Developing　novel　non-precious　metal-based　catalysts　is　crucial　to　achieving　low-cost,　stable,　and　industrial-grade　overall　water　splitting.　Although　NiSe2　shows　significant　promise　as　an　electrocatalyst　due　to　its　excellent　electrical　conductivity　and　stability　in　acidic　and　alkaline　environments,　its　performance　is　limited　by　inherently　poor　activity.　In　this　study,　a　nanorod-shaped　CoxNi1-xSe2@Co(OH)2/nickel　foam　(CNSC/NF)　alkaline　water-splitting　catalyst　was　constructed　in　situ　through　a　hydrothermal-γ　radiation　method.　The　γ　radiation　imparted　NiSe2　with　an　“island-like”　amorphous/crystalline　heterostructure　and　a　high　density　of　atomic-level　Ni-Se-Co　electron　bridge　structures.　The　dense　“ball-stick”　configuration　and　heterointerfaces　in　CNSC/NF　jointly　enhanced　structural　stability　for　ampere-level　water　splitting.　CNSC/NF　achieved　a　current　density　of　1　A　cm–2　at　a　cell　voltage　of　only　2.15　V　for　over　1000　h　under　rigorous　working　conditions.　Experimental　and　theoretical　analyses　revealed　that　the　amorphous　Ni-Se-Co　electron　bridges　triggered　asymmetric　d-p-d　orbital　hybridization　via　electron-directed　transfer,　effectively　facilitating　H2O　dissociation　and　adsorption　for　*H/*OOH　intermediates.　The　rapid　oxidative　reconstruction　of　active　Ni-Se-Co　sites　further　improved　the　intrinsic　activity.　This　work　proposes　a　convenient　strategy　to　fabricate　an　efficient,　durable　NiSe2-based　catalyst　and　provides　insights　into　the　effects　and　evolution　of　amorphous　atomic　doping　during　water-splitting　process.　©　2025　Elsevier　B.V.