Researchers utilizing intense x-ray beams from the U.S. Department of Energy’s Advanced Photon Source (APS) examined the flow of electricity through semiconductors and uncovered another reason these materials seem to lose their ability to carry a charge as they become more densely “doped.” Their results, which may help engineers design faster semiconductors in the future, were published online in the journal ACS Nano.

New composite materials based on selenium (Se) sulfides that act as the positive electrode in a rechargeable lithium-ion (Li-ion) battery could boost the range of electric vehicles by up to five times, according to groundbreaking research carried out at the U.S. Department of Energy’s Advanced Photon Source at Argonne National Laboratory. The studies of the materials demonstrated that they have the potential to pack five times the energy density of conventional batteries.

Highly intense x-ray beams and a clever experimental setup allowed researchers to watch a high-pressure, high-temperature chemical reaction to determine for the first time what controls formation of two different nanoscale crystalline structures in the metal cobalt. The technique, employed at two U.S. Department of Energy x-ray light sources, including the Advanced Photon Source, allowed continuous study of cobalt nanoparticles as they grew from clusters including 10s of atoms, to crystals as large as 5 nanometers. The research provides the proof-of-principle for a new technique to study crystal formation in real time, with potential applications for other materials, including alloys and oxides.

The rechargeable lithium-ion batteries in our smartphones, laptops, and various other personal electronic devices make them completely portable, allowing us to unplug so long as the batteries are charged. But rechargeable batteries don't last forever, and the more times they're recharged, the less energy they store.

Tiny, disordered particles of magnesium chromium oxide may hold the key to new magnesium battery energy storage technology, which could possess increased capacity compared to conventional lithium-ion batteries, find researchers who studied the material utilizing ultra-bright x-ray beams from the U.S. Department of Energy’s Advanced Photon Source.

A novel gold compound with an “extra” electron compared to its chemical cousins is predicted to be a 3D Dirac semimetal, a relatively new class of electronic materials in which electrons behave as though they are massless, leading to high mobilities and unusual physics. The discovery, made at the U.S. Department of Energy’s Advanced Photon Source (APS), expands the search for possible thermoelectric materials (which make up Peltier coolers and thermoelectric generators) to include compounds with gold-gold bonds that stabilize "abnormal" electron counts. Such materials have very fast-moving electrons that could be used in circuits. Alternatively, these semimetals may have applications for solid-state cooling or heating.

Just as fishing experts know that casting a line in the right spot hooks the big catch, scientists from the U.S. Department of Energy Office of Science's (DOE-SC's) Ames Laboratory used an algorithm they developed, and the high-brightness x-ray beams from the DOE-SC's Argonne National Laboratory Advanced Photon Source to hone in on just the right spot for discovering a new family of rare-earth quasicrystals.

As the world moves away from incandescent light bulbs, light-emitting diodes (LEDs) are growing in popularity. They use significantly less energy and have far longer lifetimes than do the traditional incandescent bulbs, which are being phased out, and they don't contain mercury, as do compact fluorescents. LEDs do have a drawback, however. The phosphors that convert the single color produced by an LED into white light tend to produce a cool, bluish glow instead of the warmer, yellower color most people prefer.

Chemical warfare agents that could be deployed against both soldiers and civilians have been a grave concern since World War I, when they were first used. Research on methods to defeat these weapons has been a focus of scientists since that time. Now, a multi-institution collaboration of scientists from U.S. federal research institutions and U.S. universities is studying how the use of zirconium (Zr)-based metal organic frameworks (MOFs) and niobium (Nb)-based polyoxometalates (POMs) may be effectively used in gas masks to capture and decompose dangerous chemical agents like Sarin, notably used in a subway terrorist attack in Japan in 1995.

Metal-organic frameworks (MOFs) are handy crystalline constructs that combine metallic ions with organic molecules to form a structure featuring molecular “cages” or channels that can trap other atoms or molecules to filter, store, or otherwise separate them from the surrounding environment. One common potential use for MOFs is in catalysis, but the immobilization of enzymes is challenging because of leaching and aggregation that can decrease catalytic efficiency. With the help of structural studies performed at the U.S. Department of Energy’s Advanced Photon Source (APS), a group of experimenters has devised several new MOFs designed to encapsulate enzymes with high catalytic efficiency and recyclability. Their work was published in Nature Communications.

