare to (La<sub>0.6</sub>Sr<sub>0.4</sub>)<sub>0.95</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-𝛿</sub>). When applied as an air electrode for R-SOCs, it delivers excellent performance at 800 °C: a peak power density of 1.68 W cm<sup>-2</sup> in fuel cell (FC); a current density of 1.5 A cm<sup>-2</sup> at 1.2 V in electrolysis cell (EC). Significantly, this work represents the first application of a high-entropy-oxide-based material as an air electrode in large-area R-SOCs (10×10 cm<sup>2</sup>). The assembled R-SOC achieves an output of 61 W in FC and 66 A at 1.18 V in EC at 800 °C, highlighting its potential for practical applications.