This study investigates the preparation of polyetherimide (PEI) – LaNi
5 composites films for hydrogen storage. Prior to the polymer addition, LaNi
5 was ball-milled at different conditions (250, 350, and 450 RPM) and annealed at 500 °C for 1 h under vacuum. The composites were produced with BM-LaNi
5-350 (PEI/LaNi
5-350) and annealed BM-LaNi
5-350 (PEI/LaNi
5-350-TT). Membranes were successfully produced through solvent casting assisted by an ultrasonic bath. The particles dispersion and the film morphology did not change after hydrogenation cycles. In the H
2 sorption experiments at 43 °C and 20 bar, the films stored H
2 without incubation time; both samples reached a capacity of ~0.6 wt%. The H
2 sorption kinetics of PEI/LaNi
5-350 was comparable to that of BM-LaNi
5-350, whereas PEI/LaNi
5-350-TT presented significantly slower kinetics. LaNi
5 oxidation was hindered by PEI, showing that it can be explored to improve metal hydrides air resistance. The results demonstrated that PEI films filled with LaNi
5 are promising materials for hydrogen storage.
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