Preparation and performance of triple-layer graded LaBaCo2O 5+δ-Ce0.8Sm0.2O1.9 composite cathode for intermediate-temperature solid oxide fuel cells

Ruifeng Li; Lin Ge; Han Chen; Lucun Guo

doi:10.1016/j.electacta.2012.08.071

Preparation and performance of triple-layer graded LaBaCo₂O _5+δ-Ce_0.8Sm_0.2O_1.9 composite cathode for intermediate-temperature solid oxide fuel cells

Ruifeng Li, Lin Ge, Han Chen, Lucun Guo

College of Materials Science and Engineering

Nanjing Tech University

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

17 Scopus citations

Abstract

The triple-layer graded LaBaCo₂O_5+δ-Sm _0.2Ce_0.8O_1.9 (LBCO-SDC) composite cathode was prepared by screen-printing method for intermediate-temperature solid oxide fuel cells. The result of X-ray diffraction indicated the LBCO cathode was chemically stable with the SDC electrolyte. Through optimizing the composition and microstructure, the electrochemical performance of cathode was significantly improved. For triple-layer graded LBCO-SDC composite cathode, the area-specific resistance (ASR) values were 0.881 Ω cm² at 600 °C, 0.174 Ω cm² at 700 °C and 0.047 Ω cm² at 800 °C in air, about 14.8%, 41.0% and 65.7% lower than that of the monolayer LBCO cathode, respectively. The cathodic overpotential was also decreased from 51.0 mV for the monolayer cathode to 33.6 mV at a current density of 0.20 A cm^-2 at 700 °C. The graded composite cathode showed great potential in improving the cathode performance for IT-SOFCs.

Original language	English
Pages (from-to)	273-277
Number of pages	5
Journal	Electrochimica Acta
Volume	85
DOIs	https://doi.org/10.1016/j.electacta.2012.08.071
State	Published - 15 Dec 2012

Keywords

Electrochemical performance
IT-SOFCs
Thermal expansion
Triple-layer graded cathode

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title = "Preparation and performance of triple-layer graded LaBaCo2O 5+δ-Ce0.8Sm0.2O1.9 composite cathode for intermediate-temperature solid oxide fuel cells",

abstract = "The triple-layer graded LaBaCo2O5+δ-Sm 0.2Ce0.8O1.9 (LBCO-SDC) composite cathode was prepared by screen-printing method for intermediate-temperature solid oxide fuel cells. The result of X-ray diffraction indicated the LBCO cathode was chemically stable with the SDC electrolyte. Through optimizing the composition and microstructure, the electrochemical performance of cathode was significantly improved. For triple-layer graded LBCO-SDC composite cathode, the area-specific resistance (ASR) values were 0.881 Ω cm2 at 600 °C, 0.174 Ω cm2 at 700 °C and 0.047 Ω cm2 at 800 °C in air, about 14.8%, 41.0% and 65.7% lower than that of the monolayer LBCO cathode, respectively. The cathodic overpotential was also decreased from 51.0 mV for the monolayer cathode to 33.6 mV at a current density of 0.20 A cm-2 at 700 °C. The graded composite cathode showed great potential in improving the cathode performance for IT-SOFCs.",

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author = "Ruifeng Li and Lin Ge and Han Chen and Lucun Guo",

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doi = "10.1016/j.electacta.2012.08.071",

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AU - Li, Ruifeng

AU - Ge, Lin

AU - Chen, Han

AU - Guo, Lucun

PY - 2012/12/15

Y1 - 2012/12/15

N2 - The triple-layer graded LaBaCo2O5+δ-Sm 0.2Ce0.8O1.9 (LBCO-SDC) composite cathode was prepared by screen-printing method for intermediate-temperature solid oxide fuel cells. The result of X-ray diffraction indicated the LBCO cathode was chemically stable with the SDC electrolyte. Through optimizing the composition and microstructure, the electrochemical performance of cathode was significantly improved. For triple-layer graded LBCO-SDC composite cathode, the area-specific resistance (ASR) values were 0.881 Ω cm2 at 600 °C, 0.174 Ω cm2 at 700 °C and 0.047 Ω cm2 at 800 °C in air, about 14.8%, 41.0% and 65.7% lower than that of the monolayer LBCO cathode, respectively. The cathodic overpotential was also decreased from 51.0 mV for the monolayer cathode to 33.6 mV at a current density of 0.20 A cm-2 at 700 °C. The graded composite cathode showed great potential in improving the cathode performance for IT-SOFCs.

AB - The triple-layer graded LaBaCo2O5+δ-Sm 0.2Ce0.8O1.9 (LBCO-SDC) composite cathode was prepared by screen-printing method for intermediate-temperature solid oxide fuel cells. The result of X-ray diffraction indicated the LBCO cathode was chemically stable with the SDC electrolyte. Through optimizing the composition and microstructure, the electrochemical performance of cathode was significantly improved. For triple-layer graded LBCO-SDC composite cathode, the area-specific resistance (ASR) values were 0.881 Ω cm2 at 600 °C, 0.174 Ω cm2 at 700 °C and 0.047 Ω cm2 at 800 °C in air, about 14.8%, 41.0% and 65.7% lower than that of the monolayer LBCO cathode, respectively. The cathodic overpotential was also decreased from 51.0 mV for the monolayer cathode to 33.6 mV at a current density of 0.20 A cm-2 at 700 °C. The graded composite cathode showed great potential in improving the cathode performance for IT-SOFCs.

KW - Electrochemical performance

KW - IT-SOFCs

KW - Thermal expansion

KW - Triple-layer graded cathode

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ER -

Preparation and performance of triple-layer graded LaBaCo₂O _5+δ-Ce_0.8Sm_0.2O_1.9 composite cathode for intermediate-temperature solid oxide fuel cells

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