Nanoporous silver cathodes surface-treated by atomic layer deposition of Y: ZrO<inf>2</inf> for high-performance low-temperature solid oxide fuel cells

You Kai Li, Hyung Jong Choi, Ho Keun Kim, Neoh Ke Chean, Manjin Kim, Junmo Koo, Heon Jae Jeong, Dong Young Jang, Joon Hyung Shim

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Abstract We report high-performance solid-oxide fuel cells (SOFCs) with silver cathodes surface-treated using yttria-stabilized zirconia (YSZ) nano-particulates fabricated by atomic layer deposition (ALD). Fuel cell tests are conducted on gadolinia-doped ceria electrolyte pellets with a platinum anode at 250-450 °C. In our tests, the fuel cell performance of the SOFCs with an optimized ALD YSZ surface treatment is close to that of SOFCs with porous Pt, which is known as the best performing catalyst in the low-temperature regime. Electrochemical impedance spectroscopy confirms that the performance enhancement is due to improved electrode kinetics by the increase in charge transfer reaction sites between the surface of supporting silver and the ALD-YSZ particulates. Fuel cell durability tests shows that the ALD YSZ surface treatment improves the long-term stability. X-ray photoelectron spectroscopy also confirms that the ALD YSZ capping prevents reduction of the surface silver oxide and destruction of the mesh morphology.

Original languageEnglish
Article number21420
Pages (from-to)175-181
Number of pages7
JournalJournal of Power Sources
Volume295
DOIs
Publication statusPublished - 2015 Jul 14

Fingerprint

Atomic layer deposition
Yttria stabilized zirconia
solid oxide fuel cells
atomic layer epitaxy
yttria-stabilized zirconia
Solid oxide fuel cells (SOFC)
Silver
Cathodes
cathodes
silver
fuel cells
Fuel cells
surface treatment
particulates
Surface treatment
Temperature
Silver oxides
silver oxides
Gadolinium
Cerium compounds

Keywords

  • Atomic layer deposition
  • Cathode
  • Silver
  • Solid oxide fuel cells
  • Yttria-stabilized zirconia

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Nanoporous silver cathodes surface-treated by atomic layer deposition of Y : ZrO<inf>2</inf> for high-performance low-temperature solid oxide fuel cells. / Li, You Kai; Choi, Hyung Jong; Kim, Ho Keun; Chean, Neoh Ke; Kim, Manjin; Koo, Junmo; Jeong, Heon Jae; Jang, Dong Young; Shim, Joon Hyung.

In: Journal of Power Sources, Vol. 295, 21420, 14.07.2015, p. 175-181.

Research output: Contribution to journalArticle

Li, You Kai ; Choi, Hyung Jong ; Kim, Ho Keun ; Chean, Neoh Ke ; Kim, Manjin ; Koo, Junmo ; Jeong, Heon Jae ; Jang, Dong Young ; Shim, Joon Hyung. / Nanoporous silver cathodes surface-treated by atomic layer deposition of Y : ZrO<inf>2</inf> for high-performance low-temperature solid oxide fuel cells. In: Journal of Power Sources. 2015 ; Vol. 295. pp. 175-181.
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N2 - Abstract We report high-performance solid-oxide fuel cells (SOFCs) with silver cathodes surface-treated using yttria-stabilized zirconia (YSZ) nano-particulates fabricated by atomic layer deposition (ALD). Fuel cell tests are conducted on gadolinia-doped ceria electrolyte pellets with a platinum anode at 250-450 °C. In our tests, the fuel cell performance of the SOFCs with an optimized ALD YSZ surface treatment is close to that of SOFCs with porous Pt, which is known as the best performing catalyst in the low-temperature regime. Electrochemical impedance spectroscopy confirms that the performance enhancement is due to improved electrode kinetics by the increase in charge transfer reaction sites between the surface of supporting silver and the ALD-YSZ particulates. Fuel cell durability tests shows that the ALD YSZ surface treatment improves the long-term stability. X-ray photoelectron spectroscopy also confirms that the ALD YSZ capping prevents reduction of the surface silver oxide and destruction of the mesh morphology.

AB - Abstract We report high-performance solid-oxide fuel cells (SOFCs) with silver cathodes surface-treated using yttria-stabilized zirconia (YSZ) nano-particulates fabricated by atomic layer deposition (ALD). Fuel cell tests are conducted on gadolinia-doped ceria electrolyte pellets with a platinum anode at 250-450 °C. In our tests, the fuel cell performance of the SOFCs with an optimized ALD YSZ surface treatment is close to that of SOFCs with porous Pt, which is known as the best performing catalyst in the low-temperature regime. Electrochemical impedance spectroscopy confirms that the performance enhancement is due to improved electrode kinetics by the increase in charge transfer reaction sites between the surface of supporting silver and the ALD-YSZ particulates. Fuel cell durability tests shows that the ALD YSZ surface treatment improves the long-term stability. X-ray photoelectron spectroscopy also confirms that the ALD YSZ capping prevents reduction of the surface silver oxide and destruction of the mesh morphology.

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