2D　MXene　nanohybrid　is　a　next-generation　energy-storage　material.　Here,　we　demonstrate　a　novel　thermochemical　heat　storage　material　using　magnesium　sulfate　heptahydrate/titanium　carbide　and　MXene　(MgSO4/Ti3C2Tx)　with　improved　hydration/dehydration　enthalpy,　superior　thermal　conductivity,　good　cyclic　ability,　maximum　water　sorption　performance,　and　larger　thermal　energy　conversion.　The　TG-DSC　fitted　with　a　Wetsys　flow　humidity　generator　shows　outstanding　thermal　performance　and　larger　hydration　for　MgSO4/Ti3C2Tx　(1963　J/g)　and　dehydration　(1861　J/g)　enthalpies　with　5　%　fluctuation　as　compared　to　pure　MgSO4　(38　%).　The　cyclicability　results　showed　that　MgSO4/MXene　has　good　stability　of　TCMs　across　several　charging/discharging　cycles　(up　to　20　cycles),　confirming　that　the　MXene　matrix　avoids　hydrated　salt　agglomeration　and　displays　an　average　of　12　%　fluctuation.　This　illustrates　that　prepared　composites　potentially　improve　storage　performance.　The　MgSO4/Ti3C2Tx　nanohybrid　exhibit　a　better　radiation　absorption　and　45　%　longer　backup　than　the　pristine　MgSO4　salt.　TEM　study　revealed　that　maximum　salt　contents　can　be　located　in　the　interlayer　gaps,　predicted　sheets　thickness　of　the　MgSO4/MXene　layer　to　be　16　Å　and　the　Ti3C2Tx　layers　to　be　7.3　Å.　Nanohybrid　has　stronger　water　sorption　than　MgSO4　due　to　MXene　nanosheets　larger　interlayer　gaps.　The　results　conclude　that　the　resultant　MgSO4/MXene　has　excellent　long-term　thermal　energy　storage,　photo-to-thermal　conversion　and　larger　water　sorption　performance.　The　study　validates　the　effectiveness　of　nanohybrid　material　as　a　promising　candidate　for　thermochemical　heat　storage　applications　and　set　to　pave　the　way　to　explore　other　hybrid　systems　to　improve　the　efficiency　of　thermochemical　energy　storage　systems.　©　2022　Elsevier　Ltd