The First International Palestinian Conference on Nanotechnology for Advanced Material and Devices

Mohammed Suleiman Shtaya's picture
Research Title: 
Synthesis of Nano-Meter Sized Magnesium/Palladium Core/Shell Bimetallic Clusters and Their Hydrogen Uptake Capacity
Diaa Aref
Mohammed Suleiman
Sat, 2012-12-01
Research Abstract: 

Hydrogen energy is an ideal renewable energy for as-present and future energy sources because its energy is highly efficient with no harmful emissions compared with fossil fuels [1]. But it still needs many technologies in implementations. One of these is the suitable hydrogen storage system. There are mainly three ways for hydrogen storage, including: high pressure gas, in its liquid phase as a high cryogenic liquid, or in solid materials. Both of the high pressure and liquid phase hydrogen storage systems were considered inconvenient due to their efficiency, safety, and economic problems, in addition to the large energy consumption in liquidation hydrogen gas and in low temperature keeping [1,2], at present the solid materials for hydrogen storage well on way to explore or create the most suitable material for this purpose. Both Magnesium and palladium metals have a remarkable hydrogen uptake capacity under proper conditions. Palladium uptakes hydrogen more like the sponge when absorbing the water molecules [3] and Magnesium is considered the most promising metal for hydrogen storage material in terms of 7.6% (wt%) of hydrogen that can be up taken [4]. Unfortunately a several drawbacks were emerged on the scene when they have been applied. Palladium is a heavy metal and magnesium has problems in hydrogen diffusion and releasing processes makes them not suite to be used as hydrogen storage materials. The combining of the both metals (Mg & Pd) have explored a promising properties and could be the solution for their H-storage drawbacks, through catalyzing the hydrogen adsorption/desorption process for magnesium and reducing the weight by lowering the amounts of Pd in the solid matrix. In this project a nano-sized particles with specific morphology, recently is known as core/shell was synthesized from magnesium and palladium metals by combined salt reduction – electrochemical technique, which is considered as simple, cheap, and reliable method for size and size-distribution manipulating. In this preparation method the magnesium ions was reduced from one of its salts to produce a nano-sized particles which is in turn serves as a seed of growth for the reduced palladium atoms from its anode to form at the end a nano-sized clusters with core rich of magnesium atoms and shell rich of palladium atoms. As shown in Fig. (1), which observes the results of the characterization techniques (TEM, XRD, AAS and EDS) of the as-prepared clusters. Thereafter, the hydrogen absorption and desorption behavior from both Pressure-concentration-temperature isotherm (PCT) and kinetic; kind of view were investigated with Gravimetric analysis by using high-vacuum electronic microbalance, Fig. (2) Observes the kinetic absorption and desorption processes for the hydrogen in the as-prepared cluster.