MgH2 based nanocomposites prepared by Cold Forging

• Grant number: 11/21222-6
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): February 01, 2012
• Effective date (End): July 31, 2012
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Tomaz Toshimi Ishikawa
• Grantee: Gustavo Henrique Cozentino
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated scholarship(s): 12/05245-9 - H-Sorption properties of MgH2-based nanocomposites prepared by cold forging, BE.EP.IC

Abstract

The magnesium hydride stands out as a means of store hydrogen in solid form because it has low cost and at the same time, high volumetric energy density (1.5 to 1.6 kWh / l). However, the technological application of this material has been frustrated by the need for high temperatures of hydrogen absorption and desorption and the slow kinetics with which these processes occur. Alloys and composites based on nanocrystalline Mg appear as promising alternative to overcome these problems. In this project, we propose measures to characterize structural and storage properties and kinetics of absorption / desorption of H2 MgH2-based nanocomposites containing different additives. Nanocomposites will be prepared by cold forging (CF, Cold Forging) and a combination of CF and high-energy milling (HEBM, High-Energy Ball Milling), held in tight times. So be prepared samples of low specific surface area, and thus more air resistance, but with refined microstructure. The structural characterization is performed using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission (TEM). Taking measurements PCT (pressure-composition-temperature) analysis and differential scanning calorimetry (DSC) will research the effects of processing and properties of different compositions in storage obtained. Thus correlations are established between the structure, processing and properties of materials obtained in order for hydrogen storage applications.