CeO₂@La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ电解质的制备及半导体离子燃料电池性能研究

Developing electrolytes with high ionic conductivity is crucial to improve the electrochemical performance of semiconductor ion fuel cells (SIFC) at medium and low temperatures. In this study, a solvothermal method was employed to synthesize a core-shell structured CeO₂@La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (CeO₂@LSCF) composite electrolyte material. The phase information, microstructure, and valence state evolution of the material were analyzed. Moreover, its electrochemical performance and fuel cell properties were systematically investigated when used as an electrolyte in SIFCs. The charge transfer mechanism and the role of the built-in electric field at the core-shell heterojunction interface were also examined. The experimental results demonstrated that at 550℃, the CeO₂@LSCF electrolyte exhibited a maximum power density of 942.2 mW·cm^-2 at an open circuit voltage of 1.08 V. As a mixed ion and electron conductor in SIFC electrolyte materials, the core-shell structured CeO₂@LSCF holds great potential for future applications.