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Thermodynamic stability of perovskit...

Cetin, Deniz.

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Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells./
Author:	Cetin, Deniz.
Description:	106 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10193499
ISBN:	9781369357813

Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells.
Cetin, Deniz.

Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells. - 106 p.

Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.

Thesis (Ph.D.)--Boston University, 2016.

The need for cleaner and more efficient alternative energy sources is becoming urgent as concerns mount about climate change wrought by greenhouse gas emissions. Solid oxide fuel cells (SOFCs) are one of the most efficient options if the goal is to reduce emissions while still operating on fossil energy resources. One of the foremost problems in SOFCs that causes efficiency loss is the polarization resistance associated with the oxygen reduction reaction(ORR) at the cathodes. Hence, improving the cathode design will greatly enhance the overall performance of SOFCs.

ISBN: 9781369357813Subjects--Topical Terms:

543314
Materials science.

Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells.
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100 1 $a Cetin, Deniz. $3 3195089
245 1 0 $a Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells.
300 $a 106 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
500 $a Adviser: Srikanth Gopalan.
502 $a Thesis (Ph.D.)--Boston University, 2016.
520 $a The need for cleaner and more efficient alternative energy sources is becoming urgent as concerns mount about climate change wrought by greenhouse gas emissions. Solid oxide fuel cells (SOFCs) are one of the most efficient options if the goal is to reduce emissions while still operating on fossil energy resources. One of the foremost problems in SOFCs that causes efficiency loss is the polarization resistance associated with the oxygen reduction reaction(ORR) at the cathodes. Hence, improving the cathode design will greatly enhance the overall performance of SOFCs.
520 $a Lanthanum nickelate, La2NiO4+delta (LNO), is a mixed ionic and electronic conductor that has competitive surface oxygen exchange and transport properties and excellent electrical conductivity compared to perovskite-type oxides. This makes it an excellent candidate for solid oxide fuel cell (SOFC) applications. It has been previously shown that composites of LNO with Sm0.2Ce0.8O2-delta (SDC20) as cathode materials lead to higher performance than standalone LNO. However, in contact with lanthanide-doped ceria, LNO decomposes resulting in free NiO and ceria with higher lanthanide dopant concentration.
520 $a In this study, the aforementioned instability of LNO has been addressed by compositional tailoring of LNO: lanthanide doped ceria (LnxCe 1-xO2,LnDC)composite. By increasing the lanthanide dopant concentration in the ceria phase close to its solubility limit, the LNO phase has been stabilized in the LNO:LnDC composites. Electrical conductivity of the composites as a function of LNO volume fraction and temperature has been measured, and analyzed using a resistive network model which allows the identification of a percolation threshold for the LNO phase. The thermomechanical compatibility of these composites has been investigated with SOFC systems through measurement of the coefficients of thermal expansion. LNO:LDC40 composites containing LNO lower than 50 vol%and higher than 40 vol% were identified as being suitable to incorporate into full button cell configuration from the standpoint of thermomechanical stability and adequate electrical conductivity. Proof-of-concept performance comparison for SOFC button cells manufactured using LNO: La 0.4Ce0.6O2-delta composite to the conventional composite cathode materials has also been provided. This thermodynamics-based phase stabilization strategy can be applied to a wider range of materials in the same crystallographic family, thus providing the SOFC community with alternate material options for high performance devices.
590 $a School code: 0017.
650 4 $a Materials science. $3 543314
650 4 $a Alternative Energy. $3 1035473
690 $a 0794
690 $a 0363
710 2 $a Boston University. $b Materials Science & Engineering ENG. $3 3195090
773 0 $t Dissertation Abstracts International $g 78-04B(E).
790 $a 0017
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10193499