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Electrochemical performance of LSM–SDC electrodes prepared with ion-impregnated LSM by Xingyan Xu; Chuanbao Cao; Changrong Xia; Dingkun Peng is a Materials Science article available to read on EtoBox.

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La 0.85 Sr 0.15 ) 0.9 MnO 3Àd (LSM)-Sm 0.2 Ce 0.8 O 1.9 (SDC) (50:50 wt.%) composites, which are potential cathodes for intermediate-temperature solid oxide fuel cells, were prepared with a two-step fabricating process including screen-printing and ion-impregnation. SDC frame was screenprinted on electrolyte substrates and LSM was subsequently ion-impregnated to the SDC frame. The interfacial polarization resistances (area specific resistances) of the resulted electrodes were much lower than those prepared with a conventional screen-printing technique and also lower than those with impregnated SDC. At 700 8C, the total resistance was only 0.35 V cm 2 for an LSM-SDC electrode with impregnated LSM compared to 0.94 V cm 2 for a conventional electrode. Impedance spectroscopy was used to study the oxygen reduction kinetics within the electrodes. Three arcs were typically observed on the impedance spectrum. The high-frequency arc was attributed to oxygen ion transfer from the three-phase boundary to the electrolyte, while the intermediate-frequency arc was attributed to oxygen dissociation and adsorption. At high temperature, the arc due to gas phase diffusion was observed in the low fre

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Author

Xingyan Xu; Chuanbao Cao; Changrong Xia; Dingkun Peng

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0272-8842)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)