Tailoring properties of platinum supported catalysts by irreversible adsorbed adatoms toward ethanol oxidation for direct ethanol fuel cells

Marta C. Figueiredo, Annukka Santasalo-Aarnio, Francisco J. Vidal-Iglesias, José Solla-Gullón, Juan M. Feliu, Kyosti Kontturi, Tanja Kallio (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

In this work ethanol oxidation on carbon supported Pt catalysts modified with irreversibly adsorbed adatoms is reported. This study concerns understanding of the effect of a second metal on real catalysts in conditions as close as possible to those applied in fuel cells systems. The results were acquired using cyclic voltammetry, chronoamperometry and in situ infra-red techniques always taking into account the future application of the electrocatalyst materials in fuel cells. Foreign adatoms, both Bi and Sb, irreversibly adsorbed on a Pt electrode were studied, and revealed to enhance catalytic activity toward a more efficient ethanol oxidation. The catalytic enhancement continuously increased with the coverage of the adatom on the surface up to coverages close to saturation. With these high coverages a decrease of the activity was observed suggesting that free platinum atoms are required to oxidize ethanol. The results suggest that the adatoms play a third body role avoiding the poisoning of the Pt sites that will then be free for oxidizing ethanol. However, electronic effects on Pt/C-Bi and bifunctional mechanism at Pt/C-Sb are also suggested. The oxidation products were identified by in situ FTIR and are mainly acetaldehyde and acetic acid for the three catalysts. CO2 was also observed for the unmodified Pt/C and