The reporter recently learned from the City University of Hong Kong that the research team led by the school ’s scholars has successfully developed a new type of droplet generator. The droplet generator is provided with a transistor-like structure, so that its instantaneous power density is increased thousands of times compared with the current similar droplet generator, and the efficiency of electric energy conversion is greatly improved. This result was published in the latest issue of Nature.
It is understood that the traditional droplet generator generates electricity based on the friction and electrostatic induction when the droplet hits the surface, but due to the limitation of the amount of surface friction charge, this method has a low power conversion efficiency. The two key findings of the above research team overcome this problem.
The team member and Professor Wang Zuankai of the City University of Hong Kong introduced the two key findings. One is the surface static charge generated when water droplets continue to hit the permanently charged polytetrafluoroethylene (PTFE) material, which can be charged for a long time. Will continue to accumulate to saturation level. The second is that they have developed a unique structure similar to field effect transistors. The structure is composed of an aluminum electrode and an indium tin oxide (ITO) electrode with a PTFE film on the surface. When the water droplet hits the PTFE / ITO surface and spreads on the surface, because the water is conductive, it will "connect" the path between the aluminum electrode and the PTFE / ITO two electrodes and become a complete circuit that can be energized. Based on this design, continuous water droplets accumulate high-density surface static charge on PTFE. At the same time, whenever the water drop connects the two electrodes, all the electric charge accumulated on the PTFE is discharged, generating a current. Therefore, both instantaneous power density and electrical energy conversion efficiency are greatly improved.
"Our research shows that a drop of 100 microliters drops from a height of 15 centimeters, which can generate a voltage of more than 140 volts. The power generated by the generator is enough to light 100 small LED lights." Wang Zuankai said that the research results It can help the world to develop more water resources. In the future, it can be promoted and installed on surfaces where different liquids and solids contact, such as ship hulls, coasts, and even umbrella surfaces, to make full use of low-frequency water kinetic energy. (Reporter Zhang Qiang)
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