Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Thermoelectrics go nano

Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. Credit 2010 American Chemical Society.
Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. Credit 2010 American Chemical Society.

Abstract:
Recently, researchers from Boston College and MIT used nanotechnology to achieve a dramatic improvement in the thermoelectric performance of p-type half-Heuslers.

Thermoelectrics go nano

Chestnut Hill, MA | Posted on January 19th, 2011

Combined with the high temperature stability and abundance of this material, their work could make half-Heuslers good candidates for waste heat recovery in automotive exhaust systems, in which the waste heat of the exhaust is transformed back into electricity by thermoelectric modules, thus improving mileage.

Xiao Yan and his co-workers from BC and MIT achieved a 60-90% higher thermoelectric figure of merit (ZT - see 1 below) in nanostructured bulk samples in comparison with state-of-the-art ingot; specifically, peak ZT enhancements from 0.5 to 0.8 at 700 oC. The improvement mainly comes from the lower thermal conductivity and partially from the higher Seebeck coefficient. "It is the best scenario for a thermoelectric material. Think about it: you are enhancing the electronic transport properties while simultaneously hindering the passage of heat flow," said MIT professor Gang Chen.

A low-cost method was employed by Xiao Yan and his colleagues from BC and MIT, first forming bulk alloyed ingots by arc melting and then milling the material into a fine powder and finally hot-pressing the powder into nanocrystalline ingots. The average grain size of 100-200 nm is the smallest obtained in half-Heusler system to date. "This method is low cost and can be scaled for mass production. This represents an exciting opportunity to improve the thermoelectric performance of materials in a cost-effective manner," said Boston College professor Zhifeng Ren.

This work was published in Nano Letters pubs.acs.org/doi/abs/10.1021/nl104138t

Also contributing to the work were Prof. S. J. Poon from University of Virginia and Prof. T. M. Tritt from Clemson University.

(1) ZT is a measure of the thermoelectric performance of a material.

####

Contacts:
Ed Hayward
Boston College Office of Public Affairs
617-552-4826

Copyright © Boston College

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nanoparticles present sustainable way to grow food crops May 1st, 2016

Searching for a nanotech self-organizing principle May 1st, 2016

Clay nanotube-biopolymer composite scaffolds for tissue engineering May 1st, 2016

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Possible Futures

Clay nanotube-biopolymer composite scaffolds for tissue engineering May 1st, 2016

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Personal cooling units on the horizon April 29th, 2016

Exploring phosphorene, a promising new material April 29th, 2016

Announcements

Nanoparticles present sustainable way to grow food crops May 1st, 2016

Clay nanotube-biopolymer composite scaffolds for tissue engineering May 1st, 2016

Cooling graphene-based film close to pilot-scale production April 30th, 2016

Personal cooling units on the horizon April 29th, 2016

Energy

Nanoparticles present sustainable way to grow food crops May 1st, 2016

NREL finds nanotube semiconductors well-suited for PV systems April 27th, 2016

Researchers create artificial protein to control assembly of buckyballs April 27th, 2016

Flipping a chemical switch helps perovskite solar cells beat the heat April 26th, 2016

Automotive/Transportation

New spin Seebeck thermoelectric device with higher conversion efficiency created April 26th, 2016

All powered up: UCI chemists create battery technology with off-the-charts charging capacity April 21st, 2016

Ruthenium nanoframes open the doors to better catalysts April 4th, 2016

Heat and light get larger at the nanoscale: Columbia-led research team first to demonstrate a strong, non-contact heat transfer channel using light with performances that could lead to high efficiency electricity generation April 2nd, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic