To　promote　the　recycling　of　industrial　waste　and　produce　ultra-low　carbon　energy　storage　materials　with　low-energy　consumption　this　work　innovatively　proposes　to　capture　carbon　dioxide　using　the　mixture　made　of　70　wt%　desulphurization　gypsum　and　30　wt%　carbide　slag　via　a　aqueous　solution　method,　and　the　carbonized　mixture　used　as　skeleton　material　to　prepare　phase-change　composites　via　cold　pression　&　hot　sintering　method,　and　then　thermal　property,　mechanical　property　and　chemical　compatibility　are　investigated.　Results　show　that　the　carbon　capture　rate　of　the　skeleton　material　can　reach　up　to　10.6%　at　room　temperature　and　can　encapsulate　the　PCM　(NaNO3)　intact.　C-PCC3　has　good　thermal　stability　and　can　undergo　2058　heating/cooling　cycles.　Compared　with　the　PCC3　(absent　carbon　capture),　the　C-PCC3　exhibited　a　notable　enhancement　in　thermal　conductivity　by　2.7%.　Nevertheless,　there　was　a　decrease　in　mechanical　strength　from　134.1　MPa　to　44.9　MPa,　and　a　reduction　in　thermal　energy　storage　density　from　483.2　J/g　to　459.3　J/g.　Based　on　both　macroscopic　properties　and　microscopic　morphology,　the　phase　change　composite　materials　fabricated　in　this　work　exhibit　excellent　comprehensive　property.　©　2024　Elsevier　Ltd