The application analysis of metallic nickel and their oxides

Nickel is closed to silver color, element symbol is Ni, is a hard and malleable and has ferromagnetic property metal element. It can be highly polished and resist corrosion, and has good mechanical strength and ductility, refractory, thermostability, and have high chemical stability, can not be oxidized in the air and other features, it is a very important rare metal materials used to manufacture steel.

According to metal powder supplier, nickel deposits can be divided into sulphide deposits and laterite deposits, mining sulphide deposits cost low and have many by-products, by-products including copper, iron, chromium, cobalt, manganese, gold, silver, etc., so in the past 50 years, global nickel production have a large proportion is refining from the sulphide deposit. The top three global nickel ore reserves countries are Australia, Russia, New Caledonia and other countries, the total output of these three countries was over half of global output. In the part of refining nickel, Japan is rather special, because Japan is not a nickel-mining country, but because of special steel products with high demand, so it imports a lot of nickel ore to refine, Japan's refining production accounts for about 13%, only inferior to Russia.

The use of nickel is in stainless steel, special steel, plate, magnetic materials, non-ferrous alloy, batteries, catalysts, etc., mainly used in petrochemical plants, automotive, industrial equipment, household appliances, electronic equipment, communications equipment and petroleum refining. The nickel demand divided into low-purity nickel, ferronickel, nickel oxide, nickel powder fields. Among them, the largest use of nickel is in making stainless steel, accounting for about 65% of the total consumption.

The application field of nanometer NiO is broad, the following will mainly describe its relatively extensive applied research in several areas: due to the nano nickel oxide having a large specific surface area, in many transition metal oxide, nickel oxide catalyst has good catalytic properties, and when the nickel oxide nanoparticles combined with other materials, its catalytic role can be further strengthened. It was used with a regular hollow silica skeleton wrapped NiO composites research nickel oxide catalytic and oxidized organic amine obtain better results. Because of this nano-nickel oxide particles with the features of high specific surface area and silica surface rich pores, so the contact area of the catalytic reaction and diffusion efficiency have been significantly strengthened.

Inexpensive metal oxides such as NiO, Co3O4 and MnO2 can replace other precious metal oxides such as RuO2 as electrode material supercapacitors, of which nickel oxide preparation method is simple, inexpensive, so attach public attention. Preparation of Nano-nickel oxide electrode capacitance can often reach 300F/g or so, the number of cycles up to 500 to 1000 times.

Due to NiO in the optical absorption spectra showed selective light absorption, this material in optical switches, optical computing, optical signal processing and other fields have their application value. Studies used porous anodic aluminum oxide as template prepared about length 60¼m, outer diameter about 200nm nickel oxide nanotubes, the light absorption bandwidth narrower than the pure large crystals nickel oxide, thereby exhibiting a better selective light absorption characteristic.

Since NiO is a semiconductor material, use gas adsorption make the conductivity vary can be manufacturing gas resistance. It was developed to use nano-composite nickel oxide thin film making sensors, it can monitor the indoor toxic gases - formaldehyde. It was also have someone used nickel oxide thin films prepared gas sensor which at room temperature can operate H2. NiO in the optical, electrical, magnetic, catalytic, biological and other fields will also be further developed.

Source:http://www.mhcmp.com