Hydrogen storage properties of the MgTiVZrFe high entropy alloy

• Grant number: 18/25154-4
• Support type: Scholarships abroad - Research Internship - Scientific Initiation
• Effective date (Start): March 01, 2019
• Effective date (End): June 30, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal researcher: Guilherme Zepon
• Grantee: Vinícius Aranda
• Supervisor abroad: Jacques Huot
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Research place: Université du Québec à Trois-Rivières (UQTR), Canada
• Associated to the scholarship: 17/16273-7 - Reactive milling and hydrogen storage properties of high entropy alloys of the Mg-Ti-Zr-V-Fe-Co-Ni system, BP.IC

Abstract

Developing safe, reliable, efficient and cost-effective materials for hydrogen storage is a scientific and technological challenge that must be overcome to leverage a clean and renewable hydrogen-based energy system. Several papers have shown that metal hydrides, such as MgH2 and TiFeH, for instance, are promising materials for this application. Recently, it was shown that the equiatomic TiVZrNbHf high entropy alloy (HEA), which crystallizes as a single multicomponent solid solution, is capable to store 2.5 hydrogen atoms per metal atom, which is considerably higher than conventional metal hydrides such as MgH2. Previous results from our research group demonstrated that the MgZrTiFe0.5Co0.5Ni0.5 HEA also has interesting hydrogen storage properties. In the first part of this scientific initiation project, a new HEA composition with interesting hydrogen storage properties was developed, namely MgZrTiVFe. This alloy was capable to absorb up to 2.0%wt. of hydrogen in 1 hour under 350 ºC and 7.8 MPa of H2 pressure. The project proposed for this research internship abroad aims at evaluating the hydrogen absorption/desorption cycling behavior of this new alloy. This project will be carried out at the Hydrogen Research Institute of the Université du Québec à Trois-Rivières in Quebec, Canada, a worldwide renowned institute in the field of materials for hydrogen storage. (AU)