Comparison of the Catalytic Effects of V, V2O5, VN, and VC on the Hydrogen Sorption of Nanocrystalline Mg.

Abstract Nanocrystalline MgH 2 with additions of V 2 O 5 , VN, VC, or high-purity V was produced by high-energy ball milling. The hydrogen absorption and desorption kinetics of these novel materials were determined in order to compare the catalytic effects of the additions. The results show a significant enhancement of the hydrogen reaction kinetics under the chosen experimental conditions only for V 2 O 5 , VN, and VC, while the influence of high-purity V is negligible. This result is discussed with respect to previous reports.