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Palladium filters could enable cheaper, more efficient generation of hydrogen fuel

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Palladium filters could enable cheaper, more efficient generation of hydrogen fuel


Palladium plug membrane at the end of the membrane fabrication process (left). Dashed green lines outline the membrane. Scanning electron microscopy image of the membrane shows the palladium plugs embedded inside the pores of the silica support (right). Credit: Courtesy of the researchers, edited by MIT News

Palladium is one of the keys to jump-starting a hydrogen-based energy economy. The silvery metal is a natural gatekeeper against every gas except hydrogen, which it readily lets through. For its exceptional selectivity, palladium is considered one of the most effective materials at filtering gas mixtures to produce pure hydrogen.

Today, palladium-based membranes are used at commercial scale to provide pure for semiconductor manufacturing, food processing, and fertilizer production, among other applications in which the membranes operate at modest temperatures. If palladium membranes get much hotter than around 800 Kelvin, they can break down.

Now, MIT engineers have developed a new palladium that remains resilient at much higher temperatures. Rather than being made as a continuous film, as most membranes are, the new design is made from palladium that is deposited as “plugs” into the pores of an underlying supporting material. At high temperatures, the snug-fitting plugs remain stable and continue separating out hydrogen, rather than degrading as a surface film would.

The thermally stable design opens opportunities for membranes to be used in hydrogen-fuel-generating technologies such as compact steam methane reforming and ammonia cracking—technologies that are designed to operate at much higher temperatures to produce hydrogen for zero-carbon-emitting fuel and electricity.

“With further work on scaling and validating performance under realistic industrial feeds, the design could represent a promising route toward practical membranes for high-temperature hydrogen production,” says Lohyun Kim Ph.D. ’24, a former graduate student in MIT’s Department of Mechanical Engineering.

Kim and his colleagues report details of the new membrane in a study appearing today in the journal Advanced Functional Materials. The study’s co-authors are Randall Field, director of research at the MIT Energy Initiative (MITEI); former MIT chemical engineering graduate student Chun Man Chow Ph.D. ’23; Rohit Karnik, the Jameel Professor in the Department of Mechanical Engineering at MIT and the director of the Abdul Latif Jameel Water and Food Systems Lab (J-WAFS); and Aaron Persad, a former MIT research scientist in mechanical engineering who is now an assistant professor at the University of Maryland Eastern Shore.

Compact future

The team’s new design came out of a MITEI project related to fusion energy. Future fusion power plants, such as the one MIT spinout Commonwealth Fusion Systems is designing, will involve circulating hydrogen isotopes of deuterium and tritium at extremely high temperatures to produce energy from the isotopes’ fusing. The reactions inevitably produce other gases that will have to be separated, and the hydrogen isotopes will be recirculated into the main reactor for further fusion.

Similar issues arise in a number of other processes for producing hydrogen, where gases must be separated and recirculated back into a reactor. Concepts for such recirculating systems would require first cooling down the gas before it can pass through hydrogen-separating membranes—an expensive and energy-intensive step that would involve additional machinery and hardware.

“One of the questions we were thinking about is: Can we develop membranes which could be as close to the reactor as possible, and operate at higher temperatures, so we don’t have to pull out the gas and cool it down first?” Karnik says. “It would enable more energy-efficient, and therefore cheaper and compact, fusion systems.”

The researchers looked for ways to improve the temperature resistance of palladium membranes. Palladium is the most effective metal used today to separate hydrogen from a variety of gas mixtures. It naturally attracts hydrogen molecules (H2) to its surface, where the metal’s electrons interact with and weaken the molecule’s bonds, causing H2 to temporarily break apart into its respective atoms. The individual atoms then diffuse through the metal and join back up on the other side as pure hydrogen.

Palladium is highly effective at permeating hydrogen, and only hydrogen, from streams of various gases. But conventional membranes typically can operate at temperatures of up to 800 Kelvin before the film starts to form holes or clumps up into droplets, allowing other gases to flow through.

Plugging in

Karnik, Kim and their colleagues took a different design approach. They observed that at , palladium will start to shrink up. In engineering terms, the material is acting to reduce surface energy. To do this, palladium, and most other materials and even water, will pull apart and form droplets with the smallest surface energy. The lower the surface energy, the more stable the material can be against further heating.

This gave the team an idea: If a supporting material’s pores could be “plugged” with deposits of palladium—essentially already forming a droplet with the lowest surface energy—the tight quarters might substantially increase palladium’s heat tolerance while preserving the membrane’s selectivity for hydrogen.

To test this idea, they fabricated small chip-sized samples of membrane using a porous silica supporting layer (each pore measuring about half a micron wide), onto which they deposited a very thin layer of palladium. They applied techniques to essentially grow the palladium into the pores, and polished down the surface to remove the palladium layer and leave palladium only inside the pores.

They then placed samples in a custom-built apparatus in which they flowed hydrogen-containing gas of various mixtures and temperatures to test its separation performance. The membranes remained stable and continued to separate hydrogen from other gases even after experiencing temperatures of up to 1,000 Kelvin for over 100 hours—a significant improvement over conventional film-based membranes.

