Tag

Photocatalysis

All articles tagged with #photocatalysis

science-and-technology6 days ago•4 min saved

Oregon State Researchers Develop Sulfur-Based Material for Cheaper Green Hydrogen

A new light-activated material from Oregon State University can produce hydrogen from water without expensive metal catalysts. The material, BVR-19, uses a unique sulfur bond to drive the reaction efficiently. This approach could lower the cost of green hydrogen, which currently costs about $5 per kilogram compared to $1.50 for fossil-fuel-derived hydrogen. The findings, published in the Journal of the American Chemical Society, offer new design rules for solar fuel production.

via sciencedaily.com|

#hydrogen-production #metal-organic-frameworks #oregon-state-university

chemistry1 month ago•37 min saved

Single-Atom Copper Catalyst Enables Reusable, Light-Driven N-Demethylation

A recyclable, noble-metal-free photocatalyst composed of atomically dispersed Cu on functionalized graphitic carbon nitride (Cu@f-gC3N4) enables selective N-demethylation and N-dealkylation of a broad range of tertiary amines under 390 nm light in an O2 atmosphere. The reaction tolerates diverse substrates, including pharmaceutically relevant molecules, and can be scaled to 10 mmol with catalyst reuse exceeding ten cycles. Mechanistic studies (radical trapping, isotope labeling, in situ FTIR, EPR, XANES/EXAFS and DFT) support a photoredox pathway in which amine oxidation generates ammonium-like intermediates, O2 is reduced to superoxide to abstract a methyl hydrogen, forming an iminium that hydrolyzes to the secondary amine; the Cu single-atom sites and the functionalized g-C3N4 support drive charge separation and O2 activation, enabling practical late-stage amine diversification without sacrificial reagents.

via Nature|

#chemistry #copper #graphitic-carbon-nitride

technology6 months ago•4 min saved

Theory-guided design accelerates solar-fuel catalysts from polyheptazine imides

Researchers developed and validated a reproducible theory based on many-body perturbation theory to predict how different metal ions affect the structure, band gaps, and light absorption of polyheptazine imides, testing 53 ions and eight synthesized materials; the results, confirmed by measurements of hydrogen peroxide production, enable faster, targeted design of solar-to-chemical catalysts for water splitting and CO2 reduction.

via ScienceDaily|

#carbon-nitride #many-body-perturbation-theory #materials-design

science9 months ago•4 min saved

Stored Sunlight Powers Hydrogen Production in Darkness

Researchers have developed a simple, cost-effective liquid system using common materials to store solar energy as electrons and later convert it into hydrogen gas in darkness, potentially revolutionizing renewable energy transport and storage without the need for electrical infrastructure.

via Interesting Engineering|

#hydrogen-production #liquid-energy-storage #photocatalysis

science1 year ago•2 min saved

Innovative Photocatalytic Method for Oxygen-Atom Exchange in Oxetanes and Saturated Rings

Researchers developed a photocatalytic method to replace oxygen in oxetanes with nitrogen, sulfur, or carbon, creating diverse cyclic compounds efficiently, which could simplify drug synthesis and modification.

via Nature|

#atom-transmutation #cyclic-molecules #drug-synthesis

technology1 year ago•5 min saved

Japan's Breakthrough in Solar Fuel Production Using CO2 and Sunlight

Japanese researchers have made a breakthrough in producing clean fuel from sunlight by redesigning catalysts with increased surface area and using microwave-assisted synthesis, potentially revolutionizing sustainable energy production and reducing reliance on fossil fuels.

via Energy Reporters|

#clean-energy #innovation #japan

science-and-technology1 year ago•3 min saved

Revolutionary Solar Tech Converts Water to Hydrogen Fuel

Scientists in Japan have developed a prototype reactor that uses photocatalytic sheets to split water molecules, producing hydrogen fuel from sunlight and water. This proof-of-concept technology, while still inefficient for commercial use, shows promise for creating sustainable hydrogen fuel if more efficient photocatalysts can be developed. The reactor's efficiency is currently low, but researchers are hopeful that advancements in photocatalyst materials and larger reactors could lead to practical applications, potentially transforming solar energy conversion and infrastructure.

via Livescience.com|

#hydrogenfuel #japan #photocatalysis

science-and-technology1 year ago•2 min saved

Revolutionary Solar Tech Converts Water to Green Hydrogen Fuel

Researchers have developed a new solar hydrogen production technology by creating a supramolecular fluorophore nanocomposite that mimics natural photosynthesis. This system uses tannic acid-based metal-polyphenol polymers to enhance the stability and efficiency of photocatalytic reactions, achieving a hydrogen production rate 5.6 times higher than previous methods. The technology combines modified rhodamine dyes with bacteria to convert sunlight and ascorbic acid into hydrogen, offering a sustainable energy solution.

