Pt decorated (CoMnFeCrNi)3O4 high-entropy oxide for low-temperature combustion of C3H8

High-entropy oxides (HEOs) have attracted significant attention as catalyst materials due to their unique high- entropy effect. However, their catalytic performance is often limited by a low specific surface area, a result of high-temperature synthesis. In this study, we prepared (CoMnFeCrNi)3O4 catalysts with high surface areas using the solution combustion synthesis method. Subsequently, Pt/(CoMnFeCrNi)3O4 composite catalysts for C3H8 combustion were synthesized through atomic layer deposition. Comprehensive characterizations confirmed the single spinel structure of the HEOs and the high dispersion of the loaded Pt nanoparticles. Notably, the best- performing Pt/(CoMnFeCrNi)3O4 composite catalyst exhibited remarkable C3H8 combustion activity, achieving 90% conversion of C3H8 at 302 degrees C, while maintaining good stability and water resistance. This performance enhancement is attributed to the activation of oxygen species at the Pt-HEO interface, which facilitates the decomposition of formate species during C3H8 combustion.