Catalytic Effect of Nb2O5 in MgH2-Nb2O5 Ball-Milled Composites

Abstract

We report a study on the desorption properties, crystallography and chemical state of MgH2 and 1 mol% Nb2O5 ball-milled composites. Desorption temperatures of the composites decreased with increase of ball-milling time. Size of MgH2 crystallites decreased during ball-milling. Reduction of Nb2O5 after ball-milling was confirmed by tracing the chemical state of Nb and was further supported by TEM observation. The reduced phases may act as more effective catalysts improving the desorption properties.

Keywords

• MgH2
• Nb2O5
• catalytic effect
• ball-milling