Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode

H Fukunaga

doi:10.1016/s0167-2738(00)00642-1

Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode

DOI Web Site Web Site 被引用文献6件

H Fukunaga

書誌事項

公開日: 2000-07-02

権利情報

https://www.elsevier.com/tdm/userlicense/1.0/

DOI

10.1016/s0167-2738(00)00642-1

公開者: Elsevier BV

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説明

Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the PO2 dependence of interfacial conductivity, the rate determining step of dense SSC electrode was adsorption and desorption processes at the surface of the electrode. Rate constants of adsorption and desorption were calculated from the interfacial conductivity of the dense electrode to be 3×10−5 mol cm−2 s−1 atm−1 and 2×10−8 mol cm−2 s−1, respectively. These were approximately one order of magnitude larger than the corresponding values calculated for La0.6Sr0.4CoO3. These rate constants can elucidate the overpotentials of porous electrodes.