With　hollow　cubic　CoSn(OH)6　as　the　precursor　and　flake　ZIFs　as　the　skeleton,　a　bimetallic　selenide　SCS　consisting　of　CoSe2　and　SnSe　was　prepared　by　selenidation,　which　showed　excellent　sodium　storage　performance.　The　high　capacity　and　excellent　cycle　stability　of　SCS　are　closely　related　to　its　structure.　The　SCS　prepared　in　this　work　is　composed　of　isolated　nanosheets,　on　which　cubic　nanoparticles　are　evenly　distributed.　The　nanosheets　composed　of　CoSe2　and　MOF-derived　carbon　is　assembled　into　a　grid　structure　that　acts　as　a　support　and　separator,　ensuring　the　electrical　contact　of　active　materials　during　the　cycle,　and　reducing　the　agglomeration　of　active　sodium　storage　nanoparticles.　Cubic　nanoparticles　also　inhibit　the　collapse　and　disordered　accumulation　of　nanosheets　during　the　middle　temperature　selenidation　process.　The　isolated　card-shaped　structure　helps　to　maintain　the　stability　of　electrode　structure,　and　the　composition　of　bimetallic　selenides　provides　high　sodium　storage　capacity.　At　high　current　density　of　5　​A　​g−1,　the　discharge　capacity　of　SCS　can　maintain　335　mAh·g−1　after　500　cycles.　©　2023　Elsevier　Inc.