Solid–State Hydrogen Storage Materials with Excellent Selective Hydrogen Adsorption in the Presence of Alkanes, Oxygen, and Carbon Dioxide by Atomic Layer Amorphous Al2O3 Encapsulation

W4415488455 · 수집 2026-10-04 18:16:49

T11007 Hybrid Renewable Energy Systems

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Metal hydrides with high hydrogen density provide promising hydrogen storage paths for hydrogen transportation. However, the requirement of highly pure H2 for re-hydrogenation limits its wide application. Here, amorphous Al2O3 shells (10 nm) were deposited on the surface of highly active hydrogen storage material particles (MgH2-ZrTi) by atomic layer deposition to obtain MgH2-ZrTi@Al2O3, which have been demonstrated to be air stable with selective adsorption of H2 under a hydrogen atmosphere with different impurities (CH4, O2, N2, and CO2). About 4.79 wt% H2 was adsorbed by MgH2-ZrTi@10nmAl2O3 at 75 °C under 10%CH4 + 90%H2 atmosphere within 3 h with no kinetic or density decay after 5 cycles (~ 100% capacity retention). Furthermore, about 4 wt% of H2 was absorbed by MgH2-ZrTi@10nmAl2O3 under 0.1%O2 + 0.4%N2 + 99.5%H2 and 0.1%CO2 + 0.4%N2 + 99.5%H2 atmospheres at 100 °C within 0.5 h, respectively, demonstrating the selective hydrogen absorption of MgH2-ZrTi@10nmAl2O3 in both oxygen-containing and carbon dioxide-containing atmospheres hydrogen atmosphere. The absorption and desorption curves of MgH2-ZrTi@10nmAl2O3 with and without absorption in pure hydrogen and then in 21%O2 + 79%N2 for 1 h were found to overlap, further confirming the successful shielding effect of Al2O3 shells against O2 and N2. The MgH2-ZrTi@10nmAl2O3 has been demonstrated to be air stable and have excellent selective hydrogen absorption performance under the atmosphere with CH4, O2, N2, and CO2.

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