Composite Materials Containing Tungsten Phosphide and Tungsten Carbide for Electrolysis Hydrogen

Among all kinds of renewable energy and clean energy, hydrogen energy is one of the ideal clean energy. It has the advantages of high combustion efficiency, rich resources, no pollution and relatively cheap cost. Hydrogen has a variety of preparation methods. Hydrogen production by electrolysis is the most commonly used method at present. In order to make hydrogen production by electrolysis water, For commercial applications, hydrogen evolution catalyst materials with high catalytic activity must be developed.

The most commonly used catalytic materials for hydrogen evolution are platinum based precious metals. The platinum system elements belong to low overpotential metals and have high catalytic activity for the electrolysis of hydrogen evolution. In order to effectively replace the platinum system precious metals, it is urgent to develop a cheap electrochemical catalyst with high electrocatalytic hydrogen evolution efficiency. The idea of introducing hetero atoms into multiphase tungsten matrix composites has been widely applied. The multiphase tungsten based composites can make use of the interaction between different phases, which complement each other and modify the structure of the catalyst. This method can effectively increase the electrocatalytic active site of the material and greatly improve the electrocatalytic performance of the material. The preparation strategy of multiphase electrocatalytic materials has been widely used and has made great progress.

Obtaining tungsten phosphide by simple, green and effective method will be the key to preparing tungsten matrix composites containing tungsten carbide and tungsten carbide. Through the extensive study of organic-inorganic hybrid materials, the researchers constructed organic-inorganic hybrid materials with phosphotungstic acid and 2,6- two amino pyridine, then one step calcined to achieve a simple, non-toxic method to prepare tungsten based tungsten based composite materials with tungsten based composites. This method, which provides both a phosphorus source and a tungsten source by a reactant, and finally generates tungsten matrix composites containing tungsten phosphide, successfully solves the above problems. At the same time, due to the introduction of low electronegativity of hetero phosphorus in the catalytic materials, the density of the electron cloud in the tungsten metal D orbit is increased and the active sites are increased. The tungsten based composites containing tungsten phosphide and tungsten carbide have a good catalytic performance for hydrogen evolution. The examples are as follows:

The 1g phosphotungstic acid was dissolved in 40mL deionized water and stirred evenly, the reaction solution A was obtained. The 6G 2,6- two pyridine was dissolved in 100mL deionized water and stirred evenly to obtain B. The reaction solution B 100mL was placed in the atmospheric separation funnel and was added to the 40mL reaction solution A by drop. The 24h was stirred continuously at room temperature. After the reaction was finished, the product was washed by deionized water for 3 times, and the product was dried for 12 hours in the vacuum oven of 60°C, the organic and inorganic hybrid material PA/DAP was obtained.

The dried sample organic-inorganic hybrid material PA/DAP was fully lapping and then placed in a tubular furnace. Under the mixed atmosphere of 95mL/min nitrogen and 5mL/min hydrogen, the calcined 120min was calcined at 850°C, then cooled to room temperature in the nitrogen atmosphere, and tungsten based composites containing tungsten phosphide and tungsten carbide were obtained.

Tungsten matrix composites containing tungsten phosphide and tungsten carbide are mainly composed of three phases: WP/W₂C/WC, WP/W₂C and WP/W₂C/W. Tungsten based composites containing tungsten phosphide and tungsten carbide contain a large number of heterogeneous interfaces resulting from the existence of tungsten phosphide and other tungsten based materials, therefore the overall electrocatalytic hydrogen evolution performance of tungsten based composites containing tungsten phosphide and tungsten carbide is very competitive. After optimization of structural components, it has the leading electricity.

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