Synthesis and Application of <TEX>$CeO_2-Sm_2O_3$</TEX> Solid Electrolyte Membranes with Electronic and Ionic Conductivities

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J. Korean Ceram. Soc. > Volume 35(4); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(4): 355.

전자 및 이온 전도성 $CeO_2-Sm_2O_3$ 고체 전해질 막의 합성 및 응용

현상훈, 권재환, 김승구¹, 김계태

연세대학교 세라믹공학과
¹연세대학교 세라믹공학

Synthesis and Application of $CeO_2-Sm_2O_3$ Solid Electrolyte Membranes with Electronic and Ionic Conductivities

ABSTRACT

The oxygen flux of SDC ($Sm_2O_3;doped;CeO_2$) solid electrolyte membranes with electronic and oxygen ion-ic conductivities has been investigated as a basic research in order to develop the conversion process of na-tural gas to syngas using the ceramic membrane reactor. Tube type membranes(1 mm thickness) were fa-bricated by slip casting of SDC powders prepared by the oxalate coprecipitaion method. Dense oxygen per-meation membranes(0.1 mm thickness) could be synthesized via sintering at $1450^{circ}C$ for 2h and their re-lative density was over 95% The oxygen flux through SDC membranes doped 20mol% $Sm_15$ was about $1.13{times}10^{-5};mol/m_2{cdot}sec$ at low temperature around $800^{circ}C$. In addition the SDC membranes showed a good thermaal stability for a long period of service.

Key words: Oxalate coprecipitation, $Sm_2O_3$ doped $CeO_2$ powder, $CeO_2-Sm_2O_3$ solid electolyte, Mixed conductive membrance, Oxygen permeation membrane