Featured Research

from universities, journals, and other organizations

Less is more in piezoelectric energy harvesting: Piezoelectric materials convert electrical energy into strain, or vice versa

Date:
March 2, 2012
Source:
National Physical Laboratory
Summary:
Piezoelectric materials convert electrical energy into strain, or vice versa. These materials are used to harvest energy from everyday mechanical vibrations -- such as an air conditioning unit rattling, or a footbridge vibrating as pedestrians walk across it.

Footbridge. Piezoelectric materials can harvest energy from vibrations, such as the slight movement of a footbridge as pedestrians walk across it.
Credit: Bojan Stepancic / Fotolia

Piezoelectric materials convert electrical energy into strain, or vice versa.

Related Articles


These materials are used to harvest energy from everyday mechanical vibrations -- such as an air conditioning unit rattling, or a footbridge vibrating as pedestrians walk across it.

Generally power levels are low, but the environmental benefit of the technology is to replace batteries, and the associated costs of replacement, rather than saving energy per se. For example, researchers are looking to use the technology to power implanted medical devices, where the cost of the operation far outweighs the battery costs.

Piezoelectric energy harvesters are usually vibrating cantilevers covered with a layer of piezoelectric material. The piezoelectric material converts the mechanical strain (e.g. vibrations) into a charge that can power an electrical device. Typically the entire length of the cantilever is covered with piezoelectric material as you would imagine that this would harvest the most energy.

However, NPL scientists have found that, surprisingly, reducing the amount of piezoelectric material covering the cantilever increases the power output. To get the most energy out you only need to cover the cantilever for two thirds of its length.

NPL is working on this European Metrology Research Programme project with seven other national measurement institutes.


Story Source:

The above story is based on materials provided by National Physical Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mark Stewart, Paul M. Weaver, Markys Cain. Charge redistribution in piezoelectric energy harvesters. Applied Physics Letters, 2012; 100 (7): 073901 DOI: 10.1063/1.3685701

Cite This Page:

National Physical Laboratory. "Less is more in piezoelectric energy harvesting: Piezoelectric materials convert electrical energy into strain, or vice versa." ScienceDaily. ScienceDaily, 2 March 2012. <www.sciencedaily.com/releases/2012/03/120302101815.htm>.
National Physical Laboratory. (2012, March 2). Less is more in piezoelectric energy harvesting: Piezoelectric materials convert electrical energy into strain, or vice versa. ScienceDaily. Retrieved February 28, 2015 from www.sciencedaily.com/releases/2012/03/120302101815.htm
National Physical Laboratory. "Less is more in piezoelectric energy harvesting: Piezoelectric materials convert electrical energy into strain, or vice versa." ScienceDaily. www.sciencedaily.com/releases/2012/03/120302101815.htm (accessed February 28, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Saturday, February 28, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Elon Musk's Hyperloop Moves Forward

Elon Musk's Hyperloop Moves Forward

Buzz60 (Feb. 27, 2015) Zipping around at 800-miles an hour is coming closer to reality in California. An entire town is being built around Elon Musk&apos;s Hyperloop concept and it wants you to stop in for a ride when it&apos;s ready. Brett Larson is on board. Video provided by Buzz60
Powered by NewsLook.com
Vibrating Bicycle Senses Traffic

Vibrating Bicycle Senses Traffic

Reuters - Innovations Video Online (Feb. 26, 2015) Dutch scientists have developed a smart bicycle that uses sensors, wireless technology and video to warn riders of traffic dangers. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
In Japan, Robot Dogs Are for Life -- And Death

In Japan, Robot Dogs Are for Life -- And Death

AFP (Feb. 25, 2015) Robot dogs are the perfect pet for some in Japan who go to repairmen-turned-vets when their pooch breaks down - while a full Buddhist funeral ceremony awaits those who don&apos;t make it. Duration: 02:40 Video provided by AFP
Powered by NewsLook.com
London Show Dissects History of Forensic Science

London Show Dissects History of Forensic Science

AFP (Feb. 25, 2015) Forensic science, which has fascinated generations with its unravelling of gruesome crime mysteries, is being put under the microscope in an exhibition of real criminal investigations in London. Duration: 00:53 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins