Abstract
This work introduces a novel silver composite cathode with a surface coating of scandia-stabilized zirconia (ScSZ) nanoparticles for application in intermediate temperature solid oxide fuel cells (IT-SOFCs). The ScSZ coating is expected to maximize the triple boundary area of the Ag electrode, ScSZ electrolyte, and oxygen gas, where the oxygen reduction reaction occurs. The coating also protects the porous Ag against thermal agglomeration during fuel cell operation. The ScSZ nanoparticles are prepared by sputtering scandium-zirconium alloy followed by thermal oxidation on Ag mesh. The performance of the solid oxide fuel cells with a gadolinia-doped ceria electrolyte support is evaluated. At temperatures <500 °C, our optimized Ag-ScSZ cathode outperforms the bare Ag cathode and even the platinum cathode, which has been believed to be the best material for this purpose. The highest cell peak power with the Ag-ScSZ cathode is close to 60 mW cm-2 at 450 °C, while bare Ag and optimized Pt cathodes produce 38.3 and 49.4 mW cm-2, respectively. Long-term current measurement also confirms that the Ag-ScSZ cathode is thermally stable, with less degradation than bare Ag or Pt.
| Original language | English |
|---|---|
| Journal | Advanced Energy Materials |
| DOIs | |
| Publication status | Accepted/In press - 2016 |
Fingerprint
Keywords
- Cathode
- Intermediate temperature
- Scandia-stabilized zirconia
- Silver
- Solid oxide fuel cells
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
High-Performance Silver Cathode Surface Treated with Scandia-Stabilized Zirconia Nanoparticles for Intermediate Temperature Solid Oxide Fuel Cells. / Choi, Hyung Jong; Kim, Manjin; Neoh, Ke Chean; Jang, Dong Young; Kim, Hyun Joong; Shin, Jong Mok; Kim, Gyu-Tae; Shim, Joon Hyung.
In: Advanced Energy Materials, 2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - High-Performance Silver Cathode Surface Treated with Scandia-Stabilized Zirconia Nanoparticles for Intermediate Temperature Solid Oxide Fuel Cells
AU - Choi, Hyung Jong
AU - Kim, Manjin
AU - Neoh, Ke Chean
AU - Jang, Dong Young
AU - Kim, Hyun Joong
AU - Shin, Jong Mok
AU - Kim, Gyu-Tae
AU - Shim, Joon Hyung
PY - 2016
Y1 - 2016
N2 - This work introduces a novel silver composite cathode with a surface coating of scandia-stabilized zirconia (ScSZ) nanoparticles for application in intermediate temperature solid oxide fuel cells (IT-SOFCs). The ScSZ coating is expected to maximize the triple boundary area of the Ag electrode, ScSZ electrolyte, and oxygen gas, where the oxygen reduction reaction occurs. The coating also protects the porous Ag against thermal agglomeration during fuel cell operation. The ScSZ nanoparticles are prepared by sputtering scandium-zirconium alloy followed by thermal oxidation on Ag mesh. The performance of the solid oxide fuel cells with a gadolinia-doped ceria electrolyte support is evaluated. At temperatures <500 °C, our optimized Ag-ScSZ cathode outperforms the bare Ag cathode and even the platinum cathode, which has been believed to be the best material for this purpose. The highest cell peak power with the Ag-ScSZ cathode is close to 60 mW cm-2 at 450 °C, while bare Ag and optimized Pt cathodes produce 38.3 and 49.4 mW cm-2, respectively. Long-term current measurement also confirms that the Ag-ScSZ cathode is thermally stable, with less degradation than bare Ag or Pt.
AB - This work introduces a novel silver composite cathode with a surface coating of scandia-stabilized zirconia (ScSZ) nanoparticles for application in intermediate temperature solid oxide fuel cells (IT-SOFCs). The ScSZ coating is expected to maximize the triple boundary area of the Ag electrode, ScSZ electrolyte, and oxygen gas, where the oxygen reduction reaction occurs. The coating also protects the porous Ag against thermal agglomeration during fuel cell operation. The ScSZ nanoparticles are prepared by sputtering scandium-zirconium alloy followed by thermal oxidation on Ag mesh. The performance of the solid oxide fuel cells with a gadolinia-doped ceria electrolyte support is evaluated. At temperatures <500 °C, our optimized Ag-ScSZ cathode outperforms the bare Ag cathode and even the platinum cathode, which has been believed to be the best material for this purpose. The highest cell peak power with the Ag-ScSZ cathode is close to 60 mW cm-2 at 450 °C, while bare Ag and optimized Pt cathodes produce 38.3 and 49.4 mW cm-2, respectively. Long-term current measurement also confirms that the Ag-ScSZ cathode is thermally stable, with less degradation than bare Ag or Pt.
KW - Cathode
KW - Intermediate temperature
KW - Scandia-stabilized zirconia
KW - Silver
KW - Solid oxide fuel cells
UR - http://www.scopus.com/inward/record.url?scp=84995679011&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84995679011&partnerID=8YFLogxK
U2 - 10.1002/aenm.201601956
DO - 10.1002/aenm.201601956
M3 - Article
AN - SCOPUS:84995679011
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
ER -