July 27, 2016,
Physics, Technology/Electronics, Chemistry/Nanotechnology
Structural comparison of penlandite with hydrogenases. (a) Crystal structure of Ni4.5Fe4.5S8. The nickel and iron sites (brown) share the same positions within the crystal and are bridged by sulfur (yellow). (b) Active site of the [FeNi]-hydrogenase (PDB: 4U9H) as well as (c) [FeFe]-hydrogenase (X=NH, PDB: 1HFE).
July 27, 2016,
Physics, Technology/Electronics, Chemistry/Nanotechnology
Mr. Zafer Hawash setting up the hanging mercury drop electrode system for conductivity measurement. Credit: Image courtesy of Okinawa Institute of Science and Technology Graduate University – OIST
Researchers have clarified the relationship between air exposure and enhanced electric proprieties in perovskite solar cells. Perovskite solar cells are the rising star in the photovoltaic landscape. Since their invention, <10 years ago, their efficiency has doubled twice and it is now over 22% – an astonishing result in the renewable energy sector. Taking the name ‘perovskite’ from the light-harvesting layer that characterizes them, these solar cells are lighter, cheaper, and more flexible than the traditional crystalline silicon-based cells.
Perovskite solar cells are usually exposed to ambient...
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July 25, 2016,
Technology/Electronics, Chemistry/Nanotechnology
In a new concept for battery cathodes, nanometer-scale particles made of lithium and oxygen compounds (depicted in red and white) are embedded in a sponge-like lattice (yellow) of cobalt oxide, which keeps them stable. The researchers propose that the material could be packaged in batteries that are very similar to conventional sealed batteries yet provide much more energy for their weight. Credit: Courtesy of the researchers
New chemistry could overcome key drawbacks of lithium-air batteries. Lithium-air batteries are considered highly promising technologies for electric cars and portable electronic devices because of their potential for delivering a high energy output in proportion to their weight...
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July 24, 2016,
Physics, Technology/Electronics
This image shows high-energy x-ray diffraction patterns of the reciprocal lattice plane (H?K?0). The CDW superstructure peaks are marked by blue arrows (logarithmic color scale). Credit: U.S. Department of Energy, Ames Laboratory
Researchers at DOE Ames Lab have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity. While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface. A charge density wave (CDW) is a state of matter where electrons bunch together in a repeating pattern, like a standing wave of surface of water. Superconductivity and charge density waves share a common origin, often co-exist, and can compete for dominance in certain materials.
Conventi...
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