“The use of palladium film membranes are generally limited to below around 800 Kelvin, at which point they degrade,” Kim says. “Our plug design therefore extends palladium’s effective heat resilience by roughly at least 200 Kelvin and maintains integrity far longer under extreme conditions.”

These conditions are within the range of hydrogen-generating technologies such as steam methane reforming and ammonia cracking.

Steam methane reforming is an established process that has required complex, energy-intensive systems to preprocess methane to a form where pure hydrogen can be extracted. Such preprocessing steps could be replaced with a compact “membrane reactor,” through which a methane gas would directly flow, and the membrane inside would filter out pure hydrogen.

Such reactors would significantly cut down the size, complexity, and cost of producing hydrogen from steam methane reforming, and Kim estimates a membrane would have to work reliably in temperatures of up to nearly 1,000 Kelvin. The team’s new membrane could work well within such conditions.

Ammonia cracking is another way to produce hydrogen, by “cracking” or breaking apart ammonia. As ammonia is very stable in liquid form, scientists envision that it could be used as a carrier for hydrogen and be safely transported to a hydrogen fuel station, where ammonia could be fed into a membrane reactor that again pulls out hydrogen and pumps it directly into a fuel cell vehicle.

Ammonia cracking is still largely in pilot and demonstration stages, and Kim says any membrane in an ammonia cracking reactor would likely operate at temperatures of around 800 Kelvin—within the range of the group’s new plug-based design.

Karnik emphasizes that their results are just a start. Adopting the membrane into working reactors will require further development and testing to ensure it remains reliable over much longer periods of time.

“We showed that instead of making a film, if you make discretized nanostructures you can get much more thermally stable membranes,” Karnik says. “It provides a pathway for designing membranes for extreme temperatures, with the added possibility of using smaller amounts of expensive , toward making hydrogen production more efficient and affordable. There is potential there.”

More information:
Nanostructured Hydrogen-Selective Palladium “Plug” Membranes Capable of Withstanding High Temperatures, Advanced Functional Materials (2025). advanced.onlinelibrary.wiley.c … .1002/adfm.202516184

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

Citation:
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If You’re Building a Home Gym, Start With Dumbbells and a Yoga Mat

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If You’re Building a Home Gym, Start With Dumbbells and a Yoga Mat


To join or not to join a gym: That is the question. If you opt out of building a home gym, you can join a club and have access to more weights and machines. Friends and classes motivate you to keep coming, and that monthly bill keeps you disciplined. On the other hand, gym memberships are steep, workouts can get hijacked by bullies, and going to the gym is an additional commute.

My gym tardiness, however, will likely catch up to me. One of the most consistent messages from health and fitness experts today is that lifting weights has immeasurable benefits. Strength training allows us to keep doing the things we love well into our advanced years. It reduces blood sugar, lowers blood pressure, burns calories, and reduces inflammation. A recent review of studies in the British Journal of Sports Medicine by Harvard Medical School found that strength training is linked to lower risk for cardiovascular disease, diabetes, and cancer and provides a 10 to 17 percent lower overall risk of early death.

But you don’t need all the time and money in the world to have a great home gym. Reviews editor Adrienne So and I have been slowly adding to our existing, minimalist home gyms in our living rooms and garage—a roughly 10- by 10-foot patch in our basements and living rooms. There’s a ton of equipment out there, but for maximum results, I asked two physical therapists—Grace Fenske at Excel North Physical Therapy and Performance and Samuel Hayden at Limit Less Physical Therapy—for their recommendations.

Here’s a PT-recommended guide for an ultrasimple setup that will keep you pumped and motivated. Don’t see anything you like? Don’t forget to check out our existing guides to the Best Running Shoes, the Best Fitness Trackers, or the Best Walking Pads.

Jump To

Adjustable Dumbbells

Yes, these are very pricey. But people outgrow their small dumbbells very quickly, and if you bite the bullet early, adjustable dumbbells take up a lot less space than individual dumbbell or kettlebell sets. The Nüobell adjustable dumbbells required 38 patents and allow users to increase weight in increments of five pounds all the way up to 80 with a twist of the handle. Each dumbbell set replaces 32 individual dumbbells. In a cramped space, that’s a game changer.

The way that both Steph’s Nüobells and my Nike adjustable dumbbells work is that the full barbell fits into a cradle. (You can also mount the barbells in a stand.) When the user twists the handle to five pounds, the aluminum bar with grooves will grab onto the first hollowed-out plate, which is 2.5 pounds on each side of the barbell. With each subsequent turn of the handle the bar will pick up heavier weight in increments of five pounds. A safety hook at the bottom of the cradle ensures the barbell weight must be locked in place before lifting.

I like my Nike dumbbells because the end of the dumbbell is flat, which means I can rest it on its end on my thigh without putting a divot in my leg. Also, the plates aren’t round. If you have a big round dumbbell on the floor, or especially in your garage, it will find the nearest incline and roll away on top of a house pet or child. You can still take individual plates out of the rack if you need them for leverage under your heel or for mobility exercises. Whichever one you choose, though, both Steph and I recommend getting a floor stand to decrease strain on your back. —Adrienne So



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This AI Tool Will Tell You to Stop Slacking Off

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This AI Tool Will Tell You to Stop Slacking Off


I’ve tested a lot of software tools over the years designed to block distractions and keep you focused. None of them work perfectly, mostly because of context.

