J0601-1-3 固体酸化物形燃料電池の電解質特性に及ぼす原料粉末中の水分の影響(SOFC内の電極近傍現象)

概要

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Defects of thin electrolyte films that compose SOFCs affect the power generation performance significantly. It found that the defects were caused by water absorbed on raw material powder. After pre-sintering raw material powder (8molY_2O_3-ZrO_2 : YSZ) under the conditions of various temperatures and times, the electrolytes (about 30μm in thickness) were fabricated by dip-coating method. The micro-structures of the electrolytes were observed with a scanning electron microscope and a laser scanning confocal microscope. The power generation performances of cells with the electrolytes were also investigated. As results, the electrolyte fabricated using YSZ powder after per-sintering under the condition of 200℃ for 120hours was dense and its cell showed reasonable generation performance, whereas the electrolyte under the condition of 200℃ for 20hours was porous and the open circuit voltage of its cell was considerably lower than theoretical value.
2009-09-12