Flexible plastics that turn mechanical vibrations into electrical energy could spur the development of self-powered sensors and devices
The shrinking dimensions and decreased power consumption of modern electronic gadgets have created opportunities for energy harvesting processes that tap into free, green energy from the environment. Vibration harvesters, for example, produce small amounts of electricity from everyday mechanical disturbances such as wind currents, traffic noise or footsteps.
Now, Kui Yao and co-workers from the A*STAR Institute of Materials Research and Engineering in Singapore have discovered a way to give lightweight polymer vibration harvesters a hundredfold boost in energy output — a finding that may help to eliminate manual battery recharging in microsensors and mobile devices1.
Many vibration harvesters contain piezoelectric substances that create an electric voltage when mechanically bent. By fabricating piezoelectric materials into cantilevers that resemble a diving board, these devices can oscillate from ambient vibrations and generate electricity. Researchers often use piezoelectric ceramics because they impart large amounts of electrical charges; however, the brittleness of ceramics makes them unsuitable for prolonged and large vibrational movements.
Yao and co-workers investigated a plastic-based piezoelectric material, polyvinylidene fluoride (PVDF), which is low cost and readily undergoes mechanical strain. To make efficient vibration harvesters from PVDF, researchers must stack the polymer in multiple layers, improving the output current and reducing the electrical impedance that is inherent to piezoelectric materials. But when too many thin piezoelectric layers are stacked, the cantilever can become too stiff for bending-mode vibrational harvesting.
To optimize piezoelectric harvesting with plastic films, the team deployed an analytical approach. Developing a mathematical model of a multilayered polymer cantilever coated with metal electrodes, the researchers systematically calculated how different material parameters affected the energy output.
Their simulations revealed some often-ignored factors “such as the thinness of electrode coatings and the material’s electrical parameters,” says Yao. “These can have a dramatic effect on the electricity generated by bending multilayer polymers.”
One key parameter identified was the need to match the electrical impedance with an optimum load resistance. The researchers’ analysis showed that the energy output of a 22-layered piezoelectric structure could be from 5 to 400 times higher than a single-layer piezoelectric polymer of similar dimensions.
The team then tested the feasibility of their analytical results by fabricating a PVDF-based vibrational harvester on a flexible aluminum substrate. They used scalable dip-coating procedures to build up polymer multilayers and ensured thin metal electrode coatings with physical vapor deposition techniques.
“Our experimental results are promising and show that, for many practical applications, piezoelectric polymer multilayers may enable harvested energy to replace batteries,” notes Yao.
The Latest on: Energy harvesting
via Google News
The Latest on: Energy harvesting
- The global energy harvesting market is estimated to grow at a CAGR of 10.07% during the forecast period of 2020-2028on February 4, 2020 at 3:58 am
The factors fueling the market growth are technological advancements in manufacturing industries, the development of smart cities leading to the growth of sensors, and IoT implementation for building ...
- Concurrent tracking of strain and noise bursts at ferroelastic phase frontson February 4, 2020 at 3:00 am
Many technological applications are based on functional materials that exhibit reversible first-order ferroelastic transitions, including elastocaloric refrigeration, energy harvesting, and sensing ...
- Global Energy Harvesting System for Wireless Sensor Network Market 2020: with New Principle and Updated Strategies 2025on February 4, 2020 at 2:50 am
Avail a detailed research offering a comprehensive analysis of the developments, growth outlook, driving factors, and key players of the Energy Harvesting System for Wireless Sensor Network market in ...
- Nanoscale material discovery for thermoelectric energy harvesting and coolingon January 30, 2020 at 5:52 am
https://warwick.ac.uk/fac/sci/hetsys/projects/2020/ This project aims to exploit electronic and vibrational properties of nanoscale materials that are 1000 times smaller than diameter of a human hair ...
- Ambient Energy Harvester Market Review From 2020 To 2029 | Application, Trends, End Useron January 30, 2020 at 1:03 am
MarketResearch.Biz has brought concise research on Global Ambient Energy Harvester Market which depicts precious insights related to huge market trends using the enterprise. The report throws mild at ...
- Can advancements in 4G/5G communications combined with strides in energy efficiency in smart devices accelerate the IoT revolution?on January 29, 2020 at 2:45 pm
Doing What You Can With What You Have Energy harvesting is now being widely studied as the best viable method through which to provide power for ultra-low-power IoT applications. It takes advantage of ...
- Getting Started with Energy Harvestingon January 20, 2020 at 1:33 pm
Energy Harvesting is a possible solution, but where should we start? Download a guide here detailing what you need to know about Energy Harvesting, and getting started with incorporating it in your ...
- Energy Harvesting Market Showing Impressive Growth With Arveni, Convergence Wireless, Cymbet Corporation, EnOcean and Honeywell Internationalon January 15, 2020 at 7:41 am
According to a new report published by the Insight Partners titled “Global Energy Harvesting Market to 2027" is a specialized and in-depth study of the Energy Harvesting industry with a special ...
- Energy Harvesting Systems Market 2020 Technology Advancements and Industry Demandon January 14, 2020 at 7:38 am
Technological advancement in wireless sensors and portable electronics in association to enhanced reliability will further drive the Piezoelectric energy harvesting systems market. Furthermore ...
- Energy Harvesting System for Wireless Sensor Network Global Market Is Expected To Grow With A CAGR Of 4.1% In Forecast Period 2020-2026on January 7, 2020 at 11:19 pm
A new market study, titled "Discover Global Energy Harvesting System for Wireless Sensor Network Market By Upcoming Trends, Growth Drivers and Challenges" has been featured on WiseGuyReports.
via Bing News