The　different　compositions　of　La3+　and　In3+　co-doped　ceria　have　been　prepared　by　a　citric　acid-nitrate　sol-gel　method.　All　the　compositions　with　general　formula　Ce0.85La0.15-xInxO1.925(CLI)　have　the　same　concentration　of　total　oxygen　vacancies.　The　results　of　the　lattice　parameter　calculated　by　the　hard　sphere　model　are　consistent　with　those　of　experimental　data.　All　the　samples　sintered　at　1350 °C　have　the　relative　density　more　than　96%.　The　relative　density　and　grain　size　of　all　the　sintered　pellets　increase　with　increasing　In3+　concentration.　Electrochemical　analysis　indicates　that　grain　conductivity　of　Ce0.85La0.15-xInxO1.925　(x　=　0.01~0.03)　is　pretty　much　the　same　with　increasing　content　of　In,　while　the　grain　boundary　conductivity　decreases　with　increasing　content　of　In.　Moreover,　La3+　and　In3+　co-doped　exhibits　higher　ionic　conductivity　and　lower　activation　energy　as　compared　with　La　singly　doped　ceria.　The　maximum　power　density　of　based　on　the　CLI1　cells　co-fired　at　1350 °C　can　reach　635 mW cm−2　at　700 °C.　©　2018,　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.