Heteroatom　doping,　especially　with　elements　of　lower　electronegativity　and　smaller　atomic　radius,　can　effectively　modulate　the　electronic　structure　and　surface　properties　of　electron　materials,　facilitating　the　electrochemical　performance　of　supercapacitors.　Herein,　we　have　designed　boron-doped　NiCoP　nanoarrays　grown　on　carbon　cloth　(B-NCP-CC)　for　supercapacitor　cathode　materials　using　a　simple　process　method　combining　hydrothermal,　calcined　phosphating　and　boronation　processes.　The　introduction　of　boron,　with　lower　electronegativity　(2.04)　and　smaller　atomic　radius　(0.85　&　Aring;)　than　phosphorus　(2.19　and　1.00　&　Aring;),　induces　electron　redistribution　and　shortens　the　Ni/Co-B　bonds,　enhancing　their　redox　activity　and　charge　transfer　kinetics.　The　boron　doping　greatly　enables　the　B-NiCoP-CC-18　(NiCoP-CC　borated　for　18　h)　cathode　material　to　provide　a　high　capacity　of　801　C　g(-1).　The　assembled　B-NiCoP-CC-18||AC　hybrid　supercapacitor　achieves　a　high　energy　density　of　73.22　W　h　kg(-1)　at　a　power　density　of　963.8　W　kg(-1)　and　retains　90%　capacity　after　5000　cycles,　significantly　improving　the　stability　of　nickel-based　materials.　Besides,　density　functional　theory　(DFT)　calculations　further　elucidate　that　the　introduction　of　boron　increases　the　d-band　centers　of　Ni　and　Co　in　NiCoP,　promoting　the　conductivity　and　enhancing　the　electrochemical　properties.