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Unlocking the Secrets of Supercritical Water: A New Understanding of Its Structure

When exposed to high temperatures and pressure, water enters a state in which liquid and gas can no longer be distinguished. For a long time, there has been controversy about how this looks like on a molecular level.

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Supercritical water, a state of water that exists at extreme temperatures and pressures, has long been shrouded in mystery. Recent research by scientists at Ruhr University Bochum, Germany, has shed light on its structure, disproving a previous theory that it forms clusters within which hydrogen bonds connect the molecules.

Using a combination of terahertz spectroscopy and molecular dynamics simulations, Dr. Katja Mauelshagen, Dr. Gerhard Schwaab, and Professor Martina Havenith from the Chair of Physical Chemistry II collaborated with Dr. Philipp Schienbein and Professor Dominik Marx from the Chair of Theoretical Chemistry to unlock the secrets of supercritical water.

The researchers found that the terahertz spectra of liquid and gaseous water differed significantly, but those of supercritical water and the gaseous state looked virtually identical. This suggests that water molecules form just as few hydrogen bonds in the supercritical state as they do in the gaseous state, meaning there are no molecular clusters.

The results were supported by ab initio molecular dynamics simulations performed by Philipp Schienbein, which showed that two water molecules in the supercritical state remain close to each other only for a short time before separating. The bonds between hydrogen and oxygen atoms don’t have a preferred orientation, unlike traditional hydrogen bonds.

The implications of this research are significant, as understanding the structure of supercritical water could help us better comprehend chemical processes in the vicinity of black smokers, where it occurs naturally. Additionally, its unique properties make it an attractive “green” solvent for chemical reactions, which is environmentally friendly and highly reactive.

Overall, this study provides a new molecular picture of the structural dynamics of water in the supercritical state, paving the way for further research into its potential applications and behavior.

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“Breaking Down Barriers: Groundbreaking Recycling Technique Turns ‘Forever Chemicals’ into Renewable Resources”

A new technique that uses soundwaves to separate materials for recycling could help prevent potentially harmful chemicals leaching into the environment.

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Breaking Down Barriers: Groundbreaking Recycling Technique Turns ‘Forever Chemicals’ into Renewable Resources

In a major breakthrough, researchers at the University of Leicester have developed a revolutionary technique to efficiently separate valuable catalyst materials and fluorinated polymer membranes (PFAS) from catalyst-coated membranes (CCMs). This achievement has significant implications for preventing potentially harmful chemicals from contaminating our environment.

PFAS, often referred to as “forever chemicals,” are known to contaminate drinking water and have serious health implications. The Royal Society of Chemistry has urged government intervention to reduce PFAS levels in UK water supplies.

Fuel cells and water electrolysers, essential components of hydrogen-powered energy systems, rely on CCMs containing precious platinum group metals. However, the strong adhesion between catalyst layers and PFAS membranes has made recycling difficult.

The researchers’ innovative method uses organic solvent soaking and water ultrasonication to effectively separate these materials, revolutionizing the recycling process. Dr. Jake Yang from the University of Leicester School of Chemistry comments, “This method is simple and scalable. We can now separate PFAS membranes from precious metals without harsh chemicals – revolutionizing how we recycle fuel cells.”

Building on this success, a follow-up study introduced a continuous delamination process using high-frequency ultrasound to split the membranes, accelerating recycling. The innovative process creates bubbles that collapse when subjected to high pressure, allowing the precious catalysts to be separated in seconds at room temperature.

This groundbreaking research was carried out in collaboration with Johnson Matthey, a global leader in sustainable technologies. Industry-academia partnerships like this underscore the importance of collective efforts in driving technological progress.

Ross Gordon, Principal Research Scientist at Johnson Matthey, says, “The development of high-intensity ultrasound to separate catalyst-loaded membranes is a game-changer in how we approach fuel cell recycling. At Johnson Matthey, we are proud to collaborate on pioneering solutions that accelerate the adoption of hydrogen-powered energy while making it more sustainable and economically viable.”

As fuel cell demand continues to grow, this breakthrough contributes to the circular economy by enabling efficient recycling of essential clean energy components. The researchers’ efforts support a greener and more affordable future for fuel cell technology while addressing pressing environmental challenges.

