The hydrogen storage performance and catalytic mechanism of the MgH2 -MoS2 composite

In this work, we synthesized MoS 2 catalyst via one-step hydrothermal method, and systematically investigated the catalytic effect of MoS 2 on the hydrogen storage properties of MgH 2 . The MgH 2 -5MoS 2 composite milled for 5 h starts to release hydrogen at 259 & DEG;C. Furthermore, it can desorb 4.0 wt.% hydrogen within 20 min at 280 & DEG;C, and absorb 4.5 wt.% hydrogen within 5 min at 200 & DEG;C. Mo and MoS 2 coexisted in the ball milled sample, whereas only Mo was kept in the sample after dehydrogenation and rehydrogenation, which greatly weakens the Mg-H bonds and facilitates the dissociation of MgH 2 on the surface of Mo (110). The comparative study show that the formed MgS has no catalytic effect for MgH 2 . We believed that the evolution and the catalytic mechanism of MoS 2 will provide the theoretical guidance for the application of metal sulfide in hydrogen storage materials. & COPY; 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

Automated summary

In this study, MoS2 catalyst was synthesized via a one-step hydrothermal method, and its catalytic effect on the hydrogen storage properties of MgH2 was systematically investigated. It was found that MoS2 could significantly enhance the hydrogen release and absorption rates of MgH2, while the formed MgS showed no catalytic effect. The study of the evolution and catalytic mechanism of MoS2 provides theoretical guidance for the application of metal sulfides in hydrogen storage materials.