Preparation Of Nanoporous Cu And Its Composites For Catalytic Performance

Porous materials have high surface area, high strength, relatively low density,light weight, heat insulation and good permeability, etc.; Nanoporous materials arenew kind of engineering materials with three-dimensional network structureadvantages over traditional metals. It possesses unique feature such as large surfacearea because of its nanopore’s scale. Besides it retain the basic metal features suchas conductivity, corrosion resistance，fatigue resistance, and act.; It has fascinatingphysicochemical properties， the under-coordinated atoms at the surface and theconfinement of electrons are the cause of novel physical and chemical properties innanostructures. It has the large fraction of just like the electronic, optical andmagnetic properties.it can be used in catalysis, electronics and optical systems. Atpresent, there are two kinds of methods to fabricate nanoporous materials, one isthe template method, and the other one is simple alloy-dealloying method. In thisarticle, I choose the free dealloying to fabricate nanoporous Cu, and synthesizedthe Co3O4nanowires into nanoporous Cu, I explore their electrocatalytic propertiesthrough Linear Sweep Voltammetry (LSV). The follows are the main contents andconclusions:(1) The fabrication of Cu30Mn70alloy ribbons by controlling the corrosiontime, and the thin belt width is about1~2mm. I successfully synthesized thenanoporous Cu through free dealloying by changing the parameters of experimenttemperature, time and solution.(2) I fabricate the nanoporous Cu (NPC) for1h in the0.025,0.1,0.5M HCl，respectively. When the concentration of hydrochloric acid solution is0.025M andthe corrosion time is1h, It can be observed nanoporous pores appeared on thesurface of the Cu3Mn7, With the more concentration of hydrochloric acid solution,the more size of the nanoporous pore. The nanopore is about5nm,12nm,25nm,respectively. (3) Nanoporous copper was prepared by controlling different free corrosiontime, which can be found the microstructures gradually changed at differentcorrosion time. I fabricate nanoporous copper in0.1M HCl for1h,3h,6h,9h. Thenanopore is about12nm,30nm,50nm,90nm, respectively. With the morecorrosion time, the more size of the nanoporous pore and the less Cu ligament. Atthe same time, the porous structure is coarsening. When the corrosion time is9h,the Cu atoms were dissolved and porous structure was damaged to collapse. Theresults indicate that the different morphology of preparation nanoporous Cu due tothe different corrosion time by alloy-dealloying method.(4) In order to get the nanoporous Cu which is composed of about1.5um Culigament and about200nm nanopore. I choose the concentration of hydrochloricacid solution is0.5M and the corrosion time is1h. I synthesized Co3O4on thenanoporous Cu (NPC/Co3O4) via a simple hydrothermal process. We can get thethree-dimensional network structure.(5) I do the experiment about the The Linear Sweep Voltammetry (LSV) forbare nanoporous Cu and NPC/Co3O4in different electrolyte at the scan rate of1mV was tested in the potential range from0to0.8V at current densities of1mm2.The results indicate that the new kind of engineering materials with large specificsurface area and high electrical conductivity make the great interests to exploretheir properties.