A joint research team from Southeast University and Shenzhen University has developed a novel function of semiconductor-ionic conductor (SIC) using a Cu-Sm co-doping ceria (SCDC) to enhance ionic and electronic conductivity simultaneously, achieving superionic transport property and excellent fuel cell performance. The study challenges the limitations in ionic conductivity by co-doping ceria with Samarium and Copper, reaching an exceptional ionic conductivity of 0.16 S/cm at 520°C. The synergy between Sm3+ and Cu2+ drives electron-ion coupling, optimizing charge transfer and enhancing conduction efficiency. Structural refinement in the co-doped electrolyte leads to a denser grain network, improving ion mobility and long-term durability. This advancement in electrolyte materials for low-temperature solid oxide fuel cells paves the way for high-efficiency, commercially competitive ceramic fuel cells. The research, recently published in Materials Futures, provides valuable insight into charge modulation and defect interactions, enhancing energy efficiency in electrochemical device design and manufacturing.