Reddit, for example, is something I should generally avoid during the workday, so I tend to block it—this is a good decision for me overall. The problem is that sometimes the only place I can find a particular piece of information online is in a Reddit thread, meaning that to get that information I need to turn off my distraction-blocking tool. Then I inevitably end up down some kind of rabbit hole.

This is the exact problem Fomi, a macOS distraction-blocking tool, is built to solve. The application asks you what you’re working on, then watches everything you do on your Mac desktop—every app you open—and uses AI to analyze what’s on your screen. The tool can tell, from context, whether you’re using a particular website productively or as a distraction.

Zach Yang, part of the team behind the app, tells me on Discord he dreamed up the app after talking with a friend who was studying for an MBA. “He needed YouTube for study videos, so web/app blockers didn’t work, and once he was watching, recommendations would often pull him away,” Yang says. “That’s when I started thinking about using AI to solve this. I built a small prototype to test whether current models were capable of distinguishing distraction from actual work, and the results were good enough that I decided to turn it into a real project.”

Fomi offers a three-day free trial. If you decide you like it, subscription plans cost $8 per month. However, since the tool uploads screenshots of your desktop to an AI model in the cloud, there are privacy concerns you will need to weigh before deciding if a tool like this is right for you.

Watch This Space

I’ve been trying out this application for a couple of days. The first time you launch it, you’re asked what you do day-to-day and what kind of tools you use to do it. Then, when it’s time to focus, you tell the software what you’re working on and which tools you plan to use while doing it.

As you work, a green dot and a timer appear at the top of the screen, surrounding your MacBook’s notch. If you switch to a potentially distracting application, the dot changes to yellow. If you start engaging in things that are clearly distractions, the dot turns red and an animated tomato splats across the screen. You’ll see a custom message telling you to get to work—the app calls out your specific distraction.

Courtesy of Justin Pot



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UKRI sets out strategy to make UK an AI leader by 2031 | Computer Weekly

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UKRI sets out strategy to make UK an AI leader by 2031 | Computer Weekly


UK Research and Innovation (UKRI) has laid out a strategy to help the UK boost its artificial intelligence (AI) capabilities, underpinned by research, access to shared assets, and support for innovators and universities.

It has published a six-point plan with a target completion date of 2031, by which time it says the research it supports will make the UK a global leader in explainable, human‑in‑the‑loop systems, agentic AI, edge computing and sustainable models. The 2031 target date also sets out ambitions for faster, reproducible science across disciplines through UKRI‑supported national AI testbeds and shared methods, as well as growing the research and innovation workforce to produce more deep technical experts and those who can drive AI companies and research groups.

From a data access perspective, UKRI’s goal is to open more environmentally sustainable compute and data foundations that provide equitable access to AI research resources through UKRI‑enabled infrastructure and new models released based on these resources, reusable, privacy‑respecting datasets, and Trusted Research Environments (TREs) that accelerate discovery and ensure data providers benefit from their contributions.

The UKRI’s AI safety objectives for 2031 include the UK becoming a co‑leader on global standards for safer, greener AI through UKRI international partnerships.

It also aims to foster a culture where the UK develops and fully harnesses the power of AI to drive economic growth, improve lives and livelihoods, and tackle major global and societal challenges.

Discussing the strategy, Charlotte Deane, senior responsible owner for the UKRI AI programme and executive chair of the Engineering and Physical Sciences Research Council, spoke about the UK’s strengths in mathematics, which puts it in a strong position to grow its AI ambitions. “We must make bold choices in areas where the UK can genuinely lead the world. UKRI will play a central role in backing the full innovation pathway from fundamental research to prototypes to scale-up,” she said.

“By uniting universities, businesses, industry and government, we can unlock the potential we have long had but have not yet fully mobilised,” Deane added.

Among the UKRI initiatives currently deployed are the Radar AI system, which detects faults on the railway network in real time, and the IXI Brain Atlas, which is supporting more than 40 clinical trials into degenerative diseases such as Alzheimer’s. 

Commenting on the strategy, UK AI minister Kanishka Narayan said: “The potential of combining our AI expertise with our peerless R&D community is a game-changer. This plan will harness AI to accelerate both the pace and possibility of scientific endeavour. 

“We are already seeing AI change the game for what’s possible in fields from health to energy and beyond. Boldly backing this technology is how we push our great British innovators to further success, and build a path to breakthroughs that boost our health, wealth and wellbeing.”

Deputy prime minister David Lammy, who is leading the UK delegation at the India AI Impact Summit, said: “The UK is backing its pioneering AI leadership with more than £1.6bn in investment to make sure the best of British expertise develops the next wave of AI innovations. Together, we are turning potential into progress, and that’s the ambition I am bringing to the AI Summit in India this week.”



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