Developing CeO2-CoAl2O4 Semiconductor Ionic Based Heterostructure Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells (SOFCs)

Semiconductor ionic electrolytes, especially heterostructure composites, have a significant role in enhancing oxide ion conductivity and peak power density (PPD) because of their interfacial contact. In this work, the fluorite structure CeO2 spinel-based CoAl2O4 samples, as composite electrolyte, are successfully fabricated. The p-type n-type (CeO2-CoAl2O4) used an electrolyte exhibits cell performance 840 mW/cm2 under fuel H2/air conditions at 550 °C, which is quite higher than pure devices. Scanning electron microscopy (SEM) high-resolution transmission (HR-TEM) verified formation including morphological analysis prepared composite. heterostructure-based CeO2-CoAl2O4 achieved 0.13 S/cm °C temperature, means that constructed device works by suppressing electronic conductivity. Meanwhile, obtained results demonstrate semiconductor effect adjusting appropriate composition to build (CeO2) (CoAl2O4) components built-in electric field. So, work can be effective for energy conversion storage