via Phys.org|

#artificial-photosynthesis #hydrogen-production #nanotechnology

science-and-technology2 years ago•3 min saved

"Revolutionary Research Unlocks CO₂ Conversion into Sustainable Fuel"

Researchers have developed a material consisting of copper anchored on nanocrystalline carbon nitride, which, when exposed to sunlight, can efficiently convert CO2 into methanol, a green fuel. This breakthrough paves the way for creating sustainable fuels and reducing the impact of carbon dioxide, the primary contributor to global warming. The new catalyst, made of abundant elements like carbon, nitrogen, and copper, demonstrates high efficiency and selectivity, offering a promising pathway for the development of highly tunable catalysts at the nanoscale for CO2 conversion.

via Tech Xplore|

#co2 #methanol #photocatalysis

environment-science2 years ago•2 min saved

Revolutionary Recycling Method Eliminates Polyethylene Waste

Researchers at the University of Adelaide have developed a method to convert polyethylene waste into valuable chemicals using light-driven photocatalysis and solar energy, offering a sustainable solution to plastic pollution and contributing to a circular economy. The process upcycles polyethylene plastic waste into ethylene and propionic acid with high selectivity using atomically dispersed metal catalysts, harnessing renewable solar energy and addressing contemporary environmental and energy challenges. This innovative approach could revolutionize waste management and chemical manufacturing while reducing plastic pollution.

via SciTechDaily|

#circular-economy #environment-science #photocatalysis

science-and-technology2 years ago•3 min saved

"Titanium Dioxide: Pioneering Green Chemical Synthesis"

Researchers have developed an eco-friendly method for synthesizing heterocyclic thiochromenopyrroledione derivatives using titanium dioxide as a photocatalyst under blue light. This innovative approach, led by Professor Yutaka Hitomi, offers a more sustainable and less resource-intensive alternative to traditional high-temperature, high-pressure synthesis methods, potentially revolutionizing the chemical and pharmaceutical industries by enabling accessible and affordable production of important organic compounds.

via Phys.org|

##chemicalsynthesis #ecofriendly

science-and-technology2 years ago•4 min saved

"Maximizing Solar Energy Output with 2D Supercrystals"

Researchers at LMU's Nano-Institute have developed a two-dimensional supercrystal that generates hydrogen from formic acid using sunlight. The supercrystal, made of gold and platinum nanoparticles, concentrates solar energy and enhances light absorption, resulting in highly localized and strong electric fields. By placing platinum nanoparticles in the hotspots between the gold particles, the researchers achieved a hydrogen production rate of 139 millimoles per hour and per gram of catalyst, setting a world record for H2 production with sunlight. This material solution offers potential for other reactions and could contribute to greener hydrogen production and the conversion of CO2 into usable substances.

via Phys.org|

#energy-transition #hydrogen-production #nanotechnology

science-and-technology2 years ago•3 min saved

Revolutionary Breakthrough: Acetone Extraction Made Affordable, Safer, and Easier

Scientists from Brazil and Germany have developed a safer and more economical method for producing acetone, a key component in the chemical industry. The new process uses light and a photoactive iron chloride catalyst, eliminating the need for high-temperature and high-pressure steps. This innovation simplifies acetone production, enhances safety, and reduces costs. The researchers plan to scale up the process for industrial use and are seeking partnerships with companies. The method also has the potential to be used with other substances and can be further optimized for sustainable production.

via SciTechDaily|

#acetone #catalyst #chemical-industry

science3 years ago•0 min saved

"Revolutionary Breakthrough: Chemists Unveil Game-Changing Method to Effortlessly Split Water for Hydrogen Production"

German chemists from Münster University have developed a new photocatalytic method to split water using light energy, simplifying the production of hydrogen. This breakthrough could have significant implications for various fields, including chemistry and the synthesis of compounds from simpler materials.

via Interesting Engineering|

#chemistry #hydrogen-production #munster-university

science-and-technology3 years ago•2 min saved

Revolutionary Water Splitting Method Simplifies Hydrogen Production

German chemists have discovered a new process of water splitting that allows for easier production of hydrogen. The breakthrough method involves a photocatalytic process using triaryl phosphines, which activate water in a reaction accelerated by light energy. This discovery could lead to advancements in chemistry, including the synthesis of compounds using hydrogen atoms. The ease of hydrogen production is significant as it is considered a potential energy solution for the future and plays an active role in the formation of essential compounds. The research findings open up possibilities for applications in material sciences, agriculture, and pharmaceutical research.

via The Debrief|

#chemistry #hydrogen-production #photocatalysis