2results about How to "Reduce crystal defects" patented technology

This invention discloses a zirconium alloy cladding composite protective coating and its preparation method, comprising a first Mo layer, a second Mo layer, and a Cr layer arranged sequentially from bottom to top. The thickness ratio of the Cr layer to the second Mo layer is (3-7):1, and the thickness ratio of the first Mo layer to the second Mo layer is (2-5):1. The morphology of the first Mo layer is nanocrystalline, and the morphology of the second Mo layer is columnar crystal. Compared with the prior art, the zirconium alloy cladding composite protective coating provided by this invention has a three-layer structure. The first Mo layer enhances the coating density, the second Mo layer is responsible for achieving strong bonding with the Cr coating, the Cr coating is responsible for achieving resistance to high-temperature water vapor corrosion and reducing the oxidation weight gain of the zirconium alloy, the first Mo layer can provide more nucleation sites, promote dense deposition of the coating, and FCC is a tightly packed lattice with a higher filling rate than BCC, resulting in better corrosion resistance.

The application relates to the field of photocatalytic hydrogen evolution and relates to a preparation method and application of a copper-phosphotungstic acid hybrid functional material. The application aims to solve the problems of existing polyacid materials, such as easy recombination of photo-generated electron holes, insufficient photocatalytic hydrogen evolution activity and high cost of photocatalysts. The patent designs and develops a copper-phosphotungstic acid hybrid functional material, and the method comprises the following steps: taking phosphotungstic acid, copper chloride and 5-(2-pyridyl)tetrazole as raw materials, dissolving, adjusting pH, carrying out hydrothermal reaction and stepwise temperature reduction treatment, and obtaining blue-green rectangular block-shaped crystals. When the material is used in a water / acetone (1 / 2) solution and a 500 W xenon lamp light irradiation condition and triethanolamine is used as a sacrificial agent, the photocatalytic hydrogen evolution rate can reach 3983 mu mol g-1 h-1, the three-dimensional hybrid structure has excellent charge separation efficiency and stability, and the application demand of photocatalytic hydrogen evolution can be met.