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features

Research: Collect wind power as you move

Researchers in China have designed a tiny device that can scavenge wind energy from the breeze you make when you walk or run

Published in Fit Tech 2021 issue 1

Most of the wind available on land is too gentle to push commercial wind turbine blades, but now researchers in China have designed a kind of “tiny wind turbine” that can scavenge wind energy from breezes as little as those created by a brisk walk. The method, presented in the journal Cell Reports Physical Science, is a low-cost and efficient way of collecting light breezes as a micro-energy source.

The new device is not technically a turbine. It is a nanogenerator made of two plastic strips in a tube that flutter or clap together when there is airflow. Like rubbing a balloon to your hair, the two plastics become electrically charged after being separated from contact, a phenomenon called the triboelectric effect. But instead of making your hair stand up like Einstein’s, the electricity generated by the two plastic strips is captured and stored.

“You can collect all the breeze in your everyday life,” says senior author Ya Yang of Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences. “We once placed our nanogenerator on a person’s arm, and a swinging arm’s airflow was enough to generate power.”

Allows sweat to evaporate
A breeze as gentle as 1.6 m/s (3.6 mph) was enough to power the triboelectric nanogenerator designed by Yang and his colleagues. The nanogenerator performs at its best when wind velocity is between 4 to 8 m/s (8.9 to 17.9 mph), a speed that allows the two plastic strips to flutter in sync. The device also has a high wind-to-energy conversion efficiency of 3.23 per cent, a value that exceeds previously reported performances on wind energy scavenging. Currently, the research team’s device can power up 100 LED lights and temperature sensors.

“Our intention isn’t to replace existing wind power generation technology. Our goal is to solve the issues that the traditional wind turbines can’t solve,” says Yang. “Unlike wind turbines that use coils and magnets, where the costs are fixed, we can pick and choose low-cost materials for our device. Our device can also be safely applied to nature reserves or cities because it doesn’t have the rotating structures.”

Big goal, small device
In the past, Yang and his colleagues have designed a nanogenerator as small as a coin, but he wants to make it even tinier and more compact with higher efficiency. In the future, Yang and his colleagues would like to combine the device to small electronic devices such as phones, to provide sustainable electric power.

• For more research using triboelectric nanogenerator technology, see Fit Tech Issue 2 2020: Create your own energy

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features

Research: Collect wind power as you move

Researchers in China have designed a tiny device that can scavenge wind energy from the breeze you make when you walk or run

Published in Fit Tech 2021 issue 1

Most of the wind available on land is too gentle to push commercial wind turbine blades, but now researchers in China have designed a kind of “tiny wind turbine” that can scavenge wind energy from breezes as little as those created by a brisk walk. The method, presented in the journal Cell Reports Physical Science, is a low-cost and efficient way of collecting light breezes as a micro-energy source.

The new device is not technically a turbine. It is a nanogenerator made of two plastic strips in a tube that flutter or clap together when there is airflow. Like rubbing a balloon to your hair, the two plastics become electrically charged after being separated from contact, a phenomenon called the triboelectric effect. But instead of making your hair stand up like Einstein’s, the electricity generated by the two plastic strips is captured and stored.

“You can collect all the breeze in your everyday life,” says senior author Ya Yang of Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences. “We once placed our nanogenerator on a person’s arm, and a swinging arm’s airflow was enough to generate power.”

Allows sweat to evaporate
A breeze as gentle as 1.6 m/s (3.6 mph) was enough to power the triboelectric nanogenerator designed by Yang and his colleagues. The nanogenerator performs at its best when wind velocity is between 4 to 8 m/s (8.9 to 17.9 mph), a speed that allows the two plastic strips to flutter in sync. The device also has a high wind-to-energy conversion efficiency of 3.23 per cent, a value that exceeds previously reported performances on wind energy scavenging. Currently, the research team’s device can power up 100 LED lights and temperature sensors.

“Our intention isn’t to replace existing wind power generation technology. Our goal is to solve the issues that the traditional wind turbines can’t solve,” says Yang. “Unlike wind turbines that use coils and magnets, where the costs are fixed, we can pick and choose low-cost materials for our device. Our device can also be safely applied to nature reserves or cities because it doesn’t have the rotating structures.”

Big goal, small device
In the past, Yang and his colleagues have designed a nanogenerator as small as a coin, but he wants to make it even tinier and more compact with higher efficiency. In the future, Yang and his colleagues would like to combine the device to small electronic devices such as phones, to provide sustainable electric power.

• For more research using triboelectric nanogenerator technology, see Fit Tech Issue 2 2020: Create your own energy

Sign up here to get Fit Tech's weekly ezine and every issue of Fit Tech magazine free on digital.
More features
Editor's letter

Into the fitaverse

Fitness is already among the top three markets in the metaverse, with new technology and partnerships driving real growth and consumer engagement that looks likely to spill over into health clubs, gyms and studios
Fit Tech people

Ali Jawad

Paralympic powerlifter and founder, Accessercise
Users can easily identify which facilities in the UK are accessible to the disabled community
Fit Tech people

Hannes Sjöblad

MD, DSruptive
We want to give our users an implantable tool that allows them to collect their health data at any time and in any setting
Fit Tech people

Jamie Buck

Co-founder, Active in Time
We created a solution called AiT Voice, which turns digital data into a spoken audio timetable that connects to phone systems
Profile

Fahad Alhagbani: reinventing fitness

The team is young and ambitious, and the awareness of technology is very high. We share trends and out-of-the-box ideas almost every day
Opinion

Building on the blockchain

For small sports teams looking to compete with giants, blockchain can be a secret weapon explains Lars Rensing, CEO of Protokol
Innovation

Bold move

We ended up raising US$7m in venture capital from incredible investors, including Andreessen Horowitz, Khosla Ventures, Primetime Partners, and GingerBread Capital
App analysis

Check your form

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Profile

New reality

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Profile

Sohail Rashid

The app is free and it’s $40 to participate in one of our virtual events
Ageing

Reverse Ageing

Many apps help people track their health, but Humanity founders Peter Ward and Michael Geer have put the focus on ageing, to help users to see the direct repercussions of their habits. They talk to Steph Eaves
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Workout Anytime created its app in partnership with Virtuagym. Workout Anytime’s Greg Maurer and Virtuagym’s Hugo Braam explain the process behind its creation
Research

Physical activity monitors boost activity levels

Researchers at the University of Copenhagen have conducted a meta analysis of all relevant research and found that the body of evidence shows an impact
Editor's letter

Two-way coaching

Content providers have been hugely active in the fit tech market since the start of the pandemic. We expect the industry to move on from delivering these services on a ‘broadcast-only’ basis as two-way coaching becomes the new USP
Fit Tech People

Laurent Petit

Co-founder, Active Giving
The future of sports and fitness are dependent on the climate. Our goal is to positively influence the future of our planet by instilling a global vision of wellbeing and a sense of collective action
Fit Tech People

Adam Zeitsiff

CEO, Intelivideo
We don’t just create the technology and bail – we support our clients’ ongoing hybridisation efforts
Fit Tech People

Anantharaman Pattabiraman

CEO and co-founder, Auro
When you’re undertaking fitness activities, unless you’re on a stationary bike, in most cases it’s not safe or necessary to be tied to a screen, especially a small screen
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Managing partner, Endorphinz
We noticed a big gap in the market – customers needed better insights but also recommendations on what to do, whether that be customer acquisition, content creation, marketing and more
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