Chemical stability and electrical properties of Nb doped BaCe0.9Y0.1O3-delta as a high temperature proton conducting electrolyte for IT-SOFC

Autor(es)

Radojkovic, A. ^[1] ; Zunic, M. ^{[1, 2]} ; Savic, S. M. ^[1] ; Brankovic, G. ^[1] ; Brankovic, Z. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Belgrade, Inst Multidisciplinary Res, Belgrade 11030 - Serbia

^[2] UNESP LIEC, Inst Quim, CMDMC, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 39, n. 1, p. 307-313, 2013.
• Citações Web of Science: 29

Resumo

BaCe0.9-xNbxY0.1O3-delta (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 degrees C. The electrical conductivities determined by impedance measurements in temperature range of 550-750 degrees 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 BaCe0.87Nb0.03Y0.1O3-delta is the optimal composition that satisfies the opposite demands for electrical conductivity and chemical stability, reaching 0.8 x 10(-2) S cm(-1) in wet hydrogen at 650 degrees C compared to 1.01 x 10(-2) S cm(-1) for undoped electrolyte. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 10/20574-3 - Filmes de Eletrólitos Baseados em Condutores de Protons em Altas Temperaturas para Aplicação em IT-SOFCs
• Beneficiário: Milan Zunic
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado