Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Researchers develop novel technique to convert thermoelectric material into high performance electricity

Pooja Puneet, Ph.D., the lead author on the article published in Scientific Reports and Prof. Jian He discuss their custom-made resistivity and Seebeck measurement system which is located in Prof. Terry Tritt’s complex advanced material laboratory.
Pooja Puneet, Ph.D., the lead author on the article published in Scientific Reports and Prof. Jian He discuss their custom-made resistivity and Seebeck measurement system which is located in Prof. Terry Tritt’s complex advanced material laboratory.

Abstract:
by Ramakrishna Podila

A team of Clemson University physicists consisting of nanomaterial scientists Apparao Rao and Ramakrishna Podila and thermoelectricians Terry Tritt, Jian He and Pooja Puneet worked synergistically through the newly established Clemson Nanomaterials Center to develop a novel technique of tailoring thermoelectric properties of n-type bismuth telluride for high thermoelectric performance.

Researchers develop novel technique to convert thermoelectric material into high performance electricity

Clemson, SC | Posted on November 19th, 2013

Their findings were published in journal Scientific Reports.

The current US energy economy and environment are increasingly threatened by fast-dwindling domestic reserves of fossil fuel coupled with severe environmental impact of fossil fuel combustion. Highly-efficient thermoelectric devices are expected to provide clean energy technology-needs of the hour for US energy sustainability. This research is a step towards optimizing the device performance since it outlines a methodology to overcome a challenge that has "frustrated" thermoelectric researchers to date.

Thermoelectric (TE) devices convert waste heat into electricity through a unique material's property called the Seebeck effect. Basically, the Seebeck effect results in a voltage across the two ends of a TE material, akin to the voltage present across the two ends of a AA battery, when the TE material is properly exposed to the waste heat. In such devices, the efficiency of converting heat into electricity is governed by certain strongly coupled materials properties, viz., electrical resistivity, Seebeck coefficient, and thermal conductivity. A functional TE device consists of multiple legs made up of p-type and n-type materials, just as a diode comprises of a p-n junction.

Bismuth telluride (Bi2Te3) is a layered material and can be viewed as a deck of playing cards, wherein each card is only a few atoms thick. Bi2Te3 is currently regarded as the state-of-the-art TE material with high efficiency for converting waste heat into electricity, and is therefore attractive for energy harvesting processes.

Traditional nanosizing methods failed to improve the performance of n-type Bi2Te3 since they simply downgrade all materials properties simultaneously. Therefore, Clemson researchers and colleagues developed a novel nanosizing method in which we first peel n-type Bi2Te3 into atomically thin-sheets (akin to graphene which is one atom thick sheet of carbon atoms) and reassemble them using a spark plasma sintering process.

The researchers found that that the above described two-step process of first separating the deck of cards into individual cards and then re-assembling them into a deck via spark plasma sintering does enable us to suitably tailor the materials properties of n-type Bi2Te3for high TE performance. In this approach, the so-called ‘interfacial charged defects' are generated in the sintered n-type Bi2Te3 which not only improves its structural properties but also its thermoelectric efficiency over a wide temperature window, thus making it extremely compatible with p-type Bi2Te3 for manufacturing efficient TE devices.

The improved compatibility factor (demonstrated in this paper) is expected to open new possibilities for highly efficient TE devices. The fascinating and noteworthy element of this research is that defects, which often connote impurity and are associated with low performance or efficiency, can indeed be used to tune the properties of materials to our advantage.

Today's scientific community lacks a comprehensive understanding of defects, mainly due to the absence of methods that can controllably generate and manipulate defects. The future of this research will be aimed at developing tools to generate and study defects at a fundamental level which will in turn allow the researchers to optimize materials properties of not only TE materials but also of a new class of two-dimensional materials beyond the Nobel-winning graphene for energy generation and storage.

####

For more information, please click here

Contacts:
Ramakrishna Podila

Copyright © Clemson University

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 Links

Link for further reading:

Related News Press

News and information

Iranian Scientists Use Artemisia Annua Plant to Produce Breast Cancer Drugs August 29th, 2015

Small but heading for the big time: Nanobiotix half year results for the six months ended 30 June 2015, in line with expectations: Major clinical achievements and corporate developments August 28th, 2015

A new technique to make drugs more soluble August 28th, 2015

Nanocatalysts improve processes for the petrochemical industry August 28th, 2015

Announcements

Iranian Scientists Use Artemisia Annua Plant to Produce Breast Cancer Drugs August 29th, 2015

Small but heading for the big time: Nanobiotix half year results for the six months ended 30 June 2015, in line with expectations: Major clinical achievements and corporate developments August 28th, 2015

A new technique to make drugs more soluble August 28th, 2015

Nanocatalysts improve processes for the petrochemical industry August 28th, 2015

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Iranian Scientists Use Artemisia Annua Plant to Produce Breast Cancer Drugs August 29th, 2015

A new technique to make drugs more soluble August 28th, 2015

CWRU researchers efficiently charge a lithium-ion battery with solar cell: Coupling with perovskite solar cell holds potential for cleaner cars and more August 27th, 2015

Successful boron-doping of graphene nanoribbon August 27th, 2015

Energy

Nanocatalysts improve processes for the petrochemical industry August 28th, 2015

Nanotechnology that will impact the Security & Defense sectors to be discussed at NanoSD2015 conference August 25th, 2015

Industrial Nanotech, Inc. Provides Update On Hospital Project, PCAOB Audit, and New Heat Shield™ Line August 24th, 2015

Novel nanostructures for efficient long-range energy transport August 21st, 2015

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage

CWRU researchers efficiently charge a lithium-ion battery with solar cell: Coupling with perovskite solar cell holds potential for cleaner cars and more August 27th, 2015

'Diamonds from the sky' approach turns CO2 into valuable products August 19th, 2015

Drexel engineers 'sandwich' atomic layers to make new materials for energy storage August 15th, 2015

Flexible, biodegradable device can generate power from touch (video) August 12th, 2015

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