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Cobalt post-doping of solid oxide fu...

Leming, Andres.

Cobalt post-doping of solid oxide fuel cell cathodes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Cobalt post-doping of solid oxide fuel cell cathodes.
Author:	Leming, Andres.
Description:	162 p.
Notes:	Chair: Lutgard C. De Jonghe.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4776.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Engineering, Materials Science.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3146931
ISBN:	0496052594

Cobalt post-doping of solid oxide fuel cell cathodes.
Leming, Andres.

Cobalt post-doping of solid oxide fuel cell cathodes. - 162 p.

Chair: Lutgard C. De Jonghe.

Thesis (Ph.D.)--University of California, Berkeley, 2004.

A technique for doping solid oxide fuel cell cathodes with nanometer scale oxide particles was developed. The technique was applied to single component La(1-x)SrxMnO3 (LSM) and composite LSM/yttria-stabilized zirconia (YSZ) electrodes. The electrode behavior was examined both in symmetric electrode cells and in fuel cells under operating conditions. Polarization curves and electrochemical impedance spectroscopy were used to electrochemically characterize electrodes and fuel cells modified using this technique. A scanning electron microscope was used to characterize the microstructure. Based on data from a single component LSM electrode, an equivalent circuit for the cell response and a possible rate-limiting step for the oxygen reduction reaction were identified.

ISBN: 0496052594Subjects--Topical Terms:

226940
Engineering, Materials Science.

Cobalt post-doping of solid oxide fuel cell cathodes.
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245 1 0 $a Cobalt post-doping of solid oxide fuel cell cathodes.
300 $a 162 p.
500 $a Chair: Lutgard C. De Jonghe.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4776.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2004.
520 # $a A technique for doping solid oxide fuel cell cathodes with nanometer scale oxide particles was developed. The technique was applied to single component La(1-x)SrxMnO3 (LSM) and composite LSM/yttria-stabilized zirconia (YSZ) electrodes. The electrode behavior was examined both in symmetric electrode cells and in fuel cells under operating conditions. Polarization curves and electrochemical impedance spectroscopy were used to electrochemically characterize electrodes and fuel cells modified using this technique. A scanning electron microscope was used to characterize the microstructure. Based on data from a single component LSM electrode, an equivalent circuit for the cell response and a possible rate-limiting step for the oxygen reduction reaction were identified.
520 # $a Significant increases in cell performance were observed when using oxide catalysts. Out of the metals tested (Fe, Ni, Co, FeCo, NiCo) cobalt was found to form the most effective oxide catalyst particles. Cobalt oxide was also found to be more stable than platinum catalysts in tests longer than one day. Cobalt oxide catalysts were observed to increase the performance of single component LSM electrodes, composite LSM/YSZ electrodes and anode-supported fuel cells. The maximum power densities for the anode-supported cell were observed to increase 75, 78, 57, 28, 21, and 22% at 550, 600, 650, 700, 750, and 800°C respectively. The effects of thermal and current history were examined. Possible mechanisms for catalyst effectiveness were examined in the context of the reaction mechanism proposed.
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