TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Structure: The structure further comprises: a water-absorption material surrounding the hollow fuel blocks. The structure further comprises: a hot melt powder (5-20 wt.%), solid acid powder (5-20 wt.%), and catalyst added to at least one of hollow fuel blocks. The structure further comprises solid acid powder, first catalyst and second catalyst, where the hollow fuel blocks comprise first fuel block, a second fuel block, and a third fuel block, the solid acid powder is added to the first fuel block, the first catalyst is added to the second fuel block, the second catalyst is added to the third fuel block, and the first catalyst and the second catalyst are different in kind; solid acid powder, a first catalyst, and a second catalyst, where the hollow fuel blocks comprise a first fuel block, a second fuel block, and a third fuel block, the solid acid powder is added to the first fuel block, the first catalyst is added to the second fuel block, the second catalyst is added to the third fuel block, and the first catalyst and the second catalyst have different concentrations. Preferred Method: The method further involves adding a solid acid powder to the mixture of the non-woven fibers, the hot melt powder and the solid-state reactant. Preferred Components: The solid-state reactant for hydrogen production comprises at least one of sodium borohydride, magnesium hydride, calcium hydride, and aluminum powders. The catalyst comprises at least one of cobalt (Co), cobalt boride (CoB), dicobalt boride (Co2B), cobalt diboride (CoB2) and dicobalt triboride (Co2B3).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The water-absorption material comprises at least one of absorbent cotton, hydrophilic porous material, an acid porous material, an alkaline porous material, melamine, trimeric cyanamide, foam, cotton, and fibers. The solid acid powder comprises at least one of malic acid, citric acid, sulfate, phosphates, and metal salt.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The non-woven fibers comprise core-sheath fibers and each of the core-sheath fibers comprises: core layer having a first melting point; and a sheath layer surrounding the core layer and having a second melting point, where the first melting point is higher than the second melting point. The non-woven fibers comprise at least one of rayon fibers and polymer fibers.