Ni-Fe　Layered　double　hydroxides　(NiFe　LDHs)　are　a　promising　electrocatalyst　for　oxygen　evolution　reaction　(OER)　under　alkaline　environments.　However,　the　bulk　NiFe　LDHs　with　less　exposed　active　sites　limit　the　improvement　of　the　electrocatalytic　activity.　Herein,　an　oxygen　vacancy　(Ovac)　-enriched　surface　for　NiFe　LDHs　on　nickel　foam　(Ce　asst-NiFe　LDHs/NF)　was　obtained　by　cerium　(III)　ion　as　an　assistant　reagent　via　a　hydrothermal　approach.　Note　that　Ce3+　ions　were　verified　without　residue　at　the　as-resulted　Ce　asst-NiFe　LDHs/NF　after　the　sediment　centrifuging.　Ce3+　was　here　readily　adsorbed　on　the　surface　of　NiFe　LDHs　during　the　synthetic　process,　reducing　their　thickness　(~6　nm).　In　addition,　Ce3+　with　a　lower　electronegativity　competes　with　Ni2+　and　Fe3+,　inducing　increase　for　Ovac　near　metal　active　sites　on　the　surface　of　NiFe　LDHs.　The　Ce　asst-NiFe　LDHs/NF　electrocatalyst　with　enriched　Ovac　has　exhibited　extremely　electrocatalytic　activity　for　OER　at　the　low　potential　with　only　246　mV　to　achieve　200　mA　cm-2　in　1　M　KOH.　The　favorable　stability　of　18　h　at　the　current　density　of　50　mA　cm-2　increases　with　only　~0.2%　potential.　Our　research　paves　the　way　to　designing　highly　active　surface　of　NiFe　LDHs　OER　catalysts.　©　2021　Elsevier　B.V.