Abstract: A hydride bed structure includes a first and second set of separated hydride modules within a single hydrogen containing, sealed tank. Each set contains a hydride having a different equilibrium disassociation characteristic. Each set is thermally isolated from the other and the enclosing tank by a hydrogen permeable, thermally insulating material. The hydride in each set is divided into a plurality of spaced apart clusters with each cluster disposed in a respective concave cavity defined in one side of a sheet of thermally conductive material. A hydrogen porous, hydride impermeable member seals each cluster within the respective cavity. The convex side of the cavity protrudes into a thermal media transfer cavity on the opposite side of the sheet. The spacing and arrangement of the cavities/protrusions define a channel array between the protrusions. A pan member is bonded to the opposite side of the sheet and defines the thermal media cavity shaped to receive the protrusions therein.