In the dark environment such as rain and other low power efficiency is the bottleneck of solar energy applications, especially in the southern rainy city, solar power has been no small constraints.
In 2017 the National Science and Technology Week and Beijing Science and Technology Week home, Beijing Institute of Nano Energy and Systems Institute of the show 'raindrops thin film power generation' technology, aimed at the pain point, the use of rain to generate electricity.
At the scene, the researchers set up a simple wooden house, laying a raindrops thin film power generation material - nanometer film in the roof of the wooden house, and built a closed circuit, with shower equipment to simulate the rain falling on the film. At this point, the LED connected to the film lights up. If you put a solar panel under the raindrops, you can generate electricity on sunny or rainy days.
'Raindrop power generation using the world's leading polymer nano-thin film rainwater power generation technology, nano-film made transparent, the light transmission rate can reach more than 90%, will be laid on the solar panels, you can become raindrops when raining , Sunny solar power of the composite energy. 'May 20, at the scene, the Chinese Academy of Sciences Beijing Institute of Nano Energy and Systems Wang Zhonglin to the public.
'The film is divided into two layers, the rain drops on the film, the two layers of material will have a contact, the surface will be able to pass through the friction charge. Rain is not pure water, is charged, after contact, a layer of film adsorption positive , Another layer of film with a negative, which produced a voltage, and the closed circuit connected to produce a current. 'In the field to explain the researcher Zhao Xuejiao to reporters.
The amount of electricity generated by raindrops is still under further study. According to Wang Zhonglin's paper published in 'Nature', through the theoretical calculation, another kind of water wave energy generating device with friction and electricity as the technical principle, a large film area in Shandong province can meet the current global power supply demand, but from theory to In practice, there is still a long way to go.
The stability of raindrops is actually related to whether the rainfall continues. If the rain continues to fall, the current continues; if the rain is intermittent, then the pulse is generated, it is difficult to stable life. Therefore, the research team for the friction and instability of the situation, specifically the study of the corresponding circuit - the first electrical collection to a capacitor, and then lead to the formation of DC voltage regulator, the energy conversion rate of up to 85%.
According to the Institute of Chinese Academy of Sciences envisaged, raindrops and water wave power generation may be 5 years to industrialization, so that some equipment to achieve self-energy. To weather stations, for example, in some of the more rainy forest areas or remote areas to set up weather stations, power, maintenance is not very convenient, if the rain droplets thin film power supply stability, is a good power supply options.
'The key is to improve power and stability, as well as how to encapsulate materials more effective.' Zhao Xuejiao introduced. At present, the power of raindrops is still different from that of solar energy, and if it can further improve the power, the current application of solar energy, raindrops can be used. The combination of the two ways will be higher efficiency.
