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

H. Fukunaga; M. Koyama; N. Takahashi; C. Wen; K. Yamada

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

Reaction model of dense Sm_0.5Sr_0.5CoO₃ as SOFC cathode

H. Fukunaga, M. Koyama, N. Takahashi, C. Wen, K. Yamada

Research output: Contribution to journal › Article › peer-review

195 Citations (Scopus)

Abstract

Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm_0.5Sr_0.5CoO₃ (SSC) as SOFC cathode. From the P_O(2) 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 La_0.6Sr_0.4CoO₃. These rate constants can elucidate the overpotentials of porous electrodes.

Original language	English
Pages (from-to)	279-285
Number of pages	7
Journal	Solid State Ionics
Volume	132
Issue number	3
DOIs	https://doi.org/10.1016/s0167-2738(00)00642-1
Publication status	Published - Jul 2 2000

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode",

abstract = "Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the PO(2) 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.",

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T1 - Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode

AU - Fukunaga, H.

AU - Koyama, M.

AU - Takahashi, N.

AU - Wen, C.

AU - Yamada, K.

PY - 2000/7/2

Y1 - 2000/7/2

N2 - Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the PO(2) 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.

AB - Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the PO(2) 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.

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Reaction model of dense Sm_0.5Sr_0.5CoO₃ as SOFC cathode

Abstract

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