Effect of nano-structured Ta2C on hydrogen absorption−desorption kinetics of Mg−H2 system. (20th September 2019)

• Record Type: Journal Article
• Authors: Xu, C.; Zhang, Q.A.
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 45(2019)
• Page Start: 24792
• Page End: 24799
• Publication Date: 2019-09-20
• Subjects: Mg-based composite -- Ball milling -- Hydrogen storage kinetics; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.06.216
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: High purity Ta2 C was successfully prepared and the hydrogen absorption−desorption kinetic properties of MgH2 −10 wt% Ta2 C composites were investigated systematically. It was found that the hydrogen absorption of Mg−10 wt% Ta2 C (20 nm) composite takes about 5 min to reach saturation at 573 K, and its hydride fully desorbs hydrogen within 15 min at 623 K. These kinetic properties are much better than those of the undoped Mg and MgH2 prepared under the same condition, respectively. The improvement in the hydrogen storage kinetics is ascribed to the catalytic effect of Ta2 C and its inhibition role in crystallite growth. Highlights: Mg−Ta2 C composite has enhanced hydrogen absorption-desorption kinetics. Ta2 C inhibits growth of Mg/MgH2 crystallites during hydrogen sorption process. Ta2 C provides a catalytic effect on hydrogen sorption of Mg–H2 system. Fast kinetics is ascribed to inhibition role and catalytic effect of Ta2 C.