Nanoporous silver cathode surface-treated by aerosol-assisted chemical vapor deposition of gadolinia-doped ceria for intermediate-temperature solid oxide fuel cells

Hyeon Rak Choi, Ke Chean Neoh, Hyung Jong Choi, Gwon Deok Han, Dong Young Jang, Daejoong Kim, Joon Hyung Shim

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)246-251
Number of pages6
JournalJournal of Power Sources
Volume402
DOIs
Publication statusPublished - 2018 Oct 31

Fingerprint

Gadolinium
Cerium compounds
solid oxide fuel cells
gadolinium
Solid oxide fuel cells (SOFC)
Aerosols
Silver
Chemical vapor deposition
aerosols
Cathodes
cathodes
silver
vapor deposition
coatings
Coatings
Temperature
temperature
High resolution transmission electron microscopy
agglomeration
Platinum

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 journalArticle

Choi, Hyeon Rak ; Neoh, Ke Chean ; Choi, Hyung Jong ; Han, Gwon Deok ; Jang, Dong Young ; Kim, Daejoong ; Shim, Joon Hyung. / Nanoporous silver cathode surface-treated by aerosol-assisted chemical vapor deposition of gadolinia-doped ceria for intermediate-temperature solid oxide fuel cells. In: Journal of Power Sources. 2018 ; Vol. 402. pp. 246-251.
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