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Category: energy – Page 12

A new quantum dot photoreductant uses 99% less light energy for organic reactions

Chemists at the School of Science of the Hong Kong University of Science and Technology (HKUST) have recently made significant progress in photocatalysis by unveiling a “super” photoreductant, marking a major advancement in organic synthesis.

Quantum dots (QDs) hold great promise as photocatalysts for promoting photoredox chemistry. However, their application in photocatalytic organic transformations has lagged behind that of small molecule photosensitizers due to the limited understanding of their photophysics.

While various studies have explored the generation of hot electrons from QDs as a strategy to enhance photoreduction efficiencies, achieving effective hot-electron generation under has posed a significant challenge.

Tough fuel cell can stabilize power grid by making and storing energy in extreme industrial conditions

To build a modern-day electrical grid with the flexibility and resilience to handle ebbing and flowing energy sources like solar and wind power, West Virginia University engineers have designed and successfully tested a fuel cell that can switch between storing or making electricity and also generate hydrogen from water.

The hidden mechanics of abrupt transitions: Superconducting networks show how tiny changes trigger system collapse

Why do some changes in nature unfold gradually, while others occur in the blink of an eye? Rust forming on metal is a slow, steady process that takes days or even weeks to become visible. By contrast, a power grid can collapse in mere seconds. What accounts for this difference?

A research team at Bar-Ilan University has uncovered a surprising mechanism behind these abrupt transitions, a hidden spontaneous sequence of micro-scale events that gradually destabilize a system until it snaps. Their discovery sheds new light on how behave near critical tipping points and offers a new way to anticipate and perhaps even prevent catastrophic failure.

In their study just published in Nature Communications, the team led by Professors Shlomo Havlin and Aviad Frydman—alongside BIU researchers Ira Volotsenko, Yuval Sallem, and Nahala Yadid, and postdoctoral collaborators Bnaya Gross (Northeastern University) and Ivan Bonamassa (CEU Vienna)—investigated a novel engineered experimental system: interdependent superconducting networks.

Entropy engineering opens new avenue for robust quantum anomalous Hall effect in 2D magnets

A research team from the University of Wollongong’s (UOW) Institute for Superconducting and Electronic Materials (ISEM) has addressed a 40-year-old quantum puzzle, unlocking a new pathway to creating next-generation electronic devices that operate without losing energy or wasting electricity.

Published in Advanced Materials, the study is the work of UOW researchers led by Distinguished Professor Xiaolin Wang and Dr. M Nadeem, with Ph.D. candidate Syeda Amina Shabbir and Dr. Frank Fei Yun.

It introduces a new design concept to realize the elusive and highly sought-after quantum anomalous Hall (QAH) effect.

New component reduces cost, supply chain constraints for fast-charging EV batteries

Strengthening the competitiveness of the American transportation industry relies on developing domestically produced electric vehicle batteries that enable rapid charging and long-range performance. The energy density needed to extend driving distance can, however, come at the expense of charging rates and battery life.

By integrating a new type of current collector, which is a key battery component, researchers at the Department of Energy’s Oak Ridge National Laboratory have demonstrated how to manufacture a battery with both superior energy density and a lasting ability to handle extreme fast charging. This enables restoring at least 80% of battery energy in 10 minutes. By using less metal, particularly high-demand copper, the technology also relieves strain on U.S. supply chains.

“This provides a significant savings on near-critical materials, because much less copper and aluminum are needed,” said lead researcher Georgios Polyzos. “At the same time, this will greatly enhance the energy density achievable with a 10-minute charge.”

N2 sleep promotes the occurrence of ‘aha’ moments in a perceptual insight task

Sleep supports memory consolidation, but can it also facilitate memory reorganization? This study reveals that N2 sleep, but not N1 sleep during a nap, increases the likelihood of having an ‘aha’ moment about a previous decision-making task, and that spectral slopes of EEG power spectra predict future insights.

New method stores high-density methane in graphene-coated nanoporous carbon

Methane (CH4), one of the most abundant natural gases on Earth, is still widely used to power several buildings and to fuel some types of vehicles. Despite its widespread use, storing and transporting this gas safely remains challenging, as it is highly flammable and requires compression at high pressures of around 25 megapascals (MPa).

Most existing solutions to store CH4 at high pressures rely on expensive equipment and infrastructure, such as reinforced tanks, specialized valves and advanced safety systems. In addition, damage to this equipment or its malfunction that prompts leakage of gas can lead to explosions, fires and other serious accidents.

Some researchers have thus been trying to devise alternative strategies to store and transport CH4 that are both safer and more cost-effective. One of these recently proposed methods, known as absorbed natural gas (ANG), entails the use of nanoporous materials, containing tiny pores in which gas molecules could be trapped at moderate pressures.

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