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New Thermoelectric Material

Page history last edited by PBworks 15 years, 8 months ago

THERMOELECTRIC MATERIAL CONVERTS COMBUSTION

 

Scientists have invented a new material that converts the heat wasted

from combustion engines in vehicles, power stations and heat pumps.

 

The thermoelectric new material turns heat into energy without any

carbon emissions.

 

With up to 60 percent of a gasoline engine's energy lost through waste

heat, the thermoelectric device using lead telluride runs with no

moving parts.

 

Joseph Heremans of Ohio State University has heralded a bright future

for thermoelectric nanotechnology stating that lead telluride has

twice the efficiency of anything currently available.

 

The lead telluride creates electric power like a conventional heat

engine coupled to an electric generator, but uses electrons as the

working fluid instead of water or gas

 

The material is most effective between 450 and 950? Fahrenheit, which

is the typical temperature range for many power systems, including car

engines.

 

Know as thallium-doped lead telluride, the anti- pollution material is

twice as efficient as the second most efficient material used in

thermoelectric power.

 

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posted to ClimateConcern

 

Further details

 

Joseph Heremans

Professor

 

 

Ph.D., Catholic University of Louvain, Belgium (1978)

 

 

Room E443

201 W. 19th Ave.

Columbus, OH 43210

 

614-247-8869

 

Email: heremans.1

 

Thrust Area(s): Energy, Fluid, and Thermal Systems

 

 

Research

 

Dr. Heremans' research is focused on thermal transport properties of solids and nanostructures, aimed at developing thermoelectric materials with improved efficiency for both electrical power generation and heat pumping applications. A decade of research in his group and others has led to improved efficiencies through a reduction of the thermal conductivity by adding nanostructrues to thermoelectric materials. In contrast, since 2005, he has focused on developing bulk thermoelectric materials in which the increased efficiency is based on the details of the chemical bonds at sub-nanometer levels. One approach maximizes the anharmonicity of the bonds between atoms to reduce the thermal conductivity, and is published in Phys. Rev. Lett. 101, 035901 (2008). A second approach increases the thermoelectric power by using a resonance between the electronic states of Tl atoms and the valence band of PbTe (Science 321 554, 2008).

 

 

Selected Publications

 

Joseph P. Heremans, Vladimir Jovovic, Eric S. Toberer, Ali Saramat, Ken Kurosaki, Anek Charoenphakdee, Shinsuke Yamanaka, and G. Jeffrey Snyder, "Enhancement of Thermoelectric Efficiency in PbTe by Distortion of the Electronic Density of States," Science, vol. 321, no. 5888, pp. 554-557 (2008).

D. T. Morelli, V. Jovovic and J. P. Heremans, Intrinsically minimal thermal conductivity in cubic I-V-VI2 semiconductors, Phys. Rev. Lett. 101, 035901 (2008)

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