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Concrete ‘battery’ now packs 10 times the power

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Concrete ‘battery’ now packs 10 times the power


An electron-conducting carbon concrete (ec³)-based arch structure integrates supercapacitor electrodes for dual functionality. The prototype demonstrates both structural load bearing and the ability to power an LED, with the light’s intensity varying under applied load, highlighting the potential for real-time structural health monitoring via the supercapacitor. Credit: MIT EC³ Hub.

Concrete already builds our world, and now it’s one step closer to powering it, too. Made by combining cement, water, ultra-fine carbon black (with nanoscale particles), and electrolytes, electron-conducting carbon concrete (ec3, pronounced “e-c-cubed”) creates a conductive “nanonetwork” inside concrete that could enable everyday structures like walls, sidewalks, and bridges to store and release electrical energy. In other words, the concrete around us could one day double as giant “batteries.”

As MIT researchers report in a new PNAS paper, optimized electrolytes and manufacturing processes have increased the capacity of the latest ec3 supercapacitors by an order of magnitude.

In 2023, storing enough energy to meet the daily needs of the average home would have required about 45 cubic meters of ec3, roughly the amount of concrete used in a typical basement. Now, with the improved , that same task can be achieved with about 5 cubic meters, the volume of a typical basement wall.

“A key to the sustainability of concrete is the development of ‘multifunctional concrete,’ which integrates functionalities like this energy storage, self-healing, and carbon sequestration. Concrete is already the world’s most-used construction material, so why not take advantage of that scale to create other benefits?” asks Admir Masic, lead author of the new study, MIT Electron-Conducting Carbon-Cement-Based Materials Hub (EC³ Hub) co-director, and associate professor of civil and environmental engineering (CEE) at MIT.

The improved energy density was made possible by a deeper understanding of how the nanocarbon black network inside ec3 functions and interacts with electrolytes.

Using focused ion beams for the sequential removal of thin layers of the ec3 material, followed by high-resolution imaging of each slice with a (a technique called FIB-SEM tomography), the team across the EC³ Hub and MIT Concrete Sustainability Hub was able to reconstruct the conductive nanonetwork at the highest resolution yet. This approach allowed the team to discover that the network is essentially a fractal-like “web” that surrounds ec3 pores, which is what allows the electrolyte to infiltrate and for current to flow through the system.

“Understanding how these materials ‘assemble’ themselves at the nanoscale is key to achieving these new functionalities,” adds Masic.

Equipped with their new understanding of the nanonetwork, the team experimented with different electrolytes and their concentrations to see how they impacted energy storage density.

As Damian Stefaniuk, first author and EC³ Hub research scientist, highlights, “we found that there is a wide range of electrolytes that could be viable candidates for ec3. This even includes seawater, which could make this a good material for use in coastal and marine applications, perhaps as support structures for offshore wind farms.”

At the same time, the team streamlined the way they added electrolytes to the mix. Rather than curing ec3 electrodes and then soaking them in electrolyte, they added the electrolyte directly into the mixing water. Since electrolyte penetration was no longer a limitation, the team could cast thicker electrodes that stored more energy.

The team achieved the greatest performance when they switched to organic electrolytes, especially those that combined quaternary ammonium salts—found in everyday products like disinfectants—with acetonitrile, a clear, conductive liquid often used in industry. A cubic meter of this version of ec3—about the size of a refrigerator—can store over 2 kilowatt-hours of energy. That’s about enough to power an actual refrigerator for a day.

While batteries maintain a higher energy density, ec3 can in principle be incorporated directly into a wide range of architectural elements—from slabs and walls to domes and vaults—and last as long as the structure itself.

“The Ancient Romans made great advances in concrete construction. Massive structures like the Pantheon stand to this day without reinforcement. If we keep up their spirit of combining with architectural vision, we could be at the brink of a new architectural revolution with multifunctional concretes like ec3,” proposes Masic.

