Chromium tolerance of high entropy BaO impregnated-(La0.2Pr0.2Sm0.2Gd0.2Nd0.2)Ba0.5Sr0.5Co1.5Fe0.5O5(LPSGNBSCF) cathodes for solid oxide fuel cell

The development of high-performance and chromium-tolerant stable hierarchical cathodes is crucial for practical applications of solid oxide fuel cells (SOFCs). This work presents a synergistic strategy to manufacture hierarchical cathodes, focusing on optimizing microstructural and electrochemical properties. By integrating advanced fabrication techniques, including nanostructuring and surface engineering, we achieved a significant enhancement in high entropy double perovskite cathode. The electrochemical activities and chromium tolerance of BaO impregnated on (La0.2Pr0.2Sm0.2Gd0.2Nd0.2)Ba0.5Sr0.5Co1.5Fe0.5O5 (LPSGNBSCF) high-entropy double perovskite cathodes in SOFCs were investigated in this study. Here, an optimum coated amount of BaO-LPSGNBSCF-0.15 mol/L electrode exhibited smaller electrode polarization resistance (R-p) of 0.22 Omega cm(2) than pure LPSGNBSCF electrode with R-p of 0.5 Omega cm(2) operating at 800 degrees C in the presence of Cr2O3 for 100 h. The synergistic catalyst coating of BaO-LPSGNBSCF-0.15 M could lead to less Cr deposition and SrCrO4 formation on LPSGNBSCF after exposure to Cr2O3. Moreover, the cell delivered the maximum power density of 985.9 mW/cm(2) at 800 degrees C, higher than 803.1 mW/cm(2) of bare LPSGNBSCF single cell and showed good stability with 100 h in short-term test. This work elucidated a rational design of efficient and durable high-entropy-based chromium tolerant cathode for SOFCs.