Monday, November 5, 2007 - 9:20 AM

Hydrogen Storage Equilibrium And Kinetics Of Palladium Nanowires Grown In Anodized Alumina

Asli Ertan and Dr. Orhan Talu. Chemical and Biomedical Engineering Department, Cleveland State University, 2121 Euclid Avenue, Stilwell Hall 455, Cleveland, OH 44115

Hydrogen is considered as a clean and efficient energy source due to its abundance, non-polluting nature and light weight. The hydrogen storage materials are required to have high volumetric and gravimetric capacity. In addition, the storage system must have fast adsorption/desorption kinetics at relatively low temperatures and high tolerance to recyling. Storage of hydrogen in a safe and convenient way is the major issue to be solved to advance hydrogen power systems. Metal hydrides are the most promising materials for hydrogen storage purposes. Nanoparticles have different physical and chemical properties from conventional bulk materials. The ultimate aim of this study is to produce large specific surface area nanostructured metals for hydrogen storage. The large surface area is expected to yield faster hydrogen up-take during charge and also faster desorption during hydrogen release. Among various fabrication techniques electrodeposition has the clear advantages of high growth rates and the use of simple experimental set-up to produce nanostructured materials. Palladium is the ideal candidate to study hydrogen storage kinetics because its bulk hydride properties are well-characterized. Nanostructured palladium metals are grown using potentiostatic electrodeposition technique in the pores of various templates such as commercial alumina membrane, anodized aluminum oxide produced in the lab and mesoporous silica coated alumina membrane. Electrodeposited membranes are characterized by optical microscope, SEM (scanning electron microscopy), XRD (x-ray diffraction), EDX (energy dispersive x-ray analysis). P-T behavior and kinetics of nanoporous palladium metal is determined with the volumetric differential pressure hydrogen apparatus.