Synthesis And Properties Of Nanometer Array Electrodes Based On Anodic Aluminum Oxide Template

Because of its high energy density(5.42 Wh. G-1), strong theoretical electromotive force(1.61V), good theoretical energy conversion efficiency(100%) and pollution-free, direct hydrazine fuel cell(DHFC) has got a wide attention.In this paper, anodic aluminum oxide(AAO) was prepared by two steps of oxidation, its channels are evenly and orderly,its aperture is 60 ~ 80 nm, the density of the hole is about 1010 / cm2. Using anodic aluminum oxide(AAO) as the template, Pt, Pd and Ag nanowires were prepared by direct current deposition. Using scanning electron microscopy(SEM), transmission electron microscope(TEM), EDS and X-ray diffraction(XRD) analysis shows that the surface of nanowires is smooth, its thickness is uniform, and filling rate of stencil aperture is higher. Three kinds of metal nanowires all have polycrystalline structure, the diffraction patterns have no other obvious impurity peak, and they are all elemental metal nanowires.The Pt, Pd, and Ag nanowires are made into corresponding nanowires array electrodes respectively. Using cyclic voltammetry and chronoamperometry, the electric catalytic oxidation properties of electrode arrays for hydrazine was studied, and compared with corresponding plate electrode. Studies have shown that Pt, Pd and Ag electrode arrays all showed certain electric catalytic oxidation ability for N2H4, comparing with plate electrode, they have the higher catalytic oxidation activities. Finally, why nanowires have higher catalytic activity has been analyzed.At the same time, under different conditions, the properties of electric catalytic oxidation of Pt, Pd, Ag nanowires array electrodes for hydrazine was analyzed by cyclic voltammetry. It was shown that hydrazine concentration in the solution is higher, the three nanowires array electrodes on the activity of catalytic oxidation of hydrazine was increased; with increased scanning speed, nanowires array electrode for catalytic oxidation activity of hydrazine also increased, and each oxidation peak value is proportional to the scan rate v1/2.Finally, it was shown that catalytic oxidation of nanowires array electrodes for hydrazine have better stability and tolerance by using the chronoamperometry method.