Akademik Veri Yönetim Sistemi
Journal of Solid State Chemistry, cilt.362, 2026 (SCI-Expanded, Scopus)
This work focuses on the development and systematic investigation of Gd, Dy codoped CeO2 (Ce0.90Gd0.05Dy0.05O2−δ)- (CGD) based heterostructured composite electrolytes with SrTiO3 (STO) (70:30, 60:40, 50:50, 40:60) for intermediate-temperature solid oxide fuel cells (IT-SOFCs). For this purpose, CGD was first synthesized using the glycine-assisted combustion method, followed by the preparation of STO-based heterostructured composites through a conventional solid-state mixing route. Structural and phase analyses confirmed the coexistence of fluorite-type CeO2 and cubic perovskite STO without secondary phases. Raman and Rietveld analyses indicated increased oxygen vacancy formation and lattice distortion due to Gd, Dy codoping and STO addition. SEM and EDX analyses demonstrated homogeneous morphology and elemental distribution, while sintered pellets showed dense and crack-free microstructures. Optical band gap measurements revealed a widening trend with increasing STO content. Electrochemical impedance spectroscopy (EIS) results revealed that the incorporation of STO significantly affects the transport properties. Arrhenius analyses demonstrated that the activation energy and conduction mechanism vary depending on the composition ratio, indicating that both ionic and electronic conduction contribute to the system. These findings show that heterointerface engineering plays a critical role in controlling charge carrier transport.