Chinese researchers hit 200 watts per square meter harvesting energy from falling raindrops

Alternative forms of energy are essential for the world to achieve its long-awaited green future. With the quest to reduce the use of polluting fuels and non-renewable energy sources, alternative sources have been gaining attention and investment from companies. Through these investments, several advances have been made that have enabled the transformation of unimaginable resources into energy sources. China recently announced the development of equipment capable of transforming rain into energy, building on an established field of research into triboelectric nanogenerators.

Using rain to produce energy

According to some sources, the falling motion of raindrops is capable of producing a small amount of energy that can be converted into electricity. Although this is a small amount, when combined with other resources, it can become substantial. For researchers, this demonstrates that rain can be a renewable form of energy.

Recently, a group of Chinese researchers revealed the development of equipment capable of performing this action. However, the difficulty in reproducing the structure’s development process makes its cost high when compared to its limited application.

Understanding what a triboelectric nanogenerator is

The device developed by the researchers was called a triboelectric nanogenerator (TENG). To generate energy, it uses a type of liquid-solid electrification. The same technology can be used to extract energy from ocean waves. Based on this study, self-sustaining environments can be improved, expanding the capacity to produce energy in artificial ecosystems. However, installation can be challenging.

A detailed study was recently published by the scientists involved in the project. According to Professor Zong Li, one of the researchers responsible for the study:

“Although D-TENGs have ultra-high instantaneous output power, it is still difficult for a single D-TENG to continuously supply power for megawatt-level electrical equipment. Therefore, it is very important to realize the simultaneous utilization of multiple D-TENGs”.

According to the professor, it is also possible to connect a series of D-TENG devices. When raindrops fall on the surface of the panel, a process called triboelectrification begins, which produces and stores the energy extracted from the rain. This surface, called FEP, which is charged with a negative charge, causes the drops to be positively charged. “The amount of charge generated by each droplet is small, and the surface charge on the FEP will gradually dissipate. After a long time on the surface, the charges on the FEP surface will gradually accumulate to saturation.”

To keep the panels fully operational, it is necessary to use a bridge array generator, which uses the array’s lower electrodes to reduce the capacity losses that were recorded when more than one panel was installed nearby. The efficiency of this system was tested by comparing its effectiveness with that of the array bridge alone.

“The peak power output of the bridge array generators is nearly 5 times higher than that of the conventional large-area raindrop energy with the same size, reaching 200 watts per square meter, which fully shows its advantages in large-area raindrop energy harvesting. The results of this study will provide a feasible scheme for large-area raindrop energy harvesting,” said Li.

The sustainable energy source of the future?

Despite the significant results obtained by Zong Li and his team, it is still not possible to say what the real impact of this form of sustainable energy will be. Therefore, further research is still needed to understand the effects and impacts of this technology. At the same time, significant advances have been made in the field of solar energy. Recently, a floating solar power plant has been attracting attention on social media. The images, which were shared, showed how it was possible to combine a visually appealing design with high energy production.