Taking inspiration from Roman architecture, the team built a miniature ec3 arch to show how structural form and energy storage can work together. Operating at 9 volts, the arch supported its own weight and additional load while powering an LED light.

However, something unique happened when the load on the arch increased: the light flickered. This is likely due to the way stress impacts electrical contacts or the distribution of charges.

“There may be a kind of self-monitoring capacity here. If we think of an ec3 arch at an architectural scale, its output may fluctuate when it’s impacted by a stressor like high winds. We may be able to use this as a signal of when and to what extent a structure is stressed, or monitor its overall health in real time,” envisions Masic.

The latest developments in ec³ technology bring it a step closer to real-world scalability. It’s already been used to heat sidewalk slabs in Sapporo, Japan, due to its thermally conductive properties, representing a potential alternative to salting.

“With these higher energy densities and demonstrated value across a broader application space, we now have a powerful and flexible tool that can help us address a wide range of persistent energy challenges,” explains Stefaniuk.

“One of our biggest motivations was to help enable the renewable energy transition. Solar power, for example, has come a long way in terms of efficiency. However, it can only generate power when there’s enough sunlight. So, the question becomes: How do you meet your energy needs at night, or on cloudy days?”

Franz-Josef Ulm, EC³ Hub co-director and CEE professor, continues, “The answer is that you need a way to store and release energy. This has usually meant a battery, which often relies on scarce or harmful materials. We believe that ec3 is a viable substitute, letting our buildings and infrastructure meet our energy storage needs.”

The team is working toward applications like parking spaces and roads that could charge electric vehicles, as well as homes that can operate fully off the grid.

“What excites us most is that we’ve taken a material as ancient as concrete and shown that it can do something entirely new,” says James Weaver, a co-author on the paper who is an associate professor of design technology and materials science and engineering at Cornell University, as well as a former EC³ Hub researcher.

“By combining modern nanoscience with an ancient building block of civilization, we’re opening a door to infrastructure that doesn’t just support our lives, it powers them.”

More information:
Damian Stefaniuk et al, High energy density carbon–cement supercapacitors for architectural energy storage, Proceedings of the National Academy of Sciences (2025). DOI: 10.1073/pnas.2511912122

This story is republished courtesy of MIT News (web.mit.edu/newsoffice/), a popular site that covers news about MIT research, innovation and teaching.

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Concrete ‘battery’ now packs 10 times the power (2025, October 2)
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A Single Strike Won’t Shut Off the Gulf’s Desalination System

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A Single Strike Won’t Shut Off the Gulf’s Desalination System


Across the region, facilities tied to water and power—including desalination plants—have been damaged or exposed to risk as Iranian strikes extend beyond traditional targets.

A single strike, however, is unlikely to shut off the gulf’s water supply. The system is designed to absorb isolated disruption, but sustained or multisite attacks would begin to strain supply far more quickly.

“In the Gulf, desalination is built with enough breathing room that losing one plant doesn’t immediately show up at the tap,” says Rabee Rustum, professor of water and environmental engineering at Heriot-Watt University Dubai.

In Kuwait, Iranian drone attacks have damaged two power and desalination facilities and ignited fires at two oil sites. Other sites, including Fujairah in the UAE, have been identified as potentially exposed.

“Striking desalination plants would be a strategic move, but it would also come very close to, and in some cases cross, a red line,” says Andreas Krieg, senior lecturer at the School of Security Studies at King’s College London.

Water infrastructure, Krieg explains, occupies a distinct category. “Water infrastructure is not just another utility. In places that depend on desalination, it underpins civilian survival, public health, hospital function, sanitation, and basic state legitimacy.”

Krieg notes that international humanitarian law gives special protection to civilian objects and to objects indispensable to the survival of the civilian population. “Which is precisely why attacks on water systems carry such grave legal and moral weight,” Krieg adds.

