Electrochemical And SERS Studies Of C1 Molecules At Au Hollow Nanospheres Modified Electrode

A common method to improve the catalytic activity of the transition metal(such as Platinum) catalysts is to make them into nanoparticles. But because of the big surface energy of the nanoparticles ,easy to become segregate ,the poor stability ,the short usage time. However ,people supported the catalysts on the high surface of the carbon which could prevent them becoming to lose activity due to the segregation, but the stability and the usage time of the nanoparticles was still not very well. Fortunately ,people have found hollow metal nanaoparticles could not only exhibit superior metal properties in certain scale, but also had applications in nurmous areas such as biomedience, biology, chemical-enginering,due to the stability of the construction of the thin shell struction (such as hollow nanotubes and hollow nanospheres ) in recent years. In the process of preparing the transition metal hollow nanospheres using the template method , the transition metal ions react with the template (such as Selinum) which used as the purpose chemistry and physic purpose, occurring galvanic replacement reaction and at the same time were reduced by the reductant. The transition metal hollow nanospheres(such as Platinum etc.) deposited on the template through the two process had the big surface area ,the high surface energy and the tendency of forming the continous uniform spheres with the core-shell struction and reducing the surface area of the sphere so as to reduce their surface energy.And the tendency come with depleting the core using the chemical or physical method in the whole process, the process didn't come to an end until the sphere shells surface area became smallest, the surface energy reduced to lowest, come to the equation of the energy forming with the hollow, well mono-disperse poly-porous sphere shell structures. The hollow nano-spheres poly holes not only had the stability structure but also had the low density,big surface area good mono-disperse, the size, the controlling thickness, the modifying structure, they were the ideal catalyst material for constructing the new paten of the electrode with the nano-structure.Bai chunLi, Wan Lijun's group and our group research results showed that Pt hollow nanospheres had the higher electrocatalytic activity four the oxidation of methanol than the Pt solid nano-particle. Yan's ect result also show that Pt and Pt-Pd nano-tubes had catalytic activity and stability for the reduction of oxygen than the Pt black and the carbon supported Pt.This paper made use of the amorphous selenium colloid as the template, the Vc as the reluctant, prepared the Au, Pt and Au-Pt alloy nanospheres modified electrode, using common electrochemical method of the CV elt.and electrochemical in-situ SERS technology to discusses the different nano-sphere modified electrode catalytic oxidation of the methanol, formic acid etc. at the different media.