Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating

Jeong Woo Yun, Sung Pil Yoon, Sanggyun Park, Jonghee Han, SukWoo Nam, Tae Hoon Lim, Jin Soo Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

To increase the performance of solid oxide fuel cells operated at intermediate temperatures (<700 °C), we used the electronic conductor La0.8Sr0.2MnO3 (LSM) and the mixed conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) to modify the cathode in the electrode microstructure. For both cathode materials, we employed a Sm0.2Ce0.8O2 (SDC) buffer layer as a diffusion barrier on the yttria-stabilized zirconia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3 and La2Zr2O7, which have a poor ionic conductivity. These interfacial reaction products were formed only minimally at the electrolyte-cathode interlayer after sintering the SDC layer at high temperature; in addition, the degree of cathode polarization also decreased. Moreover to extend the triple phase boundary and improve cell performance at intermediate temperatures, we used sol-gel methods to coat an SDC layer on the cathode pore walls. The cathode resistance of the LSCF cathode cell featuring SDC modification reached as low as 0.11 Ω cm2 in air when measured at 700 °C. The maximum power densities of the cells featuring the modified LSCF and LSM cathodes were 369 and 271 mW/cm2, respectively, when using O2 as the oxidant and H2 as the fuel.

Original languageEnglish
Pages (from-to)9213-9219
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number22
DOIs
Publication statusPublished - 2009 Nov 1
Externally publishedYes

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Sol-gels
Cathodes
cathodes
gels
coatings
Coatings
Temperature
temperature
interlayers
conductors
electrolytes
cell cathodes
Electrolytes
Diffusion barriers
yttria-stabilized zirconia
cells
Yttria stabilized zirconia
reaction products

Keywords

  • Ceria coating
  • Diffusion barrier layer
  • Intermediate-temperature solid oxide fuel cell
  • LaSrCoFeO
  • LaSrMnO

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating. / Yun, Jeong Woo; Yoon, Sung Pil; Park, Sanggyun; Han, Jonghee; Nam, SukWoo; Lim, Tae Hoon; Kim, Jin Soo.

In: International Journal of Hydrogen Energy, Vol. 34, No. 22, 01.11.2009, p. 9213-9219.

Research output: Contribution to journalArticle

Yun, Jeong Woo ; Yoon, Sung Pil ; Park, Sanggyun ; Han, Jonghee ; Nam, SukWoo ; Lim, Tae Hoon ; Kim, Jin Soo. / Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating. In: International Journal of Hydrogen Energy. 2009 ; Vol. 34, No. 22. pp. 9213-9219.
@article{b2c4135de42846ba8ed013a023723048,
title = "Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating",
abstract = "To increase the performance of solid oxide fuel cells operated at intermediate temperatures (<700 °C), we used the electronic conductor La0.8Sr0.2MnO3 (LSM) and the mixed conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) to modify the cathode in the electrode microstructure. For both cathode materials, we employed a Sm0.2Ce0.8O2 (SDC) buffer layer as a diffusion barrier on the yttria-stabilized zirconia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3 and La2Zr2O7, which have a poor ionic conductivity. These interfacial reaction products were formed only minimally at the electrolyte-cathode interlayer after sintering the SDC layer at high temperature; in addition, the degree of cathode polarization also decreased. Moreover to extend the triple phase boundary and improve cell performance at intermediate temperatures, we used sol-gel methods to coat an SDC layer on the cathode pore walls. The cathode resistance of the LSCF cathode cell featuring SDC modification reached as low as 0.11 Ω cm2 in air when measured at 700 °C. The maximum power densities of the cells featuring the modified LSCF and LSM cathodes were 369 and 271 mW/cm2, respectively, when using O2 as the oxidant and H2 as the fuel.",
keywords = "Ceria coating, Diffusion barrier layer, Intermediate-temperature solid oxide fuel cell, LaSrCoFeO, LaSrMnO",
author = "Yun, {Jeong Woo} and Yoon, {Sung Pil} and Sanggyun Park and Jonghee Han and SukWoo Nam and Lim, {Tae Hoon} and Kim, {Jin Soo}",
year = "2009",
month = "11",
day = "1",
doi = "10.1016/j.ijhydene.2009.08.091",
language = "English",
volume = "34",
pages = "9213--9219",
journal = "International Journal of Hydrogen Energy",
issn = "0360-3199",
publisher = "Elsevier Limited",
number = "22",

}

TY - JOUR

T1 - Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating

AU - Yun, Jeong Woo

AU - Yoon, Sung Pil

AU - Park, Sanggyun

AU - Han, Jonghee

AU - Nam, SukWoo

AU - Lim, Tae Hoon

AU - Kim, Jin Soo

PY - 2009/11/1

Y1 - 2009/11/1

N2 - To increase the performance of solid oxide fuel cells operated at intermediate temperatures (<700 °C), we used the electronic conductor La0.8Sr0.2MnO3 (LSM) and the mixed conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) to modify the cathode in the electrode microstructure. For both cathode materials, we employed a Sm0.2Ce0.8O2 (SDC) buffer layer as a diffusion barrier on the yttria-stabilized zirconia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3 and La2Zr2O7, which have a poor ionic conductivity. These interfacial reaction products were formed only minimally at the electrolyte-cathode interlayer after sintering the SDC layer at high temperature; in addition, the degree of cathode polarization also decreased. Moreover to extend the triple phase boundary and improve cell performance at intermediate temperatures, we used sol-gel methods to coat an SDC layer on the cathode pore walls. The cathode resistance of the LSCF cathode cell featuring SDC modification reached as low as 0.11 Ω cm2 in air when measured at 700 °C. The maximum power densities of the cells featuring the modified LSCF and LSM cathodes were 369 and 271 mW/cm2, respectively, when using O2 as the oxidant and H2 as the fuel.

AB - To increase the performance of solid oxide fuel cells operated at intermediate temperatures (<700 °C), we used the electronic conductor La0.8Sr0.2MnO3 (LSM) and the mixed conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) to modify the cathode in the electrode microstructure. For both cathode materials, we employed a Sm0.2Ce0.8O2 (SDC) buffer layer as a diffusion barrier on the yttria-stabilized zirconia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3 and La2Zr2O7, which have a poor ionic conductivity. These interfacial reaction products were formed only minimally at the electrolyte-cathode interlayer after sintering the SDC layer at high temperature; in addition, the degree of cathode polarization also decreased. Moreover to extend the triple phase boundary and improve cell performance at intermediate temperatures, we used sol-gel methods to coat an SDC layer on the cathode pore walls. The cathode resistance of the LSCF cathode cell featuring SDC modification reached as low as 0.11 Ω cm2 in air when measured at 700 °C. The maximum power densities of the cells featuring the modified LSCF and LSM cathodes were 369 and 271 mW/cm2, respectively, when using O2 as the oxidant and H2 as the fuel.

KW - Ceria coating

KW - Diffusion barrier layer

KW - Intermediate-temperature solid oxide fuel cell

KW - LaSrCoFeO

KW - LaSrMnO

UR - http://www.scopus.com/inward/record.url?scp=71849119168&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=71849119168&partnerID=8YFLogxK

U2 - 10.1016/j.ijhydene.2009.08.091

DO - 10.1016/j.ijhydene.2009.08.091

M3 - Article

VL - 34

SP - 9213

EP - 9219

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 22

ER -