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In operando study of TiVCr additive in MgH2 composites |
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| Authors: | Laetitia Laversenne Jerome Andrieux Damien Plante Laurence Lyard Salvatore Miraglia |
| Affiliation: | 1. Institut Néel, CNRS et Université Joseph Fourier, BP 166, 38042 Grenoble, France;2. Harvard University, School of Engineering and Applied Science, 02139 Cambridge, MA, USA;3. ID15, ESRF, 6 rue Jules Horowitz, 38043 Grenoble, France;4. Université de Lyon, CNRS-UMR 5615 LMI, Lyon, France |
| Abstract: | We report an in operando study of the hydrogenation and dehydrogenation of MgH2–TiVCr composites. The experiment was performed by means of in situ synchrotron XRD in order to get insights on the influence of the TiVCr additive on the sorption properties of the MgH2 based composite. Sequential Rietveld refinement analysis was performed to investigate the structural changes of MgH2 and of the additive during hydrogenation and dehydrogenation processes. Significant non-monotonic changes in the lattice volume of the TiVCrHx solid solution were observed concomitantly to the MgH2 formation or decomposition. These volume changes are assigned to the variation of the hydrogen content in TiVCrHx. These results provide evidence of cooperative effects between the H2 storage material and the additive. |
| Keywords: | Hydrogen storage Magnesium hydride TiVCr additive Catalytic effect In situ Synchrotron XRD |
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