The　development　of　bifunctional　electrochemically　-active　materials　for　both　hydrogen　evolution　reaction　(HER)　and　supercapacitors　enables　the　possibility　to　integrate　energy　storage　and　production　into　one　single　system.　Here,　we　report　a　novel　bifunctional　mesoporous　Ni2P　nanobelt-like　architecture　prepared　via　the　hydrothermal　synthesis　of　Ni(SO4)(0.3)(OH)(1.4)　nanobelt　precursor　and　subsequent　low　temperature　phosphorization　process　under　Ar　atmosphere.　Composed　of　numerous　cross-linked　Ni2P　nanoparticles,　the　as-obtained　Ni2P　nanobelts　exhibit　a　two　dimensional　leaf-like　morphology,　allowing　remarkable　enhancement　of　mesoporosity　as　well　as　active　surface　area.　The　HER　electrocatalytic　test　in　acid　medium　show　a　current　density　of　16　mA　cm(-2)　at　an　overpotential　of　187　mV,　Tafel　slope　of　62　mV　dec(-1)　and　long-term　durability.　Investigation　of　this　Ni2P　nanobelts　as　supercapacitor　materials　in　2M　KOH　electrolyte　display　a　high　specific　capacity　ranging　from　1074　F　g(-1)　at　0.625　A　g(-1)　to　554　F　g(-1)　at　25　A　g(-1),　and　notable　cycling　life　with　86.7%　retention　after　3000　cycles　at　10　A　g(-1).　With　the　simplicity　of　the　synthetic　routine　and　the　outstanding　performance　as　both　HER　catalysts　and　supercapacitors,　the　Ni2P　nanobelts　provide　promising　potential　for　energy　devices.　(C)　2018　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.