Heteropolyacids have been developed for more than 100 years, and the research contents have been gradually extended to material chemistry, electrochemistry, catalytic chemistry, photochemistry, surface science, medicine and other fields. Therefore, heteropolyacids show high catalytic activity and selectivity for various organic reactions.

Silver nickel electrical contact has been widely used in various low-voltage electrical appliances because of its good thermal conductivity, low and stable contact resistance, excellent processing performance and other advantages. However, due to its poor anti fusion welding performance, the application range of silver nickel electrical contact is affected.

In architecture, through glass doors and windows is the main source of energy loss. In China, the energy loss through glass doors and windows can be as high as 40% - 50% of the total building energy consumption. At the same time, especially in today's society, the large-scale use of glass wall aggravates the loss of building energy consumption.

Cathode materials have been the bottleneck to improve the performance and reduce the cost of lithium-ion batteries. Lithium iron phosphate is the first choice of cathode materials for modern commercial lithium-ion batteries because of its low price, high energy density, long life and good safety. However, the low electronic conductivity of lithium iron phosphate seriously hinders its application in the field of power and energy storage batteries.