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Breakthrough in Fuel Cell Lifespan: Paving the Way for Clean Long-Haul Trucking

Researchers have developed a new catalyst design capable of pushing the projected fuel cell catalyst lifespans to 200,000 hours. The research marks a significant step toward the widespread adoption of fuel cell technology in heavy-duty vehicles, such as long-haul tractor trailers. While platinum-alloy catalysts have historically delivered superior chemical reactions, the alloying elements leach out over time, diminishing catalytic performance. The degradation is further accelerated by the demanding voltage cycles required to power heavy-duty vehicles. To address this challenge, the team has engineered a durable catalyst architecture with a novel design that shields platinum from the degradation typically observed in alloy systems.

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With a significant breakthrough in extending the lifespan of hydrogen fuel cells, researchers at UCLA have made a major step towards making clean, long-haul trucking a reality. Led by Professor Yu Huang, the team has developed a new catalyst design that can push projected fuel cell lifespans to 200,000 hours – nearly seven times the US Department of Energy’s target for 2050.

Hydrogen fuel cells have been considered a promising alternative to batteries for long-haul trucks due to their ability to be refueled as quickly as traditional gasoline. However, one major challenge has been the durability of the catalysts used in these systems. The new design, which embeds ultrafine platinum nanoparticles within protective graphene pockets, addresses this issue by preventing the leaching of alloying elements and maintaining high catalytic activity over time.

The implications of this breakthrough are significant. Heavy-duty trucks account for nearly a quarter of greenhouse gas automobile emissions, making them an ideal entry point for polymer electrolyte membrane fuel cell technology. By using hydrogen fuel cells in these vehicles, it’s possible to deliver the same performance as conventional batteries while being significantly lighter and requiring less energy to move.

The researchers’ innovative catalyst design holds great promise for the adoption of hydrogen-powered heavy-duty vehicles, which would be a crucial step towards reducing emissions and improving fuel efficiency in a sector that accounts for a substantial share of transportation energy use. The team’s findings build on their earlier success in developing a fuel cell catalyst for light-duty vehicles, demonstrating a lifespan of 15,000 hours.

The new study, published in Nature Nanotechnology, was led by UCLA Ph.D. graduates Zeyan Liu and Bosi Peng, both advised by Huang, whose research group specializes in developing nanoscale building blocks for complex materials, such as fuel cell catalysts. Xiaofeng Duan, a professor of chemistry and biochemistry at UCLA, and Xiaoqing Pan, a professor of materials science and engineering at UC Irvine, are also authors on the paper.

UCLA’s Technology Development Group has filed a patent on the technology, which has significant implications for the development of clean energy solutions in the transportation sector.

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Affordable Hydrogen Fuel Production on the Horizon: Researchers Unveil Breakthrough Strategy

Researchers found a strategy to create catalysts that make the production of hydrogen for clean fuel more efficient and affordable.

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The world is on the cusp of a revolution in hydrogen fuel production. Researchers at Tohoku University have made a groundbreaking discovery that could finally bridge the gap between laboratory experiments and large-scale commercial production. The breakthrough involves a surface reconstruction strategy that utilizes non-noble metal-based cathodes to accelerate the hydrogen evolution reaction (HER).

The HER is a crucial process for creating clean hydrogen fuel, which has the potential to alleviate our climate change crisis. However, scaling up this reaction from lab to factory has been a daunting challenge due to its inefficiency and slowness. The researchers’ findings, published in Advanced Energy Materials on April 3, 2025, offer a promising solution.

By examining transition metal phosphides (TMPs), the research team discovered that adding fluorine (F) to the CoP lattice allows for P-vacancy sites to form on the surface. This leads to an increase in active sites, which speed up the HER reaction. The resulting F modified CoP cathode demonstrated exceptional performance, maintaining approximately 76 W for over 300 hours.

“This is a significant advancement in HER catalyst research,” says Heng Liu from the Advanced Institute for Materials Research (WPI-AIMR). “Our calculated cost of using this method is just $2.17 per kgH2-1 – mere cents over the current production target set for 2026.”

The researchers’ experiment extended beyond lab-scale testing, applying their findings to commercial-scale PEM electrolyzers. This breakthrough has far-reaching implications for the rational design of non-noble metal-based cathodes.

“We’re always thinking about the end goal, which is for research to make its way into everyday life,” says Liu. “This advancement brings us one step closer to designing more realistic options for commercial PEM application.”

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