Preparation Of Tungsten - Based Semiconductor Nanomaterials And Study On Electrocatalytic Hydrogen Evolution

Tungsten-based semiconductor materials are considered to be promising candidates as photocatalytic production of oxygen, due to its excellent photo catalysis and electric catalytic properties, and have been applied to various areas including electricity hydrogen evolution（HER）, oxygen reduction, battery, supercapacitor and many other areas. WO3 has been identified as a promising candidate electrocatalyst, as the consequence that it can form tungsten bronze（HxWO3） conductor with highly electron and proton. Electric-catalytic activity can be affected by crystal phase structure, oxygen vacancy and surface state, thus, the electrocatalytic activities for HER of WO3 material can be promoted by suitably adjusting the preparation conditions and designing the structure of WO3-based materials. On basis of the above consideration, tungsten oxides with low valence were fabricated, then vulcanized to form WS2 sheet and load other compounds, in order to increasing the roughness of surface active sites, and improve the performance of the catalytic activity of hydrogen evolution.The specific contents are as follows:1. WO3-x with different crystal phases were synthesized through one-step using solvothermal method,using WCl6 as the source of tungsten, salicylic acid as organic inducer. Different morphology, crystal phase was obtained by adjusting the ratio mixed volume of alcohol and water. Explored as the catalyst for electricity hydrogen evolution, the composites exhibited desired performance for electricity hydrogen evolution.2. Using the as-prepared WO2.72 as precursor, WS2 sheets were strip with the help of sulfur powder. Then WS2/ZnFe₂O₄ composites were fabricated using sol-gel method, by regulating different concentration ratio, using ferric nitrate as the source of iron, zinc nitrate as the source of zinc, amd finally calcine to form the composite. Its performance as the catalyst of hydrogen evolution reaction were explored.3. First, WS2/Co3O4 composites were synthesized using the as-prepared WS2 as substrate, cobalt nitric as cobalt source, through the treatment of ethylenediamine（EN） alkaline. Then, the composite were phosphated to form WS2/CoP. A series of characterization were taken, and moreover, the Catalytic performance of hydrogen evolution reaction were studied.