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Chemical Approaches for Hetero-struc...

Zhang, Yichi.

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Chemical Approaches for Hetero-structured Thermoelectric Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Chemical Approaches for Hetero-structured Thermoelectric Materials./
作者:	Zhang, Yichi.
面頁冊數:	161 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
Contained By:	Dissertation Abstracts International75-01B(E).
標題:	Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3596299
ISBN:	9781303427565

Chemical Approaches for Hetero-structured Thermoelectric Materials.
Zhang, Yichi.

Chemical Approaches for Hetero-structured Thermoelectric Materials. - 161 p.

Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.

Thesis (Ph.D.)--University of California, Santa Barbara, 2013.

The large-scale use of thermo-electrics for conversion of waste heat to electricity is currently limited by materials' cost and efficiency. The efficiency of a thermoelectric conversion is normally expressed through its figure of merit (zT=S 2sigmaT/kappa), where S is the Seebeck coefficient, sigma is the electrical conductivity, kappa is the thermal conductivity, and T is the absolute temperature. The key challenge in improving zT is the conflict dependence of the variables (S, sigma and kappa).

ISBN: 9781303427565Subjects--Topical Terms:

516420
Chemistry.

Chemical Approaches for Hetero-structured Thermoelectric Materials.
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245 1 0 $a Chemical Approaches for Hetero-structured Thermoelectric Materials.
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500 $a Source: Dissertation Abstracts International, Volume: 75-01(E), Section: B.
500 $a Adviser: Galen D. Stucky.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 2013.
520 $a The large-scale use of thermo-electrics for conversion of waste heat to electricity is currently limited by materials' cost and efficiency. The efficiency of a thermoelectric conversion is normally expressed through its figure of merit (zT=S 2sigmaT/kappa), where S is the Seebeck coefficient, sigma is the electrical conductivity, kappa is the thermal conductivity, and T is the absolute temperature. The key challenge in improving zT is the conflict dependence of the variables (S, sigma and kappa).
520 $a A strategy that could decouple the variables and thereby lead to an efficient and economical thermoelectric conversion is to fabricate nanoscaled hetero-structured materials through a large-scale and low-cost chemical route. In my research, two types of hetero-structures were demonstrated to have enhanced zT. The type I structure is a semiconductor matrix with mesoscaled pores. The pores are proved to substantially reduce kappa more than sigma by scattering the phonons at interfaces. In the type II structure, metallic Ag nanoparticles are homogeneously dispersed in a Sb2Te3 matrix using hydrazinium chemistry. After improving the thermal stability of Ag nanoinclusions in telluride by atomic layer deposition (ALD), a zT value of 1.0 at 460 K has been achieved, a record for a solution-processed film. This enhancement is mainly due to improvement of the Seebeck coefficient via a hot carrier filtering effect, along with the efficient scattering of phonons.
520 $a I believe that this new methodology will inspire the thermoelectric community in the development of improved thermoelectric systems.
590 $a School code: 0035.
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650 4 $a Materials science. $3 543314
650 4 $a Physical chemistry. $3 1981412
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710 2 $a University of California, Santa Barbara. $b Chemistry. $3 1029809
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