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Continuum Modeling of Mixed Conducto...

Ciucci, Francesco.

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Continuum Modeling of Mixed Conductors: a Study of Ceria.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Continuum Modeling of Mixed Conductors: a Study of Ceria./
Author:	Ciucci, Francesco.
Description:	175 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.
Contained By:	Dissertation Abstracts International73-11B(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3516964
ISBN:	9781267468420

Continuum Modeling of Mixed Conductors: a Study of Ceria.
Ciucci, Francesco.

Continuum Modeling of Mixed Conductors: a Study of Ceria. - 175 p.

Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.

Thesis (Ph.D.)--California Institute of Technology, 2009.

In this thesis we have derived a new way to analyze the impedance response of mixed conducting materials for use in solid oxide fuel cells (SOFCs), with the main focus on anodic materials, in particular cerium oxides.

ISBN: 9781267468420Subjects--Topical Terms:

543314
Materials science.

Continuum Modeling of Mixed Conductors: a Study of Ceria.
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020 $a 9781267468420
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100 1 $a Ciucci, Francesco. $3 3188345
245 1 0 $a Continuum Modeling of Mixed Conductors: a Study of Ceria.
300 $a 175 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.
500 $a Advisers: David G. Goodwin; Fred EC Culick.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2009.
520 $a In this thesis we have derived a new way to analyze the impedance response of mixed conducting materials for use in solid oxide fuel cells (SOFCs), with the main focus on anodic materials, in particular cerium oxides.
520 $a First we have analyzed the impact of mixed conductivity coupled to electrocatalytic behavior in the linear time-independent domain for a thick ceria sample. We have derived that, for a promising fuel cell material, Samarium Doped Ceria, chemical reactions are the determining component of the polarization resistance.
520 $a As a second step we have extended the previous model to the time-dependent case, where we focused on single harmonic excitation, the impedance spectroscopy conditions. We extended the model to the case where some input diffusivities are spatially nonuniform. For instance we considered the case where diffusivities change significantly in the vicinity of the electrocatalytic region.
520 $a As a third and final step we use to model to capture the two dimensional behavior of mixed conducting thin films, where the electronic motion from one side of the sample to the other is impeded. Such conditions are similar to those encountered in fuel cells where an electrolyte conducting exclusively oxygen ions is placed between the anode and the cathode. The framework developed was also extended to study a popular cathodic material, Lanthanum Manganite.
520 $a The model is used to give unprecedented insight in SOFC polarization resistance analysis of mixed conductors. It helps elucidate rigorously rate determining steps and to address the interplay of diffusion with diffusion losses. Electrochemical surface losses dominate for most experimental conditions of Samarium Doped Ceria and they are shown to be strongly dependent on geometry.
590 $a School code: 0037.
650 4 $a Materials science. $3 543314
650 4 $a Physical chemistry. $3 1981412
650 4 $a Mechanical engineering. $3 649730
690 $a 0794
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710 2 $a California Institute of Technology. $b Engineering and Applied Science. $3 2093123
773 0 $t Dissertation Abstracts International $g 73-11B(E).
790 $a 0037
791 $a Ph.D.
792 $a 2009
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3516964