Abstract
The hydrolysis properties and air-stability of MCH-based material improved by ball-milling with NH4Cl are investigated. Both the Mg-Ca hydride (MCH) and the MCH-NH4Cl composites are characterized by XRD, SEM. The effects of morphology of materials, system temperature and air exposure time on hydrolysis behavior have been discussed. The addition of NH4Cl by ball-milling significantly enhances the hydrolysis performance. The MCH-5%NH4Cl composite (powder) milled for 0.5 h displays the highest hydrogen yield of 1006 mL g−1(com) at 25 °C without stirring, and has the fastest hydrogen generation rate (872 mL g−1(com) min−1 in the initial 1 min). The air-stability of the MCH-based material significantly increases when being pressed into plate with NH4Cl due to the reduction of the contacting areas to the air and hygroscopicity of NH4Cl. The hydrogen yield of the MCH-5%NH4Cl composite plate still reaches 726 mL g−1(com) at 25 °C without stirring when being exposed to the air for 5 h with 80% humidity at 30 °C. These characteristics demonstrate that the MCH-NH4Cl composites in plate can be a promising and practicable hydrogen generation material on portable power supplies.
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