Developing　bifunctional　electrocatalysts　with　improved　efficiency　and　stability　in　overall　water　splitting　is　of　extreme　importance　for　renewable　energy　utilization.　In　this　work,　an　in　situ　N　doping　strategy　was　demonstrate　to　boost　the　efficiency　and　stability　of　nickel　molybdenum　sulfide　both　in　electrocatalytic　hydrogen　evolution　reaction　and　oxygen　evolution　reaction.　Experimental　and　theoretical　results　indicate　that　such　modification　offers　enriched　active　sites　for　electrochemical　reaction,　and　further　increases　the　kinetic　driven　force　of　water　electrolysis.　As　a　result,　the　N　-NiMoS　electrode　exhibits　a　remarkably　improved　performance　with　rather　low　potential　of　1.54　V　to　offer　a　current　density　of　10　mA　cm　-2　for　overall　water　splitting,　which　is　130　mV　decrease　than　that　of　pristine　one.　In　addition,　impressive　electrochemical　stability　also　reveals　a　76.6%　preservation　of　initial　current　density　after　100　h　test,　which　is　superior　than　that　of　pristine　one　after　25　h　test.　Therefore,　the　potential　to　enhance　the　performance　of　electrocatalysts　by　as-proposed　route　promises　a　valuable　way　to　develop　efficient　catalysts　with　enhanced　property　for　electrochemical　applications.　(c)　2022　Published　by　Elsevier　Ltd　on　behalf　of　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.