@article{Zhu2026, 
author = {Jiahui Zhu and Xiaofei Zhu and Yinlin Chang and Zetian Tao and Haocong Wang and Wenwen Zhang and Defeng Zhou and Jinghe Bai},
title = {Temperature-modulated high-entropy perovskite cathodes with superior electrocatalytic activity for reversible solid oxide cells},
year = {2026},
journal = {Journal of Advanced Ceramics},
keywords = {electrode, electrocatalytic activity, CO2 tolerance, solid oxide cell (SOC), high-entropy perovskite},
url = {https://www.sciopen.com/article/10.26599/JAC.2026.9221315},
doi = {10.26599/JAC.2026.9221315},
abstract = {Solid oxide cells (SOCs) hold great promise for clean energy conversion, yet conventional cathodes such as La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF) suffer from insufficient electrocatalytic activity and poor CO2 tolerance. This study designed a high-entropy perovskite, La0.2Sr0.2Pr0.2Nd0.2Ba0.2Co0.2Fe0.8O3–δ (HELSCF), via A-site high-entropy modification of LSCF. By regulating the synthesis temperature, two distinct crystal structures were achieved: an asymmetric tetragonal phase (HELSCF-Pbnm) with enhanced lattice distortion obtained at 1000 °C and a symmetric cubic phase (HELSCF-Pm3m) obtained at 1100 °C. Comprehensive characterizations confirmed that HELSCF-Pbnm exhibits superior properties, including a higher specific surface area, increased oxygen vacancy concentration, and optimized electronic structure. At 750 °C, the HELSCF-Pbnm-based symmetric cell delivers the lowest area-specific resistance of 0.040 Ω·cm2, along with excellent bifunctional activity toward both the oxygen reduction reaction and oxygen evolution reaction, as well as outstanding tolerance under CO2-containing atmospheres. When employed as the cathode in a single cell, it achieves a maximum power density of up to 1.38 W·cm−2, approximately 1.7 times that of LSCF. Furthermore, it demonstrates exceptional operational stability for over 260 h at 600 °C. Density functional theory calculations further reveal that the orthorhombic structure enhances O2 adsorption and d–p orbital hybridization, synergistically boosting catalytic performance. A temperature-modulated high-entropy strategy offers a facile and effective route for developing high-performance, CO2-tolerant cathodes for reversible SOCs.}
}