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BICU(TI)VOX as a Low/Intermediate Temperature SOFC Electrolyte : Another Look

Title data

Fuierer, Paul ; Ring, Kevin ; Exner, Jörg ; Moos, Ralf:
BICU(TI)VOX as a Low/Intermediate Temperature SOFC Electrolyte : Another Look.
In: Pfeifer, Thomas ; Matyáš, Josef ; Balaya, Palani ; Singh, Dileep ; Wei, John (ed.): Ceramics for Energy Conversion, Storage, and Distribution Systems : a collection of papers persented at CMCEE-11, June 14-19, 2015, Vancouver, BC, Canada CMCEE-11. - Hoboken, New Jersey : Wiley , 2016 . - pp. 29-40 . - Online-Ressource . - (Ceramic Transactions ; 255 )
ISBN 978-1-119-23453-1
DOI: https://doi.org/10.1002/9781119234531.ch3

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMO 1060/16-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Bismuth vanadate (Bi₂VO₅.₅-δ) ceramics, stabilized by partial substitution of V⁵⁺ with transition metal ions, exhibit high ionic conductivity at temperatures below 500°C. For use as SOFC electrolyte, the ceramic has been dismissed by some due to reports of mixed conduction at higher temperature and reducing or low pO₂ atmosphere. The two-dimensional conductivity of the oxide vacancies within the layered crystal structure also poses challenges. In the current study, an unique processing scheme was used to produce high density and textured polycrystalline Bi₂(V0.9Cu0.1)O₅.₅-δ ceramics. Platelet seeds, produced by molten salt synthesis (MSS), were dispersed within a matrix of fine powders to incite templated grain growth (tgg) during hot forging (HF). Bulk ceramics show high oxide ion conductivity (10⁻¹ Ωcm⁻¹) at 500°C, and modest texture gives modest anisotropy. Long term stability of the conductivity at this temperature over a range of pO₂ was demonstrated, however at lower temperatures (400°C), larger-grained and textured samples exhibit instability associated with oxygen vacancy ordering. Small grain size in conventionally sintered samples appears to mitigate this instability, as does Ti co-doping. Measured thermal expansion (16-20 ppm/°C), also showing small anisotropy in textured samples, may be compatible with metals in SOFC design.

Further data

Item Type: Article in a book
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 07 Dec 2016 08:39
Last Modified: 07 Dec 2016 08:39
URI: https://eref.uni-bayreuth.de/id/eprint/35416