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 language | English |
|---|---|
| Pages (from-to) | 9213-9219 |
| Number of pages | 7 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 34 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - 2009 Nov 1 |
| Externally published | Yes |
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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 journal › Article
}
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
AN - SCOPUS:71849119168
VL - 34
SP - 9213
EP - 9219
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 22
ER -