Enhanced hydrogen storage kinetics in Mg@FLG composite synthesized by plasma assisted milling. (6th September 2018)

• Record Type: Journal Article
• Authors: Lang, Chengguang; Ouyang, Liuzhang; Yang, Lingli; Dai, Leyang; Wu, Daifeng; Shao, Huaiyu; Zhu, Min
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 36(2018)
• Page Start: 17346
• Page End: 17352
• Publication Date: 2018-09-06
• Subjects: Few-layer graphene -- Magnesium hydride -- Dehydriding kinetics -- Plasma assisted milling; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.07.149
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Mg-based materials as potential hydrogen storage candidates, however, are suffering from sluggish kinetics during absorption and desorption processes. Here in this work, embedding Mg particles on few-layer graphene nanosheets (FLG) via dielectric barrier discharge plasma (DBDP) assisted milling was synthesized to improve hydrogen storage properties of Mg particles. The SEM observation demonstrates that Mg particles are distributed uniformly on the surface of the graphite layer in the Mg@FLG composite. The obtained Mg-based composite (Mg@FLG) shows a hydrogen storage capacity of ∼5 wt%. From the isothermal dehydrogenation kinetic curves, the composite could desorb ∼4.5 wt% hydrogen within 25 min at 300 °C. Compared with pure Mg, the dehydriding kinetics of the hydrogenated Mg@FLG composite is significantly elevated, showing an activation energy of 155 J/(mol·K). In addition, the dehydrogenation peak temperature of the Mg@FLG decreases dramatically from 431 to 329 °C for MgH2 . This work implies a promising composite formation technique in Mg-based materials to enhance hydrogen storage kinetics. Highlights: The onset temperature of the hydrogenated Ma@FLG is just 275 °C. The reversible hydrogen storage capacity of the Mg@FLG composite is about 5.2 wt%. The hydrogenated Mg@FLG can desorb 4.5 wt% hydrogen within only 25 min at 300 °C.