Abstract
Safe production and widespread application of AlH3 are limited by unstable hydrogen evolution and explosion risk. Alkali (earth) metal compounds, A(E)MCs, are promising materials for inhibiting AlH3 explosions due to abundant reserves, low toxicity, and environmentally friendly. Currently, systematic evaluation of explosion inhibition effect (EIE) and understanding of inhibition mechanism is lacking. This study examines the inhibition behavior of 16 A(E)MCs for AlH3 explosions using thermal properties of A(E)MCs to select inhibitors, and EIE of different groups on AlH3 is analyzed. Notably, KH2PO4 effectively reduces explosion intensity to 0.53 MPa·m/s, with the maximum pressure and maximum pressure rise rate of 0.68 MPa and 4.63 MPa/s. EIE can be quantitatively described by relative changes in particle Al2O3, and preventing the formation of particle Al2O3 can be effective in improving EIE. Combining characterizations and simulation results reveals that A(E)MCs inhibit AlH3 explosions in both chemical and physical ways. Further, the synthesized composite inhibitor KH2PO4/SiO2, which adsorbs flame radicals, reduces explosion intensity by 92.23 % and enhances EIE by 4.33 %. We hope our work can provide theoretical support for the safe application of hydrogen storage materials and the quantitative assessment of EIE.
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