Thermoelectric materials produce electricity by taking advantage of temperature differences on opposite sides of a material. They are currently being used in deep space satellites and camp coolers. But until now, scientists have not had a rational basis for combining different elements to produce these energy-producing materials.
The project developed by the Duke engineers covers thousands of compounds, and provides detailed "recipes" for creating most efficient combinations for a particular purpose, much like hardware stores mix different colors to achieve a particular tint of paint. The database is free and open to all (aflowlib.org).
"We have calculated the thermoelectric properties of more than 2,500 compounds and have calculated all their energy potentials in order to come up with the best candidates for combining them in the most efficient ways," said Stefano Curtarolo, associate professor of mechanical engineering and materials sciences and physics at Duke's Pratt School of Engineering. "Scientists will now have a more rational basis when they decide which elements to combine for their thermoelectric devices."
The results of the Duke team's work were published online in the journal Physics Review X.
A thermoelectric device takes advantage of temperature differences on opposite sides of a material – the greater the temperature difference, the greater energy potential.
Thermoelectric devices are currently used, for example, to provide power for deep-space satellites. The side of the device facing the sun absorbs heat, while the underside of the device remains extremely cold. The satellite uses this temperature difference to produce electricity to power the craft.
Different material combinations may be a more efficient method of turning these temperature differences into power, according to Shidong Wang, a post-doctoral fellow in Curtarolo's lab and first author of the paper.
Thermoelectric materials can be created by combining powdered forms of different elements under high temperatures – a process known as sintering. Not only does the new program provide the recipes, but it does so for the extremely small versions of the particular elements, known as nanoparticles. Because of their miniscule size and higher surface areas, nanoparticles have properties unlike their bulk counterparts.
"Having this repository could change the way we produce thermoelectric materials," Wang said. "With the current trial-and-error method, we may not be obtaining the most efficient combinations of materials. Now we have a theoretical background, or set of rules, for many of the combinations we now have. The approach can be used to tackle many other clean energy related problems."
The Duke researchers believe that the use of thermoelectric devices – which the new database should help fuel – could prove especially effective in cooling microdevices, such as laptop computers.
Wang and Curtarolo made use of data collected by the aflowlib.org consortium, a cloud-distributed repository for materials genomics. It currently comprises electronic structures, magnetic and thermodynamic characterization of inorganic compounds. The project, started by Duke scientists, is sponsored by the Office of Naval Research, the National Science Foundation and the U.S. Department of Homeland Security.
Duke's Wahyu Setyman, as well as Zhao Wang and Natalio Mingo of France's Atomic Energy and Alternative Energies Commission, were also part of the research team.
Richard Merritt | EurekAlert!
From rocks in Colorado, evidence of a 'chaotic solar system'
23.02.2017 | University of Wisconsin-Madison
Prediction: More gas-giants will be found orbiting Sun-like stars
22.02.2017 | Carnegie Institution for Science
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News