1. Nanocrystalline Al-Mg alloys for hydrogen storage Fereshteh Ebrahimi, University of Florida, DMR 0605406 Motivation and Objectives The expected scarcity of fossil fuels in the future has become a driving force for the research in many non-conventional sources of energy. Transportation sector is a major consumer of energy and counts for almost two-thirds of the U.S. oil consumption. Hydrogen storage is one of the main issues in implementation of on-board fuel cells. Hydrogenation of Al-Mg alloys can lead to the formation of three hydrides: AlH 3, Mg(AlH 4 ) 2 and MgH 2. Our objectives are to fabricate nanocrystalline Al-Mg alloy powders as hydrogen storage materials and study their hydrogenation/dehydrogenation characteristics. Educational Component  Graduate Students: The following students were trained on using several advanced equipments and in conducting research.  Sankara Sarma V. Tatiparti  Mahesh Tanniru  Undergraduate students (REU Program): The following students conducted research for three months during summer semester, 2007.  Chamoria clark – A female minority student who is continuing conducting research in our lab.  Nathan Hicks – A senior at MSE/UF. Collaborators  Dr. Darlene Slattery, co-PI, FSEC, Florida  Dr. Wu, Environmental Eng. Dept., University of Florida

2. Nanocrystalline Al-Mg alloys for hydrogen storage Fereshteh Ebrahimi, University of Florida, DMR 0605406  We have been successful in fabricating nanocrystalline Al- Mg powders with various compositions.  The powders consist of supersaturated FCC-Al and HCP-Mg solid solutions. 200μm 5μm 0.2μm HCP-Mg (Al) 0.2μm Coarse FCC-Al (Mg) 20μm 0 20 40 60 80 100 020406080100 Distance (  m) At.% Mg FCC-Al (Mg) HCP-Mg (Al) 0.2μm Fine FCC-Al (Mg)

3. Nanocrystalline Al-Mg alloys for hydrogen storage Fereshteh Ebrahimi, University of Florida, DMR 0605406 Publications and Presentations 1.Sankara Sarma V. Tatiparti and Fereshteh Ebrahimi, “Electrodeposition of Al-Mg Powders”, submitted to ECS journal, August 2007. 2.F. Ebrahimi, A. J. Liscano, D. Kong, Q. Zhai and H. Li, Rev. Adv. Mater. Sci., 2006, Vol.13, 33-40. 3.F. Ebrahimi and H. Li, Journal of Materials Science, 2007, Vol.42, 1444-1454. Invited 4.F. Ebrahimi, “Fracture of Bulk Face Centered Cubic (FCC) Metallic Nanostructures”, Mechanics of Advanced Materials, International Russia-US Workshop, St. Petersburg, Russia, 2006. Invited 5.F. Ebrahimi, S. Tatiparti, M. Tanniru and D. Slattery, “Development of Nanocrystalline Al-Mg Alloys for Hydrogen Storage” MRS Fall Meeting, Boston, MA, 2006. 6.S. Tatiparti and F. Ebrahimi, “Electrodeposition of Nanocrystalline Aluminum-Magnesium Allloys”, Gordon Research Conference on Electrodeposition, New London, NH, 2006. 7. S. Tatiparti and F. Ebrahimi, “Fabrication of Nanocrystalline Al-Mg Alloy Powders by Electrodeposition for Hydrogen Storage”, TMS Annual Meeting, Orlando, FL, 2007. 8.F. Ebrahimi, S. Tatiparti, M. Tanniru and D. Slattery, “Hydrogenation of Electrodeposited Al-Mg Alloy Powders”, TMS Annual Meeting, Orlando, FL, 2007. T = 100°C uptake T = 150°C release  Preliminary results suggest fast hydrogen uptake and release at relatively low temperatures.