The Research Of Cobalt Phosphide Composite Materials For Electrochemical Hydrogen Evolution Properties

The serious dependence of fossil energy makes our economy particularly vulnerable to other social factors, and causes the air pollution and global warming at the same time. Therefore, on the basis of rational utilization of fossil energy, developing clean and renewable energy to replace fossil fuels is extremely urgent problem nowadays. Hydrogen energy is high calorific value and no pollution with abundant raw materials. To replace the fossil energy to solve the present situation of energy crisis the current people facing is one of the best selection strategies. However, it was found that exist the problem of low efficiency in the process of electrolysis of water. To solve this problem, the research of hydrogen evolution catalyst has become one of the hot fields. Research has found that Pt-based material is the best metal catalyst to electrolysis of water, but its rarity and expensive problems greatly limit the possibility of a catalyst for large-scale application. Therefore, a series of efficient, stable and low cost of transition metal compounds as catalysts are good choices. Transition metal phosphide which formed by phosphorus atoms into the crystal lattice of transition metal compounds shows good electrical conductivity, high thermal stability, chemical stability and efficient catalytic performance. This thesis mainly focused on the preparation of iron, cobalt, nickel composite bimetallic phosphide nanometer catalysts and their electrochemical performance study. The main points of the thesis were summarized as the following three aspects:1. Based on nickel foam substrate, firstly, using electrochemical deposition method grew a layer double metal hydroxide precursor film on nickel foam, and then through low temperature phosphating method, Fe doped on to CoP nanometer film. It was found that doping of iron improved the catalytic performance of the CoP nanofilm. In addition, under the stable voltage, there was almost no current loss in 28 hours.2. Based on nickel foam substrate, firstly, a layer of two-dimensional nanofilm precursor was grew on nickel foam using electrochemical deposition method, and then Ni doped Co₂P nanofilm by adopting the method of low temperature phosphating. The experimental results revealed that, doping of Ni element improved the catalytic performance. As well as it's stability.3. Firstly, the alkali carbonate nanowires grew on the nickel foam through the hydrothermal method. Then Ni CoP nanowires were synthesized with the low temperature phosphating method. The obtained results showed that Ni CoP nanowires exhibited high electrochemical performance toward hydrogen production in neutral and alkaline medium.