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Thermochemical materials MgCl₂ and ZnSO₄ have been investigated in depth on larger energy density, chemical stability and larger dehydration/hydration output in view of space heat application. The selection of these materials was based on a recent review on all possible salt hydrates, within the frame of a thermochemical heat storage density and considering current advances in heat storage application. ZnSO₄⋅7H₂O and MgCl₂⋅6H₂O were robust with a specific mixing ratio which upgrade materials to a new level of energy. The as-prepared composites significantly improved cyclability, heat of absorption and desorption. The study suggested that hydration/dehydration performance of Zm₂ composite shows promising ability among various mixing composites ratios. The TG-DSC result highlighted that compare with pure ZnSO₄ and MgCl₂, heat storage performance of derived Zm₂ 40 and 53% increased …