Due　to　the　slow　kinetics　of　the　hydrogen　evolution　reaction　(HER)　and　the　oxygen　evolution　reaction　(OER),　designing　an　efficient　and　stable　electrocatalyst　is　crucial　for　improving　the　overall　water　decomposition　efficiency.　In　this　study,　a　hollow　nanotube　NiSe2/MoSe2/NiMoO4@CoSe2-NC　encapsulated　by　CoSe2-embedded　N-doped　carbon　dodecahedral　particles　was　successfully　designed　and　synthesized　through　structural　engineering,　heteroatom　doping　strategies,　and　selenization　reactions.　The　unique　heterostructure　formed　by　integrating　the　hollow　nanotubes　architecture　with　dodecahedral　particles　provides　abundant　active　sites,　thereby　accelerating　the　water　electrolysis　reaction　kinetics.　Furthermore,　NiSe2/MoSe2/NiMoO4@CoSe2-NC　demonstrates　superior　bifunctional　performance　in　alkaline　media　(1.0　M　KOH),　achieving　low　overpotentials　of　101　mV　for　HER　and　264　mV　for　OER　at　10　mA　cm−2,　with　corresponding　Tafel　slopes　of　63.1　and　58.8　mV　dec−1,　respectively.　When　employed　in　a　two-electrode　alkaline　electrolyzer　assembled　with　this　catalyst,　a　cell　voltage　of　only　1.55　V　is　required　to　deliver　a　current　density　of　10　mA　cm−2.　At　high　current　density,　it　surpasses　the　benchmark　RuO2||Pt/C　system　in　both　performance　and　cost　while　maintaining　excellent　stability.　©　2025　Hydrogen　Energy　Publications　LLC