Abstract Scope |
Perovskites have been the predominant materials for solid oxide fuel cells (SOFCs)cathodes. In this study, a wide range of equimolar A (La, Sr, Ba, Pr, Gd, Y, Sm, Nd) and/or B (Cr, Mn, Fe, Co, Ni) site elements have been screened in the ABO3 formula to synthesize perovskite-structured high-entropy oxides for the application as SOFCs cathode. XRD, TEM, XPS, and ICP-MS have been applied to investigate the phase structure and chemical composition of samples prepared by different routes. 6 out of 13 formulas are formed with high-entropy perovskite structure. The electrochemical evaluation shows that some of these specimens display improved performance, stability and/or tolerance toward CO2 under typical SOFCs operation conditions when compared to the benchmark LSCF cathode. These findings suggest a great promise to use high entropy perovskites to tackle the stability and performance issues of current cathode candidates, and encourage further refinement on the current equimolar composition design. |