A new study by Berkeley Lab researchers shows that nearly 90% of the electrons generated by a hybrid material designed to store solar energy in hydrogen are being stored in the target hydrogen molecules. Interfacing the semiconductor gallium phosphide with a cobaloxime catalyst provides an inexpensive photocathode for bionic leaves that produce energy-dense fuels from nothing more than sunlight, water and carbon dioxide.
Massachusetts Institute of Technology chemists have devised a way to trap carbon dioxide and transform it into useful organic compounds, using a simple metal complex. More work is needed to understand and optimize the reaction, but one day this approach could offer an easy and inexpensive way to recapture some of the carbon dioxide emitted by vehicles and power plants.
A key to realizing commercial-scale artificial photosynthesis technology is the development of electrocatalysts that can efficiently and economically carry out water oxidation reaction that is critical to the process. Heinz Frei, a chemist Lawrence Berkeley National Laboratory, has been at the forefront of this research effort. His latest results represent an important step forward.
A big step in the development of advanced fuel cells and water-alkali electrolyzers has been achieved with the discovery of a new class of bimetallic nanocatalysts that are an order of magnitude higher in activity than the target set by the U.S. Department of Energy for 2017. The new catalysts feature a 3-D catalytic surface activity that makes them significantly more efficient and far less expensive than the best platinum catalysts.
A pathway to more effective and efficient synthesis of pharmaceutical drugs and other flow reactor chemical products has been opened by a study in which, for the first time, the catalytic reactivity inside a microreactor was mapped in high resolution from start-to-finish. The results not only provided a better understanding of the chemistry behind the catalytic reactions, they also revealed opportunities for optimization.
The scarcity of ultraviolet (UV) light in sunlight has held back the usefulness of titanium dioxide-based photocatalysts. Through the application of nanotechnology, researchers in Japan have recently succeeded in the development of better titanium dioxide-based material that can be activated by visible light. The solution lies in an array of nanoparticles that “simulate” the photoexcitation of UV light.
A team of researchers at the Univ. of Delaware has developed a highly selective catalyst capable of electrochemically converting carbon dioxide to carbon monoxide with 92% efficiency. The carbon monoxide then can be used to develop useful chemicals. The exceptionally high activity of the new electrocatalyst is due to its extremely large and highly curved internal surface.
Researchers from two continents have engineered an efficient and environmentally friendly catalyst for the production of molecular hydrogen (H2), a compound used extensively in modern industry to manufacture fertilizer and refine crude oil into gasoline. The new method can product industrial quantities of hydrogen without emitting carbon into the atmosphere.
Researchers at North Carolina State Univ. have shown that a one-atom thick film of molybdenum sulfide (MoS2) may work as an effective catalyst for creating hydrogen. The work opens a new door for the production of cheap hydrogen. Hydrogen holds great promise as an energy source, but the production of hydrogen from water electrolysis currently relies in large part on the use of expensive platinum catalysts.
Solid catalysts based on precious metals, such as palladium, are widely used in industry to promote a range of chemical reactions. Finding ways to minimize the consumption of expensive catalytic materials, however, remains a critical challenge. Researchers in Japan have now developed a nanostructured catalyst that makes extremely efficient use of trace amounts of catalytic palladium.
Humans have for ages taken cues from nature to build their own devices, but duplicating the steps in the complicated electronic dance of photosynthesis remains one of the biggest challenges and opportunities for chemists. Currently, the most efficient methods we have for making fuel from sunlight and water involve rare and expensive metal catalysts. However, that is about to change.
Researchers at the U.S. Department of Energy’s Brookhaven National Laboratory report that, for the first time, a comprehensive set of tools is available for exploring correlations among the morphological, structural, electronic and chemical properties of catalytic materials under working conditions. Two recent studies have used microscopy and spectroscopy to catch custom-built catalysts in action.
By replacing platinum with molybdenum in photoelectrochemical cells, scientists from two Swiss labs have developed a cheaper and scalable technique that can greatly improve hydrogen production through water splitting as a means of storing solar energy.
Life science researchers regularly use transmission electron microscopy to study wet environments. Now, scientists at Pacific Northwest National Laboratory who are studying batteries have used the method to have applied it successfully to microscopically view electrodes while they are bathed in wet electrolytes, mimicking realistic conditions inside actual batteries.
Scientists from the Univ. of Houston have found a catalyst that can quickly generate hydrogen from water using sunlight, potentially creating a clean and renewable source of energy. Photocatalytic water-splitting experiments have been tried since the 1970s, but this is the first to use cobalt oxide and the first to use neutral water under visible light at a high energy conversion efficiency without co-catalysts or sacrificial chemicals.
Today’s fuel cells require costly platinum as a catalyst for the reaction that forms water from hydrogen and oxygen. A research team inspired by nature to develop an alternative catalyst has designed a material consisting of organic molecules as well as iron or manganese on a metallic substrate. These materials are less costly and more easily available than platinum.
Hydrogen is a “green” fuel that burns cleanly and can generate electricity via fuel cells. One way to sustainably produce hydrogen is by splitting water molecules using the renewable power of sunlight, but scientists are still learning how to control and optimize this reaction with catalysts. At the National Synchrotron Light Source, a research group has determined key structural information about a potential catalyst.
A chemical system developed by researchers at the Univ. of Illinois at Chicago can efficiently perform the first step in the process of creating syngas, gasoline and other energy-rich products out of carbon dioxide. A novel “co-catalyst” system using inexpensive, easy-to-fabricate carbon-based nanofiber materials efficiently converts carbon dioxide to carbon monoxide, a useful starting material for synthesizing fuels.
Chemical engineers at Rice Univ. have found a new catalyst that can rapidly break down nitrites, a common and harmful contaminant in drinking water that often results from overuse of agricultural fertilizers. Nitrites and their more abundant cousins, nitrates, are inorganic compounds that are often found in both groundwater and surface water. The compounds are a health hazard.
Converting solar energy into storable fuel remains one of the greatest challenges of modern chemistry. Chemists have commonly tried to use indium tin oxide (ITO) because it has transparency, but it also expensive and rare. Researchers at Duke Univ. has created something they hope can replace ITO: copper nanowires fused in a see-through film.
Scientists worldwide are seeking ways to improve the power density, durability and overall performance of lithium-ion (Li-ion) batteries. Researchers in Japan now report an advance in Li-ion battery technology that yields a significantly higher-performing battery. The difference is a cathode positive electrode of lithium cobalt oxide in which the compound's individual grains are aligned in a specific orientation.
Stanford Univ. researchers have developed an inexpensive device that uses light to split water into oxygen and clean-burning hydrogen. The goal is to supplement solar cells with hydrogen-powered fuel cells that can generate electricity when the sun isn't shining or demand is high.
Researchers at NJIT have developed a flexible battery made with carbon nanotubes that could potentially power electronic devices with flexible displays. According to its developers, this battery can be made as small as a pinhead or as large as a carpet in a living room.
Billions of euros are spent treating trillions of liters of wastewater every year, consuming substantial amounts of energy. However, this wastewater could act as a renewable resource, saving significant quantities of energy and money, as it contains organic pollutants which can be used to produce electricity, hydrogen and high-value chemicals, such as caustic soda.
By tuning gold nanoparticles to just the right size, researchers from Brown Univ. have developed a catalyst that selectively converts carbon dioxide to carbon monoxide, an active carbon molecule that can be used to make alternative fuels and commodity chemicals.