Carbon monoxide (CO) is an insidious poison because it loves the iron in our blood; it pushes oxygen out of iron-based hemoglobin, leading to painful asphyxiation. This affinity for iron comes in handy in a newly created material that can absorb carbon monoxide far better than other materials, with potential applications in industrial processes like syngas production, where CO is a key player, and reactions where CO is an unwanted contaminant. A number of characterization and measurement techniques contributed to this groundbreaking research, including critical experiments at the U.S. Department of Energy’s Advanced Photon Source.

Carbon monoxide (CO) is an insidious poison because it loves the iron in our blood; it pushes oxygen out of iron-based hemoglobin, leading to painful asphyxiation. This affinity for iron comes in handy in a newly created material that can absorb carbon monoxide far better than other materials, with potential applications in industrial processes like syngas production, where CO is a key player, and reactions where CO is an unwanted contaminant. A number of characterization and measurement techniques contributed to this groundbreaking research, including critical experiments at the U.S. Department of Energy’s Advanced Photon Source.

Metal oxides such as titanium dioxide (TiO2) are fascinating and versatile substances that can be used in many applications, including photovoltaic devices, batteries, and other vital technologies. But the utility of a particular material for a particular purpose may be limited, and common techniques to chemically "fine tune" their properties to fit specific parameters, such as doping or surface coating, are not always practical or effective. A group of researchers from a diverse set of institutions decided to try a different strategy by cross-linking metal oxide molecules with boron to create clusters of hybrid networks with new chemical and electrical properties and then characterizing the material at the U.S. Department of Energy’s Advanced Photon Source. Their work, which was published in Nature Materials, opens possibilities for the precise tailoring of such materials for specific purposes.

A step towards new, "beyond lithium" rechargeable batteries with superior performance has been made by a multi-institution, international collaboration of scientists who used a variety of research techniques and facilities including the U.S. Department of Energy’s Advanced Photon Source (APS) at Argonne National Laboratory. The research was published in the journal Nature Materials.

Even as our electronic devices become ever more sophisticated and versatile, battery technology remains a stubborn bottleneck, preventing the full realization of promising applications such as electric vehicles and power-grid solar energy storage. Among the limitations of current materials are poor ionic and electron transport qualities. While strategies exist to improve these properties, and hence reduce charging times and enhance storage capacity, they are often expensive, difficult to implement on a large scale, and of only limited effectiveness. An alternative solution is the search for new materials with the desired atomic structures and characteristics. This is the strategy of a group of researchers who, utilizing ultra-bright x-rays from the U.S. Department of Energy’s Advanced Photon Source, identified and characterized two niobium tungsten oxide materials that demonstrate much faster charging rates and power output than conventional lithium electrodes.

Most of us don’t think about our teeth and bones until one aches or breaks. A team of engineers at Washington University in St. Louis utilized the U.S. Department of Energy’s Advanced Photon Source to look deep within collagen fibers to see how the body forms new bone and teeth, seeking insights into faster bone healing and new biomaterials.

Humans can learn a lot from plants. With energy from the sun, protein catalysts in plants efficiently split water to generate oxygen, storing the energy as carbohydrates. Scientists would like to perform a similar trick, using solar energy to split water and produce hydrogen fuel. Hydrogen fuel burns clean, producing only water as a byproduct, but splitting water is not an efficient task for humans. Researchers have taken baby steps toward artificial photosynthesis, building solar-powered water-splitting catalysts in the laboratory, but so far these catalysts remain far less efficient than their vegetal counterparts. One reason it's difficult to improve catalytic efficiency is that scientists don't fully understand the catalysts’ water-splitting mechanism.

Portland cement concrete is all around us, in the sidewalks we walk on, the buildings we live and work in, and the roads our vehicles ride on. One of the most versatile and useful building materials ever created, it is so commonplace that we hardly ever think of it (unless we happen to trip and scrape our knees on it). Yet surprisingly, although we worry about carbon emissions from cars, airplanes, and power plants, this everyday, seemingly innocent material is also a hidden and largely ignored global warming culprit.

New research offers the first complete picture of why a promising approach of stuffing more lithium into battery cathodes leads to their failure. A better understanding of this could be the key to smaller phone batteries and electric cars that drive farther between charges.

Nuclear power is one of the best ways currently available to supply clean, baseload electric power to the U.S. over the long term. But reserves of good uranium ore to fuel those plants are diminishing. By 2100 there will not be enough recoverable uranium left in terrestrial mines to meet the demands of existing power plants. However, if we cannot mine uranium on land, we may be able to sift it from the sea: The oceans contain huge reserves of uranium dissolved in seawater. State-of-the-art polymer fabrics soaked in seawater can recover 7 to 8 grams of uranium over a span of 30 days.

