Atomic layer deposition of ruthenium surface-coating on porous platinum catalysts for high-performance direct ethanol solid oxide fuel cells

Heon Jae Jeong, Jun Woo Kim, Dong Young Jang, Joon Hyung Shim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Pt-Ru bi-metallic catalysts are synthesized by atomic layer deposition (ALD) of Ru surface-coating on sputtered Pt mesh. The catalysts are evaluated in direct ethanol solid oxide fuel cells (DESOFCs) in the temperature range of 300-500 °C. Island-growth of the ALD Ru coating is confirmed by transmission electron microscopy and X-ray photoelectron spectroscopy (XPS) analyses. The performance of the DESOFCs is evaluated based on the current-voltage output and electrochemical impedance spectroscopy. Genuine reduction of the polarization impedance, and enhanced power output with improved surface kinetics are achieved with the optimized ALD Ru surface-coating compared to bare Pt. The chemical composition of the Pt/ALD Ru electrode surface after fuel cell operation is analyzed via XPS. Enhanced cell performance is clearly achieved, attributed to the effective Pt/ALD Ru bi-metallic catalysis, including oxidation of CO by Ru, and de-protonation of ethanol and cleavage of C-C bonds by Pt, as supported by surface morphology analysis which confirms formation of a large amount of carbon on bare Pt after the ethanol-fuel-cell test.

Original languageEnglish
Pages (from-to)239-245
Number of pages7
JournalJournal of Power Sources
Volume291
DOIs
Publication statusPublished - 2015 May 19

Fingerprint

Direct ethanol fuel cells (DEFC)
Ruthenium
Atomic layer deposition
solid oxide fuel cells
atomic layer epitaxy
Platinum
Solid oxide fuel cells (SOFC)
ruthenium
platinum
ethyl alcohol
coatings
catalysts
Coatings
Catalysts
fuel cells
Fuel cells
X ray photoelectron spectroscopy
photoelectron spectroscopy
impedance
Ethanol fuels

Keywords

  • Atomic layer deposition
  • Direct ethanol solid oxide fuel cells
  • Heterogeneous catalysts
  • Platinum
  • Ruthenium

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

Atomic layer deposition of ruthenium surface-coating on porous platinum catalysts for high-performance direct ethanol solid oxide fuel cells. / Jeong, Heon Jae; Kim, Jun Woo; Jang, Dong Young; Shim, Joon Hyung.

In: Journal of Power Sources, Vol. 291, 19.05.2015, p. 239-245.

Research output: Contribution to journalArticle

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