ydrogen absorption/desorption reactions of the (TiVNb)(85)Cr-15 multicomponent allo

Author(s)

Silva, Bruno Hessel ^[1] ; Zlotea, Claudia ^[2] ; Vaughan, Gavin ^[3] ; Champion, Yannick ^[4] ; Botta, Walter Jose ^{[5, 1]} ; Zepon, Guilherme ^{[5, 1]}

Affiliation

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn PPGCEM UFSCar, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Paris Est Creteil, ICMPE, CNRS, UMR 7182, 2 Rue Henri Dunant, F-94320 Thiais - France

^[3] European Synchrotron Radiat Facil ESRF, BP 220, F-38043 Grenoble - France

^[4] Univ Grenoble Alpes, SIMaP, G INP, CNRS, F-38000 Grenoble - France

^[5] Univ Fed Sao Carlos, Dept Mat Engn DEMa UFSCar, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 901, APR 25 2022.
• Web of Science Citations: 0

Abstract

Ti-V-Nb-Cr alloys have been reported as potential candidates for hydrogen storage applications. Investigating the processes of absorption and desorption is paramount to understand the hydrogen storage properties of these novel alloys and to develop more efficient hydrogen storage materials. In this work, we investigated the hydrogen absorption/desorption reactions of the (TiVNb)(85)Cr15BCC multicomponent alloy by laboratory and synchrotron X-ray diffraction, Pair Distribution Function (PDF) analyses, Transmission Electron Microscopy (TEM) and thermo-desorption analyses (TDS). Hydrogen absorption behavior was studied by pressure-composition-isotherm (PCI) at room temperature, which demonstrated levels of absorption around 2 H/M (H/M = hydrogen-to-metal ratio) with low equilibrium pressure. The results showed a multi-step hydrogenation process: alloy <-> BCC solid solution <-> BCC intermediate hydride <-> FCC dihydride. PDF analyses showed that the partially hydrogenated alloy at different levels of HIM and the fully hydrogenated alloy can be reasonably described by models with phases presenting random atomic distribution in the metal crystallographic sites. Moreover, the partially hydrogenated sample prior to the complete formation of the intermediate hydride showed evidence of two co-existing BCC phases. (C) 2022 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 20/07707-6 - Hydrogen storage properties of the TiVNbM (M = Cr, Co e Ni) multicomponent alloys
• Grantee: Bruno Hessel Silva
• Support Opportunities: Scholarships in Brazil - Doctorate