The incidents highlight a structural reality: Desalination is central to water supply in the gulf, and disruption carries immediate implications for daily life.

How the System Absorbs Disruption

At first glance, desalination appears vulnerable. Shut down a plant, and supply is reduced. In practice, the system is designed with layers of redundancy.

Plants operate across multiple locations, allowing output to be redistributed if one facility slows down. Water is also stored at different points across the network, including central reservoirs and building-level tanks, creating a buffer that delays disruption.

According to a statement to WIRED Middle East by Veolia, an environmental services provider whose technologies account for nearly 19 percent of desalination capacity in the region, “the region’s water supply is diversified thanks to a network of numerous facilities distributed along the coastline.”

The company adds that distribution systems are interconnected, allowing plants to “support and substitute for one another when necessary,” helping maintain continuity of service.

In the UAE, storage capacity typically covers around one week, while in other parts of the region it may be limited to two to three days, Veolia says.

In practice, this means the system can absorb disruption for a limited period. Once reserves are depleted, water supply depends on whether plants can continue producing enough water to meet demand.

The System That Produces Water

Unlike most regions, the Gulf does not rely on rivers or rainfall. It depends on a network of desalination plants along its coastline that convert seawater into potable water on a continuous basis.

Seawater is drawn into treatment facilities, filtered and processed either through reverse osmosis—forcing it through membranes to remove salt and impurities—or through thermal methods that evaporate and condense water. The resulting supply is distributed through pipelines, stored in reservoirs, and delivered to homes, hospitals, and industry.

This is not a flexible system. It is designed to operate continuously, producing water at a scale that sustains cities, industrial activity, and essential services. Gulf states produce roughly 40 percent of the world’s desalinated water, operating more than 400 plants across the region.

Dependence varies by country but is high everywhere. In the UAE, desalination accounts for 41 to 42 percent of total water supply, while in Kuwait, it provides around 90 percent of drinking water, and in Saudi Arabia, approximately 70 percent.

When Disruption Becomes Visible

For residents, disruption would not be felt immediately—water would continue to flow.

Rustum explains that buildings are supported by internal storage and pumping systems, meaning early changes in supply may not be apparent. In many cases, water pressure remains stable, even as the wider system adjusts.



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Border Patrol Agents Sold Challenge Coins With ‘Charlotte’s Web’ Characters in Riot Gear

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Border Patrol Agents Sold Challenge Coins With ‘Charlotte’s Web’ Characters in Riot Gear


US Border Patrol agents are raising money by selling coins that commemorate last year’s wave of immigration enforcement “operations” across the country, along with other merchandise. The funds are for nonprofit organizations that list Border Patrol buildings as their address in IRS paperwork. At least two of the organizations have dedicated US Customs and Border Protection email addresses.

The front side of one coin for sale reads, “NORTH AMERICAN TOUR 2025,” along with the acronyms for US Border Patrol and the acronym for “fuck around and find out”—a phrase that was initially popularized by the far-right group the Proud Boys and has been used by various Trump officials. In the center, the coin depicts a gas mask, a riot control smoke grenade, and a pepper ball launcher. On the other side, the coin appears to have a portrait of Border Patrol’s now retired commander-at-large, Gregory Bovino, with his arm raised in a salute, along with the text “COMING TO A CITY NEAR YOU!” It lists seven cities, many of which actually saw federal enforcement surges in 2025: Chicago, Los Angeles, Memphis, Phoenix, Portland, Charlotte, and Atlanta.

The coin is for sale by Willcox Morale Welfare and Recreation, a nonprofit that the IRS most recently declared tax-exempt during the Biden administration and whose address on IRS paperwork matches that of the Willcox Border Patrol Station in Arizona. A request for comment sent to Willcox MWR’s dedicated CBP email address went unanswered.

