Layered Composite Metal Hydroxide Catalytic Electricity In Neutral Medium

Water splitting is considered to be one of the most promising new energy because of its high efficiency, low emission characteristics in the future, but at present the most commonly used precious metals platinum catalyst due to the limited resources by limits the further application, so developing a highly active non-noble metal catalysts means important practical significance. Such catalytic electrode core for anode oxygen evolution reaction (OER). The oxygen evolution reaction is usually carried out under the high overpotential, before this potential, a lot of metal has begun to dissolve, or oxidation, and OER existing catalyst role mainly in alkali or acid medium, and OER existing catalyst role mainly in alkali or acid medium. At present, a lot of non-noble metal catalyst for OER cobalt-based phosphate as the core, always in the catalytic process within the corresponding buffer solution, the performance of different cobalt base material and lack of mechanism to explain the stability of the gap, and the research on the electrochemical properties within the buffer solution. In view of these challenges, in this paper the preparation of the cobalt iron of layered double hydroxide metal materials, using of hydrotalcite synthesis of new materials to be used under neutral medium oxygen precipitation catalytic process, and studied the using performance of catalyst for oxygen precipitation reaction. The main results of the experiments are present as follows:1. We use the nucleation crystallization method to successfully made LDH which present good crystal shape, particle morphology of uniform, basic without impurities and Co/Fe molar ratio of 2:1 with CO32" in the layer of CoFe LDH nanocomposites material. This nanocomposite was applied to the neutral solution of oxygen precipitation in the catalytic reaction and with the corresponding spinel oxides and single metal hydroxide. Product compared with spinel or hydroxyl nanomaterials such as specific surface area is bigger, after coating the surface roughness, active site is more outstanding, catalytic OER in neutral phosphate buffer solution with low starting voltage and high current density and the advantages of lasting stability, its performance is close to catalyst reported in the literature. Overpotential TOF value can reach 0.108 s-1 at 0.6 V, the highest reported. Its excellent catalytic ability is attributed to more exposed Co loci and special layer board characteristics of hydrotalcite, which means the ideal OER the catalytic materials. Using this simple and rapid and low energy consumption process to mass production and non-noble metal catalysts for OER, it really has a great potential in industrial application.2. Changing the neutral test solution conditions of CoFe LDH changing。Under different concentrations of phosphate neutral buffer solution was studied, and the same concentration of inorganic salt under neutral the buffer solution of hydrotalcite OER electric catalytic performance, trying to sum up the CoFe LDH in neutral buffer OER condition in the catalytic mechanism of the buffer solution system, and found that LDH materials than cobalt-based phosphate material within the buffer solution has the advantages of high current stability. And on this basis to further explore the LDH OER the application prospect in natural seawater, the catalytic material with the characteristics of high efficiency of Faraday and long constant output, and almost won’t produce the chlorine gas.