Speaker
Description
A solid oxide fuel cell (SOFC) is an energy device that converts the chemical energy of hydrogen and oxygen directly into electrical energy using a single cell composed of an oxide-based anode/electrolyte/cathode. It has the characteristic of operating in the highest temperature range among various existing fuel cells [1].
Many researchers in the field of SOFC are currently focusing their efforts on improving cathodic properties mainly caused by cathode materials to achieve excellent electrochemical properties and enhanced power densities. Specifically, there are concentrations of research on various materials and structures applied to the cathode [2].
In terms of electrical conductivity, the research area of the cathode in SOFC focuses on achieving a minimum electrical conductivity of 100 S/cm or higher when the cathode of a typical solid oxide fuel cell operates within specific temperatures [3,4]. This electrical conductivity is a characteristic measured in the dense microstructure of the solid oxide fuel cell cathode. However, a typical cathode exhibits the characteristics of a porous microstructure to maximize the triple-phase boundary. In other words, there is a conflicting difference between the microstructure of the cathode as measured by electrical conductivity and the microstructure of the cathode used in practical applications. Particularly, the electrical conductivity characteristics that occur in the porous microstructure have not yet been fully elucidated [5].
Therefore, in this study, we compared and analyzed the electrical conductivity characteristics of the dense microstructure and porous microstructure using the core SOFC cathode material of our research group, Co-substituted layered perovskite (SmBa0.5Sr0.5Co2O5+d, hereafter SBSCO) cathode. Specifically, we will present the electrical conductivity characteristics of the porous cathode according to variables such as temperature, oxygen partial pressure, and Pt line positions at this conference.
References
[1] A.M. Abdalla, S. Hossain, A.T. Azad, P.M.I. Petra, F. Begum, S.G. Eriksson, A. K. Azad, Renew. Sustain. Energy Rev. 82 (2018) 353–368,
[2] A. Weber, E.I. Tiff´ee, J. Power Sources 127 (2004) 273–283
[3] E. Boehm , J.-M. Bassat , M.C. Steil , P. Dordor , F. Mauvy , J.-C. Grenier, Solid State Sci. 5 (2003) 973-981
[4] H.Y. Tu 1, Y. Takeda, N. Imanishi, O. Yamamoto, Solid State Ion. 100 (1997) 283-288
[5] K. E. Song, H. Schlegl, C. G. Kim, K. S. Baek, Y. R. Lim, J. H. Nam, H. S. Kim, J. H. Kim, Ceram. Int. 48 (2022) 28649–28658
| Keywords | solid oxide fuel cell, cathode materials, microstructure, electrical conductivity, layered perovskite |
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