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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/74163
Título: 
Chemical stability and electrical properties of Nb doped BaCe 0.9Y 0.1O 3-δ as a high temperature proton conducting electrolyte for IT-SOFC
Autor(es): 
Instituição: 
  • University of Belgrade
  • Universidade Estadual Paulista (UNESP)
ISSN: 
0272-8842
Resumo: 
BaCe 0.9-xNb xY 0.1O 3-δ (where x=0, 0.01, 0.03 and 0.05) powders were synthesized by solid-state reaction to investigate the influence of Nb concentration on chemical stability and electrical properties of the sintered samples. The dense electrolyte pellets were formed from the powders after being uniaxially pressed and sintered at 1550 °C. The electrical conductivities determined by impedance measurements in temperature range of 550-750 °C in different atmospheres (dry argon and wet hydrogen) showed a decreasing trend with an increase of Nb content. For all samples higher conductivities were observed in the wet hydrogen than in dry argon atmosphere. The chemical stability was enhanced with increasing of Nb concentration. It was found that BaCe 0.87Nb 0.03Y 0.1O 3-δ is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stability, reaching 0.8×10 -2 S cm -1 in wet hydrogen at 650 °C compared to 1.01×10 -2 S cm -1 for undoped electrolyte. © 2012 Elsevier Ltd and Techna Group S.r.l.
Data de publicação: 
1-Jan-2013
Citação: 
Ceramics International, v. 39, n. 1, p. 307-313, 2013.
Duração: 
307-313
Palavras-chaves: 
  • C. Ionic conductivity
  • D. Perovskites
  • E. Fuel cells
  • Argon atmospheres
  • E. fuel cells
  • Electrical conductivity
  • High temperature
  • Impedance measurement
  • IT-SOFCs
  • Optimal composition
  • Proton-conducting electrolyte
  • Sintered samples
  • Temperature range
  • Electric conductivity
  • Electrolytes
  • Hydrogen
  • Perovskite
  • Powders
  • Sintering
  • Solid state reactions
  • Chemical stability
Fonte: 
http://dx.doi.org/10.1016/j.ceramint.2012.06.026
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/74163
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