Phosphates　are　a　kind　of　promising　electrode　materials　because　they　can　provide　numerous　cavities　and　several　reaction　sites　to　be　favored　for　storing　anions　and　cations.　However,　the　widespread　application　of　phosphates　are　limited　by　their　intrinsically　low　electronic　conductivity.　RuO2/hydrated　RuO2　exhibits　high　conductivity　and　excellent　electrochemical　properties.　Reducing　its　dosage　and　increasing　its　specific　surface　area　are　the　research　concerns.　Combining　less　RuO2　to　Nickel　phosphate　(NiP)　is　expected　to　improve　the　electrochemical　performance.　RuO2-modified　NiP　(NiP-RuO2)　electrode　material　is　synthesized　by　a　one-step　hydrothermal　reaction　and　its　structural　morphology　and　capacitive　properties　are　investigated.　The　results　indicate　that　NiP-RuO2　electrode　consists　of　hydrated　RuO2　and　Ni11(HPO3)8(OH)6,　and　exhibits　excellent　battery-type　electrochemical　supercapacitor　performance　with　a　specific　capacity　of　878.06　C/g　at　1　A/g.　According　to　density　functional　theory　(DFT)　analysis,　Ru-doped　Ni11(HPO3)8(OH)6　has　a　narrower　forbidden　band　width　and　higher　conductivity　than　Ni11(HPO3)8(OH)6.　Furthermore,　the　asymmetric　supercapacitor　(ASC)　assembled　by　NiP-RuO2/NF　and　activated　carbon　(AC)　electrode　achieves　a　high　energy　density　(43.58　Wh/kg)　at　a　power　density　of　923.47　W/kg.　When　two　ASC　devices　are　connected　in　series,　ten　light-emitting　diodes　(LEDs)　can　be　illuminated　for　ten　minutes.　©　2024　Elsevier　Ltd