Abstract
Herein, a nanoporous silver surface treated with gadolinia-doped ceria (GDC) is evaluated as a cathode for intermediate-temperature solid oxide fuel cells operating below 500 °C. For uniform surface treatment on the porous silver, aerosol-assisted chemical vapor deposition (AACVD) is used; it is a non-vacuum process and is considered as an economical alternative to the expensive vacuum-environment thin-film fabrication methods. Consequently, a uniform coating of AACVD GDC on the Ag surface is successfully achieved, which is confirmed by high-resolution transmission electron microscopy. The optimized amount of AACVD GDC enhances fuel cell performance compared to cells with bare Ag, in terms of the power and long-term stability measured by current–voltage characteristics, electrochemical impedance spectroscopy, and potentiostatic amperometry. This performance is even more significant than that from the cell with a platinum cathode, which, to our best knowledge, is known as the best-performing catalyst for solid oxide fuel cells in the intermediate- and low-temperature regimes. The power enhancement is attributed to the improved kinetics with the GDC surface coating; moreover, this oxide decoration is proven effective in preventing the thermal agglomeration of Ag, as confirmed by the morphology comparison before and after the long-term test.
| Original language | English |
|---|---|
| Pages (from-to) | 246-251 |
| Number of pages | 6 |
| Journal | Journal of Power Sources |
| Volume | 402 |
| DOIs | |
| Publication status | Published - 2018 Oct 31 |
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Keywords
- Aerosol-assisted chemical vapor deposition
- Cathode
- Gadolinia-doped ceria
- Silver
- Solid oxide fuel cells
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering
Cite this
Nanoporous silver cathode surface-treated by aerosol-assisted chemical vapor deposition of gadolinia-doped ceria for intermediate-temperature solid oxide fuel cells. / Choi, Hyeon Rak; Neoh, Ke Chean; Choi, Hyung Jong; Han, Gwon Deok; Jang, Dong Young; Kim, Daejoong; Shim, Joon Hyung.
In: Journal of Power Sources, Vol. 402, 31.10.2018, p. 246-251.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nanoporous silver cathode surface-treated by aerosol-assisted chemical vapor deposition of gadolinia-doped ceria for intermediate-temperature solid oxide fuel cells
AU - Choi, Hyeon Rak
AU - Neoh, Ke Chean
AU - Choi, Hyung Jong
AU - Han, Gwon Deok
AU - Jang, Dong Young
AU - Kim, Daejoong
AU - Shim, Joon Hyung
PY - 2018/10/31
Y1 - 2018/10/31
N2 - Herein, a nanoporous silver surface treated with gadolinia-doped ceria (GDC) is evaluated as a cathode for intermediate-temperature solid oxide fuel cells operating below 500 °C. For uniform surface treatment on the porous silver, aerosol-assisted chemical vapor deposition (AACVD) is used; it is a non-vacuum process and is considered as an economical alternative to the expensive vacuum-environment thin-film fabrication methods. Consequently, a uniform coating of AACVD GDC on the Ag surface is successfully achieved, which is confirmed by high-resolution transmission electron microscopy. The optimized amount of AACVD GDC enhances fuel cell performance compared to cells with bare Ag, in terms of the power and long-term stability measured by current–voltage characteristics, electrochemical impedance spectroscopy, and potentiostatic amperometry. This performance is even more significant than that from the cell with a platinum cathode, which, to our best knowledge, is known as the best-performing catalyst for solid oxide fuel cells in the intermediate- and low-temperature regimes. The power enhancement is attributed to the improved kinetics with the GDC surface coating; moreover, this oxide decoration is proven effective in preventing the thermal agglomeration of Ag, as confirmed by the morphology comparison before and after the long-term test.
AB - Herein, a nanoporous silver surface treated with gadolinia-doped ceria (GDC) is evaluated as a cathode for intermediate-temperature solid oxide fuel cells operating below 500 °C. For uniform surface treatment on the porous silver, aerosol-assisted chemical vapor deposition (AACVD) is used; it is a non-vacuum process and is considered as an economical alternative to the expensive vacuum-environment thin-film fabrication methods. Consequently, a uniform coating of AACVD GDC on the Ag surface is successfully achieved, which is confirmed by high-resolution transmission electron microscopy. The optimized amount of AACVD GDC enhances fuel cell performance compared to cells with bare Ag, in terms of the power and long-term stability measured by current–voltage characteristics, electrochemical impedance spectroscopy, and potentiostatic amperometry. This performance is even more significant than that from the cell with a platinum cathode, which, to our best knowledge, is known as the best-performing catalyst for solid oxide fuel cells in the intermediate- and low-temperature regimes. The power enhancement is attributed to the improved kinetics with the GDC surface coating; moreover, this oxide decoration is proven effective in preventing the thermal agglomeration of Ag, as confirmed by the morphology comparison before and after the long-term test.
KW - Aerosol-assisted chemical vapor deposition
KW - Cathode
KW - Gadolinia-doped ceria
KW - Silver
KW - Solid oxide fuel cells
UR - http://www.scopus.com/inward/record.url?scp=85053790921&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053790921&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2018.09.031
DO - 10.1016/j.jpowsour.2018.09.031
M3 - Article
VL - 402
SP - 246
EP - 251
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -