Synthesis, Characterization And Electrocatalytic Properties Of Palladium-based Nanocrystals

Dating back to ancient times,energy was indispensable for the survival of mankind.But traditional fossil fuel has triggered serious environmental problem for inadquate burn and unreasonable exploitation recent years,which compel human to search some one more efficient and chean that would be replace it.As far as we know,the sustainable energy include solar energy,wind energy,geothermy,tidal energy and fuel cell.fuel cell has a wide applications in many fields and was supposed to the leader of energy technology applications that include mobile devices and static electricity.Most catalyst in fuel cells were make up by platinum-based nano materials,but there were many process features as follows:expensive price,slow kinetics,low stability,easy toxication and so on,which largely limited its development.Researchers find that palladium possesse strong affinity and exhibit more catalytic activity than for direct formic oxidation.palladium was hope to take place of platinum because of low cost.Recently,research demonstrate that palladium present more active than commercial black platinum in direct formic acid fuel cell,what's more interseting is that when non-noble metal incorperated with palladium would good to improve the activity and stability.In this study,we developed a simple aqueous method to prepar two kind of palladium nanocrystals,and explore the growth mechanism and electrocatalytic properties.?1?The high-yield,high-dispersity,shape controlled Pd nanodendrites were prepared for the first time through an environmentally friendly,aqueous approach.The PVP-8000 and Glycine played a critical role to the process of formation.There was no template and seed to add in the preparation,Due to the special structure,the Pd nanodendrites exhibited a remarkable catalytic activity and comparable durability relative to commercial Pd black.?2?we developed a simple aqueous method to prepare hierarchical PdCu bimetallic superstructures in the presence of glycine and PVP-8000,the synthesized hierarchical PdCu bimetallic superstructures have a lotus-like shape.Further,investgate the growth mechanism by control the molar ratio of Na₂PdCl₄ to CuCl₂.The electrocatalytic properties of the lotus-shaped PdCu superstructure exhibited good activity and stability towards HCOOH oxidation compared to those of commercial Pd black.