Mo-doped　La2Ce2CO7　with　varied　concentrations　are　prepared　by　the　traditional　citrate-nitrate　combustion　method.　The　effects　of　the　phase　structure　of　Mo-doped　La2Ce2O7　are　investigated　by　X-ray　diffraction,　scanning　electron　microscopy,　Raman　spectroscopy,　X-ray　photoelectron　spectroscopy　and　conductivity　measurements.　X-ray　diffraction　patterns　reveal　that　all　La2-xMoxCe2O7+delta　samples　have　a　cubic　structure.　Neverly,　hole　can　be　found　on　the　surface　of　the　samples　from　scanning　electron　microscopy.　Raman　spectra　show　that　the　different　vibrating　structures　of　pellets　can　be　changed　by　introducing　Mo　into　La2Ce2O7.　Detailed　X-ray　photoelectron　spectroscopy　studies　on　the　oxidation　states　of　La2Ce2O7　and　La1.85Mo0.15Ce2O7+delta　indicate　ratios　of　O-c　to　O-T　(O-T　=　O-c　+　O-L)　are　between　32.21%　and　46.24%.　The　conduction　behaviour　of　Mo　doped　La2Ce2O7　electrolyte　is　seriously　researched　under　air　and　5%H-2-95%Ar　conditions　at　350-700　degrees　C,and　the　highest　conductivity　of　7.36　X　10(-3)　and　1.65　X　10(-2)　Scm(-1),　respectively,　are　obtained　with　La1.85Mo0.15Ce2O7+delta　pellets　at　700　degrees　C.　The　highest　power　density　of　single　cells　with　the　La1.85Mo0.15Ce2O7+delta　electrolyte　is　approximately　0.643　Wcm(-2)　at　700　degrees　C,　suggesting　that　Mo-doped　La2Ce2O7　can　be　used　to　substantially　improve　the　electrochemical　performance　of　low-temperature　solid　oxide　fuel　cells.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.