Abstract
AlH3 has a high explosion risk due to rapid hydrogen evolution, and explosion suppression is necessary to reduce explosion hazard. Herein, we apply a common fire extinguishing agent, fluorinated surfactant, to suppress hydrogen in AlH3. This stable composite suppressant has a structure resembling dry water, a dilute aqueous solution of FS-50 encapsulated by fumed phase SiO2, which not only improves suppression effect but also significantly reduces the damage of fluorine to the environment. Fluorinated intermediate radicals F, CF, CF3, CHF, CHF2, etc. produced by decomposition of FS-50 interrupt the chain reaction of flame radicals H, O, OH to produce (-CH2-CF2-)n and stable product HF. Additionally, the outflow of fluorinated compounds mixes with water and SiO2 to form a cladding layer, which prevents heat propagating from the reaction zone to preheating zone. Our work will pave the way for the widespread and safe application of light metal hydrogen storage materials.
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