Hydrogen sorption properties of compounds based on BCC Ti1-xV1-yCr1+x+y

International audienceAmong the hydrogen storage materials, BCC structures type materials such as V-based alloys reveal promising characteristics due to there reactivity with hydrogen at ambient temperature. A systematic XRD study was performed in order to obtain a cell parameter-composition map in the BCC domain and attempt a correlation with the sorption properties. However, activation of this type of materials may not be straightforward. The aim of this study was to co-melt a main BCC phase with a minor metallic one acting as activating phase. The synthesis of co-melted materials with a specific microstructure start- ing from Ti1-xV1-yCr1 + x + y (x < 0.4, y < 0.3) and Zr7Ni10 alloys was successfully realized. The hydrogen decrepitation of the compound was studied in correlation with its microstructure. Pressure-composition- isotherms were recorded, the absorption and desorption isotherms measured as a function of time (sorption kinetics measurements) show reversible hydrogen uptake up to 2 wt.%