High-entropy cobalt-free perovskite as a high-performing nanofiber cathode for solid oxide fuel cells

Abstract

In this study, a novel A-site high entropy perovskite oxide La_1/6Pr_1/6Nd_1/6Ba_1/6Sr_1/6Ca_1/6FeO_3−δ (LPNBSCF) is prepared by the electrospinning method and used as a cobalt-free cathode for solid oxide fuel cells (SOFCs) at intermediate temperatures. The LPNBSCF nanofiber cathode exhibits a pure phase perovskite structure and a strong chemical compatibility with the electrolyte (Sm_0.2Ce_0.8O_1.95). The anode-supported single cell with the LPNBSCF nanofiber cathode shows a remarkable peak power density (PPD) of 1.439 W cm⁻² at 750 °C, surpassing that of the cell with a La_0.6Sr_0.4FeO_3−δ (LSF) nanofiber cathode (0.836 W cm⁻²). These findings suggest the significant potential application of the LPNBSCF nanofiber cathode in SOFCs.