Thin films are ubiquitous in computer chips and other electronic devices. Researchers have recently begun tuning the properties of these films by growing them on substrates with different crystal structures. A particularly interesting case is the lanthanum-cobalt oxide, LaCoO3, or LCO for short. As a bulk crystal, LCO is not magnetic, but thin films of LCO grown on certain substrates exhibit ferromagnetic ordering. Previous attempts to explain this induced magnetism have been unable to incorporate the fact that the atomic arrangement, or crystal symmetry, of epitaxial LCO film is distinct from that of both its bulk phase and its substrates. This symmetry mismatch leads to additional structural distortions in LCO thin films, as observed in x-ray experiments performed at the U.S. Department of Energy’s Advanced Photon Source (APS) and elsewhere.

As the techniques of additive manufacturing (AM), more popularly known as “3-D printing,” become ever more versatile and applicable for diverse purposes, they sometimes pose unique challenges that are not present with more traditional manufacturing methods. In additive-manufactured metals and alloys, such problems can result in microstructural defects that lead to reduced strength and stress resistance, an issue commonly addressed by post-build heat treatment. But this approach can also have undesirable side effects. Researchers from the National Institute of Standards and Technology used the U.S. Department of Energy’s Advanced Photon Source to examine the AM alloy Inconel 625 (IN625) in an effort to better understand the effects of heat treatment on AM alloy microstructure and phase evolution.

Inexpensive materials called MOFs, for metal-organic frameworks, pull gases out of air or other mixed gas streams, but fail to do so with oxygen. Now, a team that includes researchers from two U.S. Department of Energy (DOE) national laboratories has overcome this limitation by creating a composite of a MOF and a helper molecule in which the two work in concert to separate oxygen from other gases simply and cheaply. The results, achieved with an assist from the DOE’s Advanced Photon Source (APS) at Argonne, might help with a wide variety of applications, including making pure oxygen for fuel cells, using that oxygen in a fuel cell, removing oxygen in food packaging, making oxygen sensors, or for other industrial processes. The technique might also be used with gases other than oxygen as well by switching out the helper molecule.

Chemically the same, graphite and diamonds are as physically distinct as two minerals can be, one opaque and soft, the other translucent and hard. What makes them unique is their differing arrangement of carbon atoms. Polymorphs, or materials with the same composition but different structures, are common in bulk materials. Now a new study in Nature Communications that describes results from studies at synchrotron x-ray light sources, including two U.S. Department of Energy user research facilities, confirms they exist in nanomaterials, too.

Of the many amino acids essential for life, glycine has both the fewest number of atoms and the greatest known number of polymorphs (unique structural forms). Although scientists have long recognized that glycine displays multiple polymorphs, the exact structure of several of these forms has remained a mystery. Now a research team has uncovered the precise molecular arrangement of one of these mysterious structural phases, which they have dubbed glycine dihydrate, or GDH. The researchers deduced the structure of GDH by applying computational analysis to powder x-ray diffraction measurements collected at the U.S. Department of Energy’s Advanced Photon Source (APS) at Argonne National Laboratory.

In a new study, researchers from the Cambridge Crystallographic Data Centre (CCDC) and the U.S. Department of Energy’s (DOE’s) Argonne National Laboratory have teamed up to capture neon within a porous crystalline framework. Neon is well known for being the most unreactive element and is a key component in semiconductor manufacturing, but this is the first time neon has ever been studied within an organic or metal-organic framework. The results, which include critical studies at the Advanced Photon Source (APS), a DOE Office of Science user facility at Argonne, also point the way towards a more economical and greener industrial process for neon production.

Work by a team of researchers from Oak Ridge National Laboratory (ORNL) and The University of Chicago shows that the polymeric adsorbent materials that bind uranium behave nothing like scientists had believed. The results, detailed in a paper published in Energy & Environmental Science, highlight data made possible with x-ray absorption fine structure spectroscopy performed at the Materials Research Collaborative Access Team beamline 10-BM-B at the U.S. Department of Energy’s Advanced Photon Source (APS), as well as pair distribution function data collected at the X-ray Science Division beamline 11-ID-B, also at the APS, which is an Office of Science User Facility at Argonne National Laboratory.