The　protonic　material　La2Ce2O7　exhibits　good　tolerance　to　H2O　and　CO2　compared　to　BaCeO3-based　materials　and　has　become　increasingly　popular　for　operation　at　low-to-intermediate　temperatures　in　protonic　ceramic　fuel　cells.　In　this　work,　doping　La2Ce2O7　with　Na　in　a　series　with　varying　compositions　is　studied.　All　of　the　precursors　are　prepared　by　a　common　citrate-nitrate　combustion　method.　X-ray　diffraction　images　reveal　that　all　of　the　La2-xNaxCe2O7.delta　samples　have　a　cubic　structure.　The　La2-xNaxCe2O7.delta　pellets　are　characterized　by　scanning　electron　microscopy　and　are　observed　to　be　dense　without　holes.　The　effects　of　Na-doping　on　the　La2Ce2O7　electrical　conductivity　are　carefully　investigated　in　air　at　350-800　degrees　C　and　5%H-2-95%　Ar　environments　at　350-700　degrees　C.　It　is　found　that　different　levels　of　Na　doping　in　La2Ce2O7　are　conducive　to　improving　the　electrical　conductivity　and　sinterability.　Among　the　pellets,　La1.85Na0.15Ce2O7.delta　exhibited　the　highest　electrical　conductivity　in　air　and　55/a　H-2-95%　Ar　atmospheres.　Anode-supported　half　cells　with　La1.85Na0.15Ce2O7.delta　electrolyte　are　also　fabricated　via　a　dry-pressing　process,　and　the　corresponding　single　cell　exhibited　a　desirable　power　performance　of　501　mW　cm(-2)　at　700　degrees　C.　The　results　demonstrate　that　La1.85Na0.15Ce2O7.delta　is　a　promising　proton　electrolyte　with　high　conductivity　and　sufficient　sinterability　for　use　in　protonic　ceramic　fuel　cells　operating　at　reduced　temperatures.