The stainless steel used for bipolar plate will be passivated in the weak acidic working environment of PEMFC. The passivation film formed slows down the further corrosion of stainless steel, but also increases the contact resistance between passivation film and carbon paper. The research shows that the carbon-based coating can be used to modify the composition, structure and surface defects of passivation film and form a compact passivation film with high corrosion resistance. And enhance the conductivity and thermal conductivity.

Tungsten oxide is an important transition metal oxide semiconductor with excellent electrochromic, photochromic and field emission properties. It has important application prospects in the fields of solar energy utilization, intelligent display, visible light photocatalysis, chemical sensing and so on.

Potassium phosphotungstate (K₃PW₁₂O₄₀) is a kind of Heteropoly acid. Potassium phosphotungstate, as a cathode active material in the molecular cluster of Heteropoly acid, has attracted much attention due to its reversible multi-electron redox reaction, which enables it to achieve a high specific capacity of 260 Ah/kg (ordinary Li₂CoO₂ lithium ion battery is 150 Ah/kg) and fast charge-discharge performance.

With the development of modern science and technology, higher requirements are put forward for the preparation of tungsten, tungsten alloys and tungsten compounds. Tungstate is an important intermediate material in tungsten smelting, and its preparation and technological research have important value and significance.

Photocatalysis can effectively convert light energy into chemical energy. Bi₂WO₆, as a new visible light-responsive photocatalytic material, has a narrow band gap (2.7eV), good photocatalytic activity under ultraviolet and visible light, and can effectively degrade organic pollutants in wastewater.

In the field of industrial production, metal wear is one of the main causes of failure of mechanical parts, such as material conveying systems in metallurgy, coal, power, waterway dredging and other industries, parts wear very seriously. Wear not only causes great loss of materials, but also causes the shutdown of production and affects the normal operation of production line. Therefore, the research and development of high wear resistant materials has been paid attention by material workers.

The thin tungsten sheet used for X-ray shielding material of CT machine is a high precision material with thickness of 0.1-0.2 mm and dimension tolerance of <0.01 mm. At present, the thickness tolerance of ultra-thin and high-precision tungsten sheet used for the collimator shade plate, the core component of CT machine, must reach (+5%) in order to ensure the stability of X-ray signals detected and obtain high-resolution images. How to make the tungsten sheet deform uniformly in hot working, and the surface is easy to handle, without causing surface indentation is the core issue to ensure tolerance. The choice of lubricating materials and methods is very important.

Heteropoly acids are metal oxygen clusters formed by bridging metal atoms with oxygen atoms. Heteropoly acid has good catalytic performance and is an efficient bifunctional catalyst. It has not only acid catalytic performance, but also redox catalytic performance. Heteropoly acid has stable structure and can be used in homogeneous or heterogeneous catalytic environment. It can also be used together with phase transfer catalyst. It has no pollution to the environment and little corrosiveness to equipment. It is a promising green catalyst.

Nickel tungsten oxide has been proved to be able to be used as an anode or ion storage layer in electrochromic devices. Nickel exists in nickel-tungsten oxide thin films in the form of positive bivalent and positive trivalent. Increasing the content of positive trivalent nickel ion is beneficial to improving the discoloration range and ion storage capacity of the thin films, thereby improving the performance of electrochromic devices.

Recently, it was reported that a child in the Xiaolan station of the Guangzhou-Zhuhai intercity had not paid attention to drilling into the security inspection machine. The security personnel who saw this situation immediately stopped after the discovery and directed the child to climb out from the exit.