Synthesis of nano-meter sized Core/Shell Bimetallic Clusters and their Hydrogen Uptake Capacity

Diaa Aref and Mohammed Suleiman

The main purposes of this work are size selective synthesis bimetallic core-shell clusters,such as Mg-Pd cluster with size range (2-10 nm), by using salt reduction-electrochemicalcombine technique, and investigating the effect of varying the preparation parameters, intothe size and structure of the prepared bimetallic clusters, and investigating the hydrogenuptake capacity of these bimetallic nanoparticles.In the proposed project the hydrogen solubility in different metallic clusters with discretesizes should be investigated. Ideal candidates to be researched are surfactant stabilizedclusters, which are tension-free stabilized and have a narrow size distribution. In this projectthe clusters will be Bimetallic (Mg/Pd) core/shell clusters.In this work the preparation of bimetallic core/shell nano-particles will be performed byusing salt reduction-electrochemically combined technique. This method is simple and cheap,other advantages of this method is that nano-particle size can be easily controlled by varyingthe preparation’s parameters, such as Temperature, distance between the electrodes,electrolysis current, and solvents. That means (size selective method).These bimetallic clusters are expected to have a good solubility and capacity to storagehydrogen, and a high stability too. Because both of magnesium and palladium metals have avery high ability to uptake hydrogen atoms and forming hydrated metals. Whereasmagnesium is unstable metal-hydrides formation (has a high enthalpy of formation (MgH2)thus it is stabilized with alloyed by other stable transition metals as Ni or Al, or by formationof bimetallic clusters with one metal be used to enhance the kinetics of hydrogen absorptionby reducing the large activation barrier that magnesium inherently possesses that ispalladium metal.Then we will study the influence effecting on the hydrogen storage in these bimetallicclusters and how we can be able to promoting the adsorption/desorption processes withchanging the size or M-M ratio into core-shell bimetallic clusters.In this work the hydrogen uptake capacity in nano-meterd sized bimetallic clusters withdifferent sized and different structure will be determined isothermally from volumetricsolubility measurements.