Fabrication Of Iron-cobalt Oxides Nanomaterials And Their Electrochemical Properties Research

Due to their superiority of nanoscale dimensions, nanomaterials emerged a number of new outstanding features in the aspects of heat, optics, magnetics, electricity and mechanics. The advantages of nanomaterials system have also led the system composed of nanoparticles appeared some certain special properties that differs from the macroscopic material system, which makes people for the understanding of natural science system has stepped into a new level. With the development of novel nanomaterials research process, the transition metal oxides and their composites materials draw close attention of public. Because of its excellent performance, transition metal oxides have undoubted significance in electrochemical catalysis and biosensing fields, which resulted from the potential demand and its broad space for development. In addition, graphene has made outstanding contributions to the field of nanotechnology science for its marvelous performance. The complex of metal oxides nanomaterials with graphene makes up for the lack of materials and highlights their respective characteristics, not only expands the research of transition metal nanocomposites but also opens up a more valuable application prospect for novel materials. Based on the above demonstrations, the major contents are described as follows:1. Potentiostatic electrochemical deposition has been utilized for the first time to prepare the iron-doped cobalt oxide nanofilms with certain thickness on the FTO conductive glass substrate. SEM, TEM, XRD, XPS and other methods were used to systematically characterize the morphology, composition, crystalline feature, valence, etc. The effects of different deposition conditions and annealing temperature on both structure and properties of nanofilms have been discussed. Studies have shown that the doping of iron increases the activity center for oxygen catalytic reduction improved the oxygen adsorption properties of the nanofilms.2. Graphite oxide was obtained by improved Hummers method, then r GO/Fe Co composite nanomaterials was fabricated by chemical reduction. The morphology and electrochemical properties were also characterized. The composite nanomaterials modified electrodes were applied for the electrochemical detection of hydrogen peroxide, studies show that the sensor has fast response, wide linear range and low detection limit. This H2O2 sensor has a linear response range of 2.00×10-6 3.20×10-3M, detection limit of 1.0 × 10-7 M（S/N = 3）.3. With simple and easily operated chemical reduction method, r GO/Fe Co composite nanomaterials modified electrode was used to measure Cd²⁺ in environmental water samples by anodic stripping voltammetry. Parameters such as different buffer solution, p H, accumulation potential accumulation time, amplitude and frequency are also investigated on the current intensity of Cd²⁺. The results show that under the optimal conditions, the current response of cadmium ion increased linearly in the concentration ranges of 1.8 × 10-8 1.20 × 10-6 M and 1.2 × 10-6 2.0 × 10-5 M with a detection limit of 5.4 × 10-9 M at 3σ.While this will provide a promising method for the detection of heavy metal ions.