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Issue 36, 2014
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Structural, electrical and electrochemical characteristics of La0.1Sr0.9Co1−xNbxO3−δ as a cathode material for intermediate temperature solid oxide fuel cells

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Abstract

The perovskite-oxides, such as (La, Sr)CoO3, have received a large amount of attention in recent years as cathode materials for intermediate temperature-solid oxide fuel cells (IT-SOFCs). In this study, we have investigated the structural, electrical, and electrochemical properties of La0.1Sr0.9Co1−xNbxO3−δ (x = 0, 0.1, 0.15, and 0.2) cathodes under IT-SOFC operating conditions. Nb doping significantly improves the structural stability and electrochemical performance of La0.1Sr0.9Co1−xNbxO3−δ (LSCNbx) oxides compared to undoped La0.1Sr0.9CoO3−δ (LSC). At a given temperature, the electrical conductivity decreases with further increases of the Nb doping content. The electrochemical performance of LSCNbx–GDC cathodes is measured using an LSCNbx–GDC/GDC/Ni–GDC anode supported cell. For LSCNbx (x = 0.1), the maximum power density of a single cell is 1.478 W cm−2 at 600 °C. The Nb doped LSCNbx (x = 0.1) perovskite is recommended, considering its high power density and structural stability as an IT-SOFC cathode material.

Graphical abstract: Structural, electrical and electrochemical characteristics of La0.1Sr0.9Co1−xNbxO3−δ as a cathode material for intermediate temperature solid oxide fuel cells

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Publication details

The article was received on 10 Mar 2014, accepted on 07 Apr 2014 and first published on 22 Apr 2014


Article type: Paper
DOI: 10.1039/C4RA02061H
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Citation: RSC Adv., 2014,4, 18710-18717
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    Structural, electrical and electrochemical characteristics of La0.1Sr0.9Co1−xNbxO3−δ as a cathode material for intermediate temperature solid oxide fuel cells

    S. Yoo, J. Kim, S. Y. Song, D. W. Lee, J. Shin, K. M. Ok and G. Kim, RSC Adv., 2014, 4, 18710
    DOI: 10.1039/C4RA02061H

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