BICU(TI)VOX as a Low/Intermediate Temperature SOFC Electrolyte: Another Look
BICU(TI)VOX as a Low/Intermediate Temperature SOFC Electrolyte: Another Look
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BICU(TI)VOX 作为低/中温 SOFC 电解质:另一种视角
DOI:
10.1002/9781119234531.ch3
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发表时间:
--
期刊:
影响因子:
--
通讯作者:
R. Moos
中科院分区:
文献类型:
--
作者:
P. Fuierer;K. Ring;J. Exner;R. Moos
ABSTRACT Bismuth vanadate (Bi2VO5. 5-) 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-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 cm-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.
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DOI:
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发表时间:
2004
期刊:
影响因子:
--
作者:
K. Shantha;K. Varma
通讯作者:
K. Varma
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
A. Yaremchenko;V. Kharton;E. N. Naumovich;F. Marques
通讯作者:
F. Marques
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
C. Pirovano;M. Steil;E. Capoen;G. Nowogrocki;R. Vannier
通讯作者:
R. Vannier
影响因子:
4.5
作者:
M. H. Paydar;A. Hadian;G. Fafilek
通讯作者:
G. Fafilek
影响因子:
2.1
作者:
Exner, Joerg;Fuierer, Paul;Moos, Ralf
通讯作者:
Moos, Ralf