Korean researchers have developed a groundbreaking energy harvesting device that converts body movements into electricity.
Researchers at the Daegu Gyeongbuk Institute of Science and Technology in South Korea have developed a highly efficient energy harvesting device that converts body movements into electrical energy. Notably, the new device exhibits an energy conversion efficiency 280 times greater than that of conventional stretchable piezoelectric energy harvesters.
The device utilizes the piezoelectric effect, a phenomenon where certain materials generate an electrical charge in response to mechanical stress. This means that activities like walking, bending, or even subtle movements can be harnessed to produce electricity. The piezoelectric materials possess an inherent asymmetry in their charge distribution. When subjected to mechanical stress, such as bending or stretching, this asymmetry is further amplified, leading to a separation of charges and the generation of an electrical potential across the material.While the concept of piezoelectric energy harvesting is not new, its application in wearable devices has been hindered by limitations in material properties and device design. “In the early stages of PENG research, cantilever-shaped inorganic piezoelectric devices were extensively studied, enabling efficient energy harvesting from high-frequency vibration,” said the study led by Professor Jang Kyung-In. “However, these conventional designs are limited when they are applied to flexible and stretchable formats.” Many materials with strong piezoelectric responses, such as lead zirconate titanate , are inherently rigid and brittle.The DGIST research team overcame this obstacle through innovative material engineering. They devised a unique three-dimensional structure that allows the use of PZT while maintaining a high degree of flexibility and stretchability. “Structures such as 3D buckling have been widely used to impart stretchability to devices,” remarked the study.Furthermore, the researchers introduced a novel electrode design. This design, referred to as a “curvature-specific coupling electrode,” ensures efficient energy capture by preventing the cancellation of“This design circumvents the typical cancellation of electrical output observed in conventional systems, ensuring that each segment of the nanogenerator effectively contributes to overall energy production,” Such devices could potentially eliminate the need for frequent battery charging or replacement in a wide range of applications, including smartwatches, fitness trackers, and medical sensors. This research represents a major step forward in the field of wearable technology. The DGIST team’s innovative approach to material design and electrode configuration has yielded a device with the potential to transform how we power our wearable devices. Further research and development will focus on optimizing this technology for commercial applications and exploring its full potential in various wearable electronic devices.An active and versatile journalist and news editor. He has covered regular and breaking news for several leading publications and news media, including The Hindu, Economic Times, Tomorrow Makers, and many more. Aman holds expertise in politics, travel, and tech news, especially in AI, advanced algorithms, and blockchain, with a strong curiosity about all things that fall under science and tech.
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