A PtAu nanoparticle electrocatalyst for methanol electro-oxidation in direct methanol fuel cells

Jong Ho Choi, Kyung Won Park, In Su Park, Keon Kim, Jae Suk Lee, Yung Eun Sung

Research output: Contribution to journalArticle

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Abstract

PtAu alloy nanoparticle catalysts for use in direct methanol fuel cells were synthesized by reduction with NaBH 4 and freeze-drying and their electrocatalytic activities were examined for reactions of methanol, formaldehyde, and formic acid. The extent of alloy formation and average particle size were characterized by X-ray diffraction and transmission electron microscopy. X-ray photoelectron spectra confirmed that the surface state of Au in the PtAu alloy was exclusively metallic, while the Ru in the alloy has not only metallic characteristics but is also present in oxidized form. Based on electrochemical measurements, the PtAu catalyst showed a more enhanced activity than pure Pt for the oxidation of methanol, having a lower onset potential and a larger current density. The electrocatalytic activity of the PtAu catalyst was also enhanced in the oxidation of formic acid but not formaldehyde. This provides evidence for differences in the catalytic activity of PtAu in the oxidation of low molecular weight organic compounds. The origin of the enhanced catalytic activity of the PtAu catalysts is discussed from the standpoint of a modified methanol oxidation pathway in which formaldehyde, formic acid, and CO are produced as putative intermediates.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume153
Issue number10
DOIs
Publication statusPublished - 2006 Sep 13

Fingerprint

formic acid
Direct methanol fuel cells (DMFC)
electrocatalysts
Electrooxidation
Electrocatalysts
fuel cells
Methanol
Formic acid
methyl alcohol
formaldehyde
Formaldehyde
Nanoparticles
catalysts
Oxidation
nanoparticles
oxidation
Catalysts
catalytic activity
Catalyst activity
freeze drying

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

A PtAu nanoparticle electrocatalyst for methanol electro-oxidation in direct methanol fuel cells. / Choi, Jong Ho; Park, Kyung Won; Park, In Su; Kim, Keon; Lee, Jae Suk; Sung, Yung Eun.

In: Journal of the Electrochemical Society, Vol. 153, No. 10, 13.09.2006.

Research output: Contribution to journalArticle

Choi, Jong Ho ; Park, Kyung Won ; Park, In Su ; Kim, Keon ; Lee, Jae Suk ; Sung, Yung Eun. / A PtAu nanoparticle electrocatalyst for methanol electro-oxidation in direct methanol fuel cells. In: Journal of the Electrochemical Society. 2006 ; Vol. 153, No. 10.
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AU - Sung, Yung Eun

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