Solid Oxide Electrochemical Cells In article number 2207725, Kang Taek Lee, Ha-Ni Im, and Hyeongmin Yu, report the fabrication of a highly conductive, ultra-thin (250 nm), defect-free Sm0.075Nd0.075Ce0.85O2−δ (SNDC) interlayer via readily processable gelatin-assisted deposition. The solid oxide electrochemical cells (SOCs) with this SNDC exhibited exceptionally high performances both in fuel ce...