In Situ Construction of a High‐Entropy Perovskite Based Tri‐Phase Composite Electrode toward Efficient Reversible Solid Oxide Cells

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.

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Publication Details

Journal
Advanced Materials
Published
2025-08-26
DOI
https://doi.org/10.1002/adma.202512257
Citations
10
Primary Topic
Advancements in Solid Oxide Fuel Cells
Type
article
Field-Weighted Citation Impact
5.18
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article

In Situ Construction of a High‐Entropy Perovskite Based Tri‐Phase Composite Electrode toward Efficient Reversible Solid Oxide Cells

Yucun Zhou, Liangfei Xu, Yuechao Yao, Fuhuan Wang et al.
10 citations
Advanced Materials
Advancements in Solid Oxide Fuel Cells
5.18
article

In Situ Construction of a High‐Entropy Perovskite Based Tri‐Phase Composite Electrode toward Efficient Reversible Solid Oxide Cells

Yucun Zhou, Liangfei Xu, Yuechao Yao, Fuhuan Wang, Jianqiu Li, Jiangyuan Feng, Qiang Hu, Shaorong Wang, Pengfei Yan, Yan Li, Weifeng Zhang, Jun Zhang
article en
10 citations

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.

Advanced MaterialsVol. 37(45)
China University of Mining and Technology (CN), Lishui University (CN), Beijing University of Technology (CN), Zhejiang Energy Research Institute (CN), State Key Laboratory of Vehicle NVH and Safety Technology (CN), Beijing University of Chemical Technology (CN)
Openalex Percentile: Top 4%
Advancements in Solid Oxide Fuel Cells
5.18
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