New Low-Cost Technology ups the Game of Energy-Harvesting Nanogenerators

In a new study, scientists develop an efficient way of harvesting electrical energy through surface contact.

Finding sustainable, yet efficient, energy-generating sources has been the focus of scientists around the globe. A team of researchers at Chung-Ang University, Korea, has now developed a new type of technology for converting static electricity into electrical energy. This technology offers several advantages over existing ones, in addition to being energy-efficient and environment-friendly, creating hope for a more sustainable society.

Have you ever wondered why pieces of Styrofoam get stuck to a cat’s fur? Or why some clothes, when rubbed together, sometimes cling to each other? This happens because some materials, when in contact, develop an electric charge, known as static electricity. Always on the lookout for newer energy sources, scientists often wondered whether this “contact electricity” could be converted to useful electrical energy. This was made possible with the invention of the triboelectric nanogenerator (TENG) in 2012, a device that could generate energy via mechanical contact between surfaces. Because this device primarily works on the concept of surface contact, it is a sustainable, green source of power. But, TENG comes with its cons. The current technology used in TENGs is not very efficient, as it sometimes leads to possible leakage of electricity in air (in other words, “electric breakdown”), which ultimately reduces the power output. Another pragmatic problem is the low voltage supplied by the TENG when operating devices with low resistance, such as LEDs.

Regardless, having realized the potential of TENGs, scientists globally have been working on upgrading its technology. Now, in a breakthrough study published in Advanced Energy Materials, a group of scientists from Korea, led by Dr Sangmin Lee from Chung-Ang University, found a new way to tackle the issues faced by conventional TENGs. They used a technique called “ion enhanced field emission” to devise a new type of TENG, which they named as IEFE-TENG. Interestingly, the device managed to generate a larger electrical output than conventional TENGs. Talking about the scope of this exciting finding, Dr Lee says, “Many studies have tried to generate electricity through static electricity, but conventional triboelectric nanogenerators pose several challenges, which have remained the same since they were first introduced. Our lab believed that through structural improvements, we could further improve the electrical performance and applicability of triboelectric generators.”

In a new study, scientists develop an efficient way of harvesting electrical energy through surface contact. This technology offers several advantages over existing ones, especially for portable gaming devices, sensors, etc.


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