(Ln0.5M0.5) FeO3-δ perovskites as cathode for solid oxide fuel cells: Effect of mean radius of the A-site cations

K. Vidal; L. M. Rodríguez-Martínez; L. Ortega-San-Martín; M. L. Nó; T. Rojo; M. I. Arriortua

(Ln0.5M0.5) FeO3-δ perovskites as cathode for solid oxide fuel cells: Effect of mean radius of the A-site cations

K. Vidal, L. M. Rodríguez-Martínez, L. Ortega-San-Martín, M. L. Nó, T. Rojo, M. I. Arriortua

Sección de Química

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

4 Scopus citations

Abstract

Crystal structure, microstructure, electrical conductivity, and electrochemical performance of a family of iron perovskites with the general formula Ln0.5M0.5FeO3-δ (Ln=La and Pr; M=Sr, Ca, and Ba) has been studied as functions of mean A cation radius 〈rA〉. All the samples have a rhombohedral structure (space group: R ̄3c). Scanning electron microscope images show that the average grain size decreases with increasing 〈rA〉. The dc four-probe measurements indicate that all samples have high electrical conductivity, increasing with 〈rA〉. The electrochemical behavior of these cathode materials was evaluated by using current-voltage curve measurements and ac impedance spectroscopy over three-electrode electrolyte supported cells. The results show an improvement in cathode performance and a significant decrease in polarization resistance with increasing mean A cation radius 〈 rA 〉. © 2010 The Electrochemical Society.

Original language	Spanish
Journal	Journal of the Electrochemical Society
Volume	157
State	Published - 23 Jul 2010

Cite this

@article{0c966a7d5d7c43028464174594776439,

title = "(Ln0.5M0.5) FeO3-δ perovskites as cathode for solid oxide fuel cells: Effect of mean radius of the A-site cations",

abstract = "Crystal structure, microstructure, electrical conductivity, and electrochemical performance of a family of iron perovskites with the general formula Ln0.5M0.5FeO3-δ (Ln=La and Pr; M=Sr, Ca, and Ba) has been studied as functions of mean A cation radius 〈rA〉. All the samples have a rhombohedral structure (space group: R{\= }3c). Scanning electron microscope images show that the average grain size decreases with increasing 〈rA〉. The dc four-probe measurements indicate that all samples have high electrical conductivity, increasing with 〈rA〉. The electrochemical behavior of these cathode materials was evaluated by using current-voltage curve measurements and ac impedance spectroscopy over three-electrode electrolyte supported cells. The results show an improvement in cathode performance and a significant decrease in polarization resistance with increasing mean A cation radius 〈 rA 〉. {\textcopyright} 2010 The Electrochemical Society.",

author = "K. Vidal and Rodr{\'i}guez-Mart{\'i}nez, {L. M.} and L. Ortega-San-Mart{\'i}n and N{\'o}, {M. L.} and T. Rojo and Arriortua, {M. I.}",

year = "2010",

month = jul,

day = "23",

language = "Espa{\~n}ol",

volume = "157",

journal = "Journal of the Electrochemical Society",

issn = "0013-4651",

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TY - JOUR

T1 - (Ln0.5M0.5) FeO3-δ perovskites as cathode for solid oxide fuel cells: Effect of mean radius of the A-site cations

AU - Vidal, K.

AU - Rodríguez-Martínez, L. M.

AU - Ortega-San-Martín, L.

AU - Nó, M. L.

AU - Rojo, T.

AU - Arriortua, M. I.

PY - 2010/7/23

Y1 - 2010/7/23

N2 - Crystal structure, microstructure, electrical conductivity, and electrochemical performance of a family of iron perovskites with the general formula Ln0.5M0.5FeO3-δ (Ln=La and Pr; M=Sr, Ca, and Ba) has been studied as functions of mean A cation radius 〈rA〉. All the samples have a rhombohedral structure (space group: R ̄3c). Scanning electron microscope images show that the average grain size decreases with increasing 〈rA〉. The dc four-probe measurements indicate that all samples have high electrical conductivity, increasing with 〈rA〉. The electrochemical behavior of these cathode materials was evaluated by using current-voltage curve measurements and ac impedance spectroscopy over three-electrode electrolyte supported cells. The results show an improvement in cathode performance and a significant decrease in polarization resistance with increasing mean A cation radius 〈 rA 〉. © 2010 The Electrochemical Society.

AB - Crystal structure, microstructure, electrical conductivity, and electrochemical performance of a family of iron perovskites with the general formula Ln0.5M0.5FeO3-δ (Ln=La and Pr; M=Sr, Ca, and Ba) has been studied as functions of mean A cation radius 〈rA〉. All the samples have a rhombohedral structure (space group: R ̄3c). Scanning electron microscope images show that the average grain size decreases with increasing 〈rA〉. The dc four-probe measurements indicate that all samples have high electrical conductivity, increasing with 〈rA〉. The electrochemical behavior of these cathode materials was evaluated by using current-voltage curve measurements and ac impedance spectroscopy over three-electrode electrolyte supported cells. The results show an improvement in cathode performance and a significant decrease in polarization resistance with increasing mean A cation radius 〈 rA 〉. © 2010 The Electrochemical Society.

M3 - Artículo

SN - 0013-4651

VL - 157

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

ER -