Synthesis and Catalytic Performance of High-Entropy Rare-Earth Perovskite Nanofibers: (Y_0.2La_0.2Nd_0.2Gd_0.2Sm_0.2)CoO₃...

This study investigated the catalytic properties of low-temperature oxidation of carbon monoxide, focusing on (Y_0.2La_0.2Nd_0.2Gd_0.2Sm_0.2)CoO₃ synthesized via a glycothermal method using 1,4-butanediol and diethylene glycol at 250 °C. This synthesis route bypasses the energy-intensive sintering process at 1200 °C while maintaining a high-entropy single-phase structure. The synthesized material was characterized structurally and chemically by X-ray diffraction and SEM/EDX analyses. The material was shown to form nanofibers of (Y_0.2La_0.2Nd_0.2Gd_0.2Sm_0.2)CoO₃, thereby increasing the active surface area for catalytic reactions, and crystallize in the model Pbnm space group of distorted perovskite cell. Using a custom setup to investigate catalytic properties of (Y_0.2La_0.2Nd_0.2Gd_0.2Sm_0.2)CoO₃, the CO oxidation behavior of those high-entropy perovskite oxide was investigated, showing an overall conversion of 78% at 50 °C and 97% at 100 °C. These findings highlight the effective catalytic activity of nanofibers of (Y_0.2La_0.2Nd_0.2Gd_0.2Sm_0.2)CoO₃ under mild conditions and their versatility in various catalytic processes of robust CO neutralization. The incorporation of rare-earth elements into a high-entropy structure could impart unique catalytic properties, promoting a synergistic effect that enhances performance.