TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The absorbent material comprises the liquid of water, alcohols and its aqueous solutions, aqueous solutions of salts, or aqueous solutions of acids. The solid hydride powder is boron hydride, nitrogen hydride, carbon hydride, metal hydride, nitrogen borohydride, carbon borohydride, nitrogen carbon hydride, metal borohydride, metal nitrogen hydride, metal carbon hydride, metal nitrogen borohydride, metal carbon borohydride, metal nitrogen carbon hydride, nitrogen carbon borohydride and/or metal nitrogen carbon borohydride, preferably sodium borohydride, lithium aluminum hydride, sodium aluminum hydride, magnesium aluminum hydride, calcium aluminum hydride, lithium borohydride, potassium borohydride, beryllium borohydride, magnesium borohydride, calcium borohydride, lithium hydride, sodium hydride, magnesium hydride or calcium hydride. The solid hydride powder is a hydride or substituted boron compounds of formula (BxNyHz). The solid hydrogen releasing catalyst comprises: solid acid; or metal salt/metal nanoparticles/ metal microparticles comprising at least one of ruthenium, cobalt, nickel, copper and iron; or many catalyst metal carriers covered by metal irons/metal atomics/metal nanoparticles/metal microparticles comprising at least one of ruthenium, cobalt, nickel, copper or iron. The phase-change material comprises any one of compounds (listed in table 1-4 of the specification) consisting an organic phase-change material and/or an inorganic phase-change material, where the organic phase-change material includes aliphatic compounds, polyhydric alcohols or paraffin, and the inorganic phase-change material is one of acids or hydrated salts with melting points 15-120.x, y, z = not defined.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The phase-change material, the solid hydrogen fuel and the absorbent material are disposed in a single pack or fuel pack, or the solid hydrogen fuel and the absorbent material are mixed in a single pack or fuel pack, where the phase-change material is disposed outside the single pack or fuel pack and directly contacts a container to place the single pack or fuel pack. The solid hydrogen fuel comprises: a solid hydride powder, which reacts with the liquid in hydrogen releasing reaction; and a solid hydrogen releasing catalyst, which catalyzes the hydrogen releasing reaction to produce hydrogen. Preferred Method: In the method of applying solid hydrogen fuel to fuel cell, the phase-change material is disposed outside the fuel pack and directly contacts a container for placing the fuel pack, and also directly contacts a casing of the fuel cell while the solid hydrogen fuel is applied to the fuel cell.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The solid hydrogen fuel comprises a flexible polymer matrix having a hydrophobic polymer elastomer. The absorbent material comprises absorbing cotton, and an absorbent polymer comprising at least one of polyacrylate, polyvinyl alcohol, vinyl acetate copolymer, polyurethane, polyethylene oxide, or starch graft copolymer/rubber blend. EXAMPLE - No suitable example given.