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Electrocatalyst based on nano niobium dioxide for nitrogen reduction

Ammonia is the largest chemical product produced on earth, with an annual production of more than 150 million tons, and has been synthesized by the Haber-Bosch process for more than 100 years. However, the Haber-Bosch process uses hydrogen derived from natural gas reforming to reduce nitrogen under high temperature and pressure, so it is a process with high energy consumption and CO2 emission. However, the electrochemical nitrogen reduction reaction (NRR), which directly uses water and nitrogen as raw materials [...]

Preparation and synthesis of cesium carbonate

Cesium carbonate is an inorganic compound. White solid at room temperature and pressure. It is soluble in water and absorbs moisture quickly when exposed to air. Cesium carbonate aqueous solution is strongly alkaline and can react with acid to form the corresponding cesium salt and water, and release carbon dioxide. Cesium carbonate should be sealed, dried and kept separate from acid during storage. Preparation and synthesis: 1. Prepare sulfuric acid solution of cesium salt, add aluminum sulfate to it, and precipitate [...]

Why is silicon nitride ceramic substrate a world-class strategic product?

It is well known that the heat generated by the semiconductor devices work is the key factor that causes for the failure of semiconductor devices, and the thermal conductivity of the insulating substrate is the key to affect the whole semiconductor cooling device, in addition, due to the often face the complex mechanics environment such as turbulence, vibration, substrate material also need certain mechanical reliability, silicon nitride ceramic various aspects performance is balanced, It is a structural ceramic material [...]

Preparation method of nano-sized silicon carbide

2.1 Morphology memory synthesis method The main meaning is that the macrostructure of the initial solid reactants can be maintained to a certain extent before and after the synthesis reaction. In 1988, French Ledoux and his colleagues first proposed and used this method to prepare silicon carbide with high specific surface area and SiC materials with different structures. Later, people use this method to prepare silicon carbide nanowires, nanotubes, nano spheres and high specific surface silicon carbide. 2.2 Sol-gel and carbothermal [...]

Preparation of zirconium carbide nanomaterials from waste plastics

Zirconium carbide, as an ultra-high temperature ceramic material, has excellent physical and chemical properties, such as high hardness, high melting point, high wear resistance, low vapor pressure, low resistivity, good chemical stability and thermal stability. At present, The method of preparation of zirconium carbide is mainly with zirconium dioxide reaction with carbon reduction synthesis (J.M ater. Sci., 2004,39,6057-6066.), sol-gel (j. ur. Ceram. Soc., 2007,27,2061-2067.) and chemical vapor deposition (Appl. Surf. Sci., 2015332591-598, Surf. Coat. Technol., 2008203,87-90.) method. Industrial preparation [...]

The magical use of nano silicon carbide

Cubic silicon carbide, also known as β-SiC, belongs to the cubic crystal system (diamond crystal type), relative to the common silicon carbide powder α-SiC (black silicon carbide and green silicon carbide) has a unique advantage. Research shows that beta SiC powder with wear-resistant, high temperature resistant, heat resistant, corrosion resistance, radiation resistance, good conductive properties such as good performance, can be widely used in the high-grade refractory materials, special ceramics materials, grinding materials and advanced and reinforced material, and other [...]

Nanometer magnesium hydroxide for nanoscale materials

Nano magnesium hydroxide can also be used to save fertilizer? Recently in zhengzhou held a “nanometer magnesium hydroxide fertilizer application technology” scientific and technological achievements appraisal meeting, nanometer magnesium hydroxide fertilizer synergist recognized by experts, experts agree that the technology has obvious economic benefits and social benefits. By zhao yufen academician, director of the national committee of xiamen university, south China agricultural university professor liao and henan academy of agricultural science and technology ke-gang sun researcher, deputy director of the [...]

Application and prospect of boron nitride nanomaterials

The purpose of preparation and characterization of boron nitride nanomaterials is to improve the properties of traditional boron nitride materials, give full play to their various effects at the nanoscale level, achieve expected excellent properties and expand new application fields. 1, boron nitride coating has obvious chemical inertia at high temperature, so that boron nitride coating can be used to protect aluminum, magnesium, zinc alloy and other materials from high temperature oxidation. When coated with refractory or ceramic ware, [...]

Hafnium carbide ceramic material additive

At present, the method of synthesis of hafnium carbide at home and abroad is not much reported, the original method, generally need to be above 1900℃ to react, high energy consumption, high requirements for equipment, and grow out of the particle size, need to use other methods to reduce the reaction temperature. (2) Liquid phase precursor conversion method. Wang Yanbin et al. used HfoCl2, HCl, HNO3, n-propanol, isopropanol, ethanol, acetyl and other HFC powders with sizes ranging from tens [...]

Application of praseodymium fluoride

Praseodymium metal (PR) material is one of the products of light rare earth metals. Because of its unique physical and chemical properties, it has been widely used in the fields of rare earth permanent magnets, hydrogen storage materials, non-ferrous metals and alloys, ignition alloys, steel and iron, and has a promising prospect. In the middle of the 1950s, China began to develop metal praseodymium. In the 1960s, the metal gradually went into industrial production, and a small quantity of [...]