Electrochemical Properties of a Dual-Ion Semiconductor-Ionic Co_0.2Zn_0.8O-Sm_0.20Ce_0.80O_2−δ Composite for a High-Performance Low-Temperature Solid Oxide Fuel Cell

Semiconductor heterostructures offer a high ionic conduction path enhanced by built-in electric field at the interface, which helps to avoid electronic conduction in low-temperature solid oxide fuel cells (LT-SOFCs). In this study, we synthesized a semiconductor heterostructure based on Co-doped ZnO and Sm0.2Ce0.8O2–δ (SDC) for LT-SOFC application. First, we optimized the composition of the Co-doped ZnO by varying the doping concentration. The...