Employees of the Department of Homeland Security, the parent agency for Border Patrol, are allowed to start private, not-for-profit employee associations within DHS, so long as they get formally recognized by the agency and follow certain rules. According to DHS policies, officially recognized groups can fundraise using government property and create merchandise with the agency’s name and logos–but they have to receive advance approval from the agency.

Willcox MWR is just one of several groups across the country that cater to Border Patrol agents and refer to themselves as MWRs, a reference to the US military’s “morale, welfare and recreation” programs. The groups tend to throw holiday events and retirement parties, and sometimes raise money for the families of agents going through hard times, including those not getting paid during the current shutdown.

Many MWRs also sell customized medallions known as “challenge coins” that commemorate specific teams or events. While anyone, including CBP alumni, can design and sell coins, current DHS employees are not supposed to use government resources to sell ones that use the agency’s seals or logos without permission, or ones that the agency considers inappropriate or unprofessional.

CBP did not provide comment about its relationship to Willcox MWR or any other nonprofit mentioned in this story, nor whether the agency had green-lit the “North American Tour” coin design, ahead of publication.

Under Willcox MWR’s Facebook post about the “North American Tour” coin, someone named Juan Diego commented, “Sign up SDC BK5 MWR for 10.”

“Shoot us an email,” someone managing the Willcox MWR account replied, giving out what appeared to be a dedicated cbp.dhs.gov email address for the group.

SDC BK5 MWR, also a registered nonprofit, lists an address on its website that matches that of a government facility in Chula Vista, California. It says on its site that it was started by San Diego Sector Border Patrol agents and sells custom merchandise “designed to raise funds for morale and relief efforts.”

Diego did not respond to a request for comment.

The SDC BK5 MWR website has listings for over 200 different products in addition to the North American Tour coin. One of those listings was a “Chicago Midway Blitz” challenge coin in the shape of a gas mask that doubles as a bottle opener. Embossed around the edges of the coin are the names of several municipalities and neighborhoods caught up in DHS’s immigration enforcement surge of the same name last fall. Like the North American Tour coin, it features the US Border Patrol logo and the acronym for “fuck around and find out.” Opponents of the Trump administration’s immigration enforcement activity in Illinois are unamused.



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One of Our Favorite 360 Cams Is 35 Percent Off

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One of Our Favorite 360 Cams Is 35 Percent Off


Tired of taking your action camera on an adventure, only to get home and find out you missed the action with a bad angle? One option is to switch to a 360-degree action cam, so you can capture all of the action and then edit down to just the good stuff later. One of our favorite options, the DJI Osmo 360, is currently available for just $390 on Amazon, a $209 discount from its usual price, and it comes with a selfie stick and an extra battery.

The DJI Osmo 360 achieves its impressive all-around video quality by leveraging a pair of 1/1.1-inch sensors, larger than some other offerings, and by supporting 10-bit color. You can really see that in the camera’s output, with colors that are vivid and bold, to the point that you may need to dial them back a bit in post if you want something more natural. With support for up to 50 frames per second at 8K when recording in 360 degrees, or 120 fps at 4K when shooting with only one sensor, you’ll have plenty of material to work with. In our testing, it ran for just shy of two hours at 30 fps, which is also around the time the internal storage had filled up anyway.

If you plan on catching any serious discussions with your Osmo 360, you’ll be pleased to know it connects directly to DJI’s line of wireless lavalier microphones, including the excellent and frequently discounted DJI Mic 2 and Mic Mini. If you want to mount it to something other than the included 1.2-meter selfie stick, it has both DJI’s magnetic attachment system and a more traditional ¼”-20 tripod mount. The DJI Mimo app lets you control the camera and adjust any settings, and there’s even a simple editor for on-the-fly production. For desktop users, DJI Studio has even more in-depth settings and editing options, in case you don’t want to pay for Premiere.

The DJI Osmo 360 is one of our favorite action cameras, and is particularly appealing at the discounted price point, but make sure to check out our full review for more info, or head over to our full roundup to see what else is available.



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