Two-step Synthesis of Yttrium-doped Barium Zirconate Protonic Conductors

Autor(es)

Oliveira, O. R. ; Andrade, T. F. ; Muccillo, E. N. S. ; Berton, M. A. C. ; Garcia, C. M. ; Muccillo, R. ; Singhal, SC ; Yokokawa, H

• Tipo de documento: Artigo Científico
• Fonte: SOLID OXIDE FUEL CELLS 11 (SOFC-XI); v. 25, n. 2, p. 5-pg., 2009-01-01.

Resumo

Yttrium-doped barium zirconate protonic conductors were synthesized by a two-step route consisting on diffusing barium ions into previously prepared yttrium-doped zirconia. The evolution of the structural phase content was followed by in situ high temperature X-ray diffraction in the room temperature-1200 degrees C and by X-ray diffraction analysis of a mixture of cubic yttria-stabilized zirconia and barium carbonate heat treated at high temperatures. The attainment of the BaZr0.85Y0.15O3-delta composition was evaluated by X-ray fluorescence measurements. Pellets sintered at 1500 degrees C had the electrical behavior under humidified argon studied by impedance spectroscopy in the 300-600 degrees C in the 40 Hz-110 MHz frequency range. Unitary planar solid oxide fuel cells La0.6Sr0.4Fe0.8Co0.2O3/BaZr0.85Y0.15O3-delta/Pt were assembled for measuring the output voltage under operation with hydrogen, methane and ethanol as fuels and air as the oxidant. (AU)

• Processo FAPESP: 07/51631-0 - Desenvolvimento de eletrólitos sólidos condutores protônicos para células a combustíveis operacionais com metano
• Beneficiário: Olavo Rodrigues de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 05/53241-9 - Estudo de fenômenos intergranulares em materiais cerâmicos
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Temático