Scientists in the U.S. and China have fashioned the ultimate in power dressing: a fabric that recovers energy from movement and at the same time turns sunlight into electricity.
A bracelet made from fabric woven with special energy-harvesting strands that collect electricity from the sun and motion.Georgia Institute of Technology
It may be a while before the new material reaches the high street stores and delivers significant energy savings, but it means that a smartphone in a pocket could charge itself from the fabric around it.
And it stands as yet another example of the burst of global ingenuity by materials scientists and engineers in response to the spectrum of climate change driven by rising greenhouse gas emissions.
Researchers have already tested a "bionic leaf" that can harvest sunlight energy 10 times more efficiently than chlorophyll-powered foliage.
They have crafted windows and solar panels from wood, tested a "carbon negative" car battery that replaces its cathode material from carbon dioxide in the atmosphere and confected a brew of conifer essence and gut bacteria to make high-octane rocket fuel.
They have even devised an ultra-thin membrane that could capture nine-tenths of the carbon dioxide emissions from coal-burning power stations.
But the latest report from the laboratories—published in Nature Energy journal—could end up being tested in the field, as a tent fabric, or in the office, as curtains that could power a lighting system or as clothing that could exploit the wearer's activity and place in the sun.
The scientists used commercially-available machinery to weave together solar cells fashioned from lightweight polymer fibers with a second and very different thread of fibre-based nanogenerators that exploit the tribo-electric effect: that is, threads that could recover electrical power from any form of movement—rotation, sliding or vibration.
"This hybrid power textile device presents a novel solution to charging devices in the field, from something as simple as the wind blowing on a sunny day," professor Zhong Lin Wang, specialist in nanomaterials synthesis at Georgia Tech School of Materials Science and Engineering, said.
A piece of fabric woven with special strands of material that harvest electricity from the sun and motion.Georgia Institute of Technology
The new fabric is 320 millionths of a meter thick, woven together with strands of wool. It is, Professor Wang said, "highly flexible, breathable, lightweight and adaptable to a range of uses."
The energy-harvesting textile is based on common polymer materials that, he said, are not expensive to make and are environmentally friendly. The electrodes are also delivered by a low-cost process, so large-scale manufacture should be possible.
The scientists report that a 4 centimeter by 5 centimeter fragment of the hybrid power textile is capable of stably delivering output power of 0.5 milliwatts, and has been shown to charge a commercial capacitor up to two volts in one minute in ambient sunlight while being mechanically moved.
"The textile could continuously power an electronic watch, directly charge a cell phone, or drive water-splitting reactions," the authors, from Georgia Tech and from Chongqing University and Beijing Institute of Nanoenergy and Nanosystems in China, said.
A "trash tsunami" has washed ashore on the beaches of Honduras, endangering both wildlife and the local economy.
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More long-finned pilot whales were found stranded today on beaches in Tasmania, Australia. About 500 whales have become stranded, including at least 380 that have died, the AP reported. It is the largest mass stranding in Australia's recorded history.
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By Harry Kretchmer
By 2030, almost a third of all the energy consumed in the European Union must come from renewable sources, according to binding targets agreed in 2018. Sweden is helping lead the way.
Sweden is a world leader in renewable energy consumption. Swedish Institute/World Bank
Naturally Warm<p>54% of Sweden's power comes from renewables, and is helped by its geography. With plenty of moving water and 63% forest cover, it's no surprise the <a href="https://sweden.se/nature/energy-use-in-sweden/#" target="_blank">two largest renewable power sources</a> are hydropower and biomass. And that biomass is helping support a local energy boom.</p><p>Heating is a key use of energy in a cold country like Sweden. In recent decades, as fuel oil taxes have increased, the country's power companies have turned to renewables, like biomass, to fuel local 'district heating' plants.</p><p>In Sweden these trace their <a href="https://www.sciencedirect.com/science/article/pii/S0360544217304140#fig3" target="_blank">origins back to 1948</a>, when a power station's excess heat was first used to heat nearby buildings: steam is <a href="https://www.sciencedirect.com/topics/engineering/district-heating-system" target="_blank">forced along a network of pipes</a> to wherever it's needed. Today, there are around 500 district heating systems across the country, from major cities to small villages, providing heat to homes and businesses.</p><p>District heating used to be fueled mainly from the <a href="https://www.sciencedirect.com/science/article/pii/S0360544217304140" target="_blank">by-products of power plants</a>, waste-to-energy plants and industrial processes. These days, however, Sweden is bringing more renewable sources into the mix. And as a result of competition, this localized form of power is now the country's<a href="https://www.sciencedirect.com/science/article/pii/S0360544217304140#fig3" target="_blank" rel="noopener noreferrer"> home-heating market leader.</a></p>
Sweden is using smart grids to turn buildings into energy producers. Huang et al/Elsevier
Energy ‘Prosumers’<p>But Sweden doesn't stop at village-level heating solutions. Its new breed of energy-generation takes hyper-local to the next level.</p><p>One example is in the city of Ludivika where 1970s flats <a href="https://www.buildup.eu/sites/default/files/content/transforming-a-residential-building-cluster-into-electricity-prosumers-in-sweden.pdf" target="_blank">have recently been retrofitted with the latest smart energy technology</a>.</p><p>48 family apartments spread across 3 buildings have been given photovoltaic solar panels, thermal energy storage and heat pump systems. A micro energy grid connects it all, and helps charge electric cars overnight.</p><p>The result is a cluster of 'prosumer' buildings, producing rather than consuming enough power for 77% of residents' needs. With <a href="http://www.diva-portal.org/smash/get/diva2:1232060/FULLTEXT01.pdf" target="_blank" rel="noopener noreferrer">high levels of smart meter usage</a>, it's a model that looks set to spread across Sweden.</p>
<div id="d7bf9" class="rm-shortcode" data-rm-shortcode-id="8757b138d5570bec9d6aad18074a429a"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1273556364263071744" data-partner="rebelmouse"><div style="margin:1em 0">Read more about Western Harbour and book a visit: https://t.co/ujSmVs9rNK 🏡🌳🌊 https://t.co/C5PuPziqIM</div> — Smart City Sweden (@Smart City Sweden)<a href="https://twitter.com/SmartCitySweden/statuses/1273556364263071744">1592474473.0</a></blockquote></div>
Scaling Up<p>A recent development by E.ON in Hyllie, a district on the outskirts of Malmö, southern Sweden, <a href="https://www.eonenergy.com/blog/2019/February/sweden-smart-city" target="_blank">has scaled up the smart grid principle</a>. Energy generation comes from local wind, solar, biomass and waste sources.</p><p>Smart grids then balance the power, react to the weather, deploying extra power when it's colder or putting excess into battery storage when it's warm. The system is not only more efficient, but bills have fallen.</p><p>Smart energy developments like those in Hyllie, Ludivika, and renewable-driven district heating, offer a radical alternative to the centralized energy systems many countries rely on today.</p><p>The EU's leaders have a challenge: how to generate 32% of energy from renewables by 2030. Sweden offers a vision of how technology and local solutions can turn a goal into a reality.</p>
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By Jessica Corbett
In another win for climate campaigners, leaders of 12 major cities around the world — collectively home to about 36 million people — committed Tuesday to divesting from fossil fuel companies and investing in a green, just recovery from the ongoing coronavirus pandemic.
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