Photoelectrocatalytic water decomposition using semiconductor is a very attractive technique to solve the global energy and environmental problems. This technique converts the solar energy into hydrogen energy by water decomposition. Photoelectrode is an important part of this technique. Graphene-modified semiconductor photoelectrode is an excellent photoelectrode of within.

The solar photoelectrochemical (PEC) cell for hydrogen production is a technique based on solar energy and water. The products are hydrogen and oxygen. Both products are renewable. Thus, this technique has no harm to the environment, and can be applied on a small-scale production and mass production. Therefore, this technology is the most attractive hydrogen production direct use the solar energy

Silver-nickel contacts are widely used in various low-voltage electrical appliances due to their good thermal conductivity, low and stable contact resistance, and excellent processing properties. However, due to the weak anti-welding performance, the applications of silver-nickel contacts are limited.

In the 21st century, energy and environmental pollution have become a worldwide problem. The development and application of new energy sources is imminent. Lithium-ion batteries have advantages such as high operating voltage and high specific energy, and have been applied to portable electronic products such as laptops, mobile phones and digital cameras. In recent years, the rapid development of full electric vehicles and hybrid electric vehicles has provided a huge market prospect and high-speed development for lithium-ion batteries. It also poses new challenges for performance improvement and cost reduction of lithium-ion batteries.

At present, China's major cities are booming in the construction of rail transit projects. Due to the great advantages, the shield tunneling method has been widely used in the construction of rail transit tunnels.

Tungsten disulfide (WS2) is a hard\dry lubricant with characteristics similar to graphite. It has excellent high temperature resistance and extreme pressure resistance. It has good attach to metal surfaces and low thermal conductivity. WS2 was first applied to the lubrication of key parts of the Mariner project’s spacecraft. What’s more, it was used to prepare high temperature resistant grease and engine oil.

Tungsten disulfide (WS2) is a hard\dry lubricant with characteristics similar to graphite. It has excellent high temperature resistance and extreme pressure resistance. It has good attach to metal surfaces and low thermal conductivity. WS2 was first applied to the lubrication of key parts of the Mariner project’s spacecraft. What’s more, it was used to prepare high temperature resistant grease and engine oil.

The fifth-generation jet fighter is the most advanced generation of fighters in the world. It is fully maneuvered with low detectability technology and has high maneuverability, advanced avionics system, highly integrated computer network, excellent battlefield situational awareness and information fusion capabilities.The fifth-generation fighters currently in service are only the US F-22, F-35, Russia's T-57 and China's Chengdu J-20.