Preparation And Its Electrochemical Hydrogen Evolution Properties Of Nickel-Based Nanomaterials

With the development of human society, fossil fuel is consumed seriously, in the future of a century, the world will be confronted with the energy crisis caused by the excessive consumption of fossil fuel. Consequently, the development of new energy is highly desirable problem in the field of energy. Hydrogen has the advantages of abundant raw materials, no pollution and the high calorific value, and is expected to solve the energy crisis. The efficiency of preparation of hydrogen from cracking water is low and need high energy. Although the photolysis of water is extensive in the energy source, low efficiency limits the further development. The electrolysis of water energy can be derived from water power, wind power and other renewable energy sources. This method is expected to be a way to solve the energy crisis in the future. As we all known, in the water electrolysis hydrogen evolution reaction, Pt metal is the best catalyst, but its rarity limits the widely application. So the development of efficient, stable and low cost hydrogen evolution catalysts will be a research interest, but also be a challenge for analyst. In this paper, we carry out the following three works, focusing on the preparation and applications of the Non-noble metal nanometer materials on the Electrolysis of water hydrogen evolution:1. Ni nanoparticles were prepared under the nitrogen protection in the water phase, and use hydrazine hydrate as the reductant. The preparation of the nanometer materials was applied to the electrochemical hydrogen evolution, which showed a efficient electrical activity and good stability. The advantages of this method is based on the low temperature, and the water phase reaction.2. Through the hydrothermal method grow the nanowires(NWs) on nickel foam. Then choosing sodium phosphite as the phosphorus source, Co2 P NWs were synthesized at low temperature phosphidation in the tube furnace. Ni Co P NWs were synthesized with adding the element of Ni. The size of Ni Co P NWsbecame finer and shorter than the size of Co2 P NWs, and also the performance of electrochemical hydrogen evolution was improved of the Ni Co P NWs. The current density can achive-10 m A/cm2 on the 118 m V overpotentials. Almost no loss of current density for continuous running of 48 h under a stable overpotential.3. Previous studies showed that the longer and thicker NWs are more benefit for electrolysis catalytic hydrogen evolution. Therefore, through hydrothermal method the longer and thicker NWs was prepared than the Ni Co P NWs, and we use carbon fiber paper as the substrate, which is against into the acid and alkaline solution. Then the method of electrodeposition was used to generate nickel hydroxide on the NWs. In order to obtain the complex structure of Ni Co2P2 NWs, the method of low temperature phosphidation was used. Then applied to the water electrolysis hydrogen evolution in the acid medium, the NWs showed high performance and low Tafel slope, only 48 m V/dec.