Hosted by IDTechEx
Off Grid Energy Independence
Posted on February 19, 2014 by

Nanogenerator for acoustic energy harvesting

As a vastly available energy source in our daily life, acoustic vibrations are usually taken as noise pollution with little use as a power source. Now scientists from the Georgia Institute of Technology, Chongqing University and Beijing Institute of Nanoenergy and Nanosystems we have developed a triboelectrification-based thin-film nanogenerator for harvesting acoustic energy from ambient environments.
Structured using a polytetrafluoroethylene thin film and a holey aluminum film electrode under carefully designed straining conditions, the nanogenerator is capable of converting acoustic energy into electric energy via triboelectric transduction. With an acoustic sensitivity of 9.54 V Pa-1 in a pressure range from 70 to 110 dB and a directivity angle of 52°, the nanogenerator produced a maximum electric power density of 60.2 mW m-2, which directly lit 17 commercial light-emitting diodes (LEDs).
Furthermore, the nanogenerator can also act as a self-powered active sensor for automatically detecting the location of an acoustic source with an error less than 7 cm. In addition, an array of devices with varying resonance frequencies was employed to widen the overall bandwidth from 10 to 1700 Hz, so that the nanogenerator was used as a superior self-powered microphone for sound recording. This approach presents an adaptable, mobile, and cost-effective technology for harvesting acoustic energy from ambient environment, with applications in infrastructure monitoring, sensor networks, military surveillance, and environmental noise reduction.
Learn more at the next leading event on the topic: Business and Technology Insight Forums - Tokyo, September 2019 External Link on 18 - 19 Sep 2019 at Tokyo, Japan hosted by IDTechEx.
More IDTechEx Journals