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Investigation of Plasma Sprayed and Constrained-Sintered Zirconia Based Electrolytes

Christenn, Claudia und Ansar, Asif (2009) Investigation of Plasma Sprayed and Constrained-Sintered Zirconia Based Electrolytes. International Thermal Spray Conference and Exposition 2009 (ITSC 2009), 2009-05-04 - 2009-05-07, USA.

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Kurzfassung

Solid oxide fuel cells (SOFCs) electrochemically convert chemical energy into electrictrical power. A SOFC consists of a porous cathode, a gas tight oxygen ion conductive electrolyte, and a porous anode. The ionic conductivity of usually used yttria-stabilized zirconia (YSZ) electrolyte shows a strong dependency on layer thickness and cell operating temperature. Usually SOFCs operate in a temperature range of 900 to 1000 °C. The current development in SOFCs is focused on reducing the operating temperature below 800 °C. Reduction of cell temperature leads to decrease of ionic conductivity of electrolytes following Arrhenius law. To solve this problem two different ways are possible: a) reducing the thickness of the conventionally used yttria-stabilized zirconia (YSZ) electrolyte by using nanostructured particles as feedstock or b) by using an electrolyte with improved ionic conductivity for IT-SOFCs. Conventional and nanostructured YSZ electrolyte layers were prepared by plasma spraying. As all thermal sprayed coatings contain some porosity, which influences the cell performance, sprayed electrolyte layers were sintered in a second step. Conventional sintering of electrolytes is performed over several hours at temperatures above 1400 °C. Thin sprayed layers were sintered in the temperature range of 800 to 1520 °C. Nanostructured YSZ particles after spraying maintained nanostructure. Nanostructure material assisted in enhancing the kinetics for sintering and grain growth. Coatings of both materials were under compressive stresses. However, it was observed that sintering of free-standing coatings differed from that of coatings on substrates which was explained by theory of constrained sintering. A detailed comparison of sintering behaviour under constrained and non-constrained conditions for conventional and nanostructured YSZ was developed. All constrained sintering measurements were performed in a dilatometer. Sintering properties, microstructure, and conductivity of sprayed and sintered YSZ electrolyte layers were investigated by Scanning electron microscopy, 4-point dc method, and mercury intrusion porosimetry and image analysis.

elib-URL des Eintrags:https://elib.dlr.de/61240/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Investigation of Plasma Sprayed and Constrained-Sintered Zirconia Based Electrolytes
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Christenn, ClaudiaTTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ansar, AsifTTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Mai 2009
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Plasma spraying, Solid oxide fuel cell, Electrolyte, YSZ, Sintering
Veranstaltungstitel:International Thermal Spray Conference and Exposition 2009 (ITSC 2009)
Veranstaltungsort:USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:4 Mai 2009
Veranstaltungsende:7 Mai 2009
Veranstalter :German Welding Society (DVS), ASM Thermal Spray Society (TSS), and the International Institute of Welding (IIW)
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung (alt)
HGF - Programmthema:E BZ - Brennstoffzellen (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E BZ - Brennstoffzellen
DLR - Teilgebiet (Projekt, Vorhaben):E - Hochtemperatur-Brennstoffzellen (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Christenn, Claudia
Hinterlegt am:03 Dez 2009 14:02
Letzte Änderung:24 Apr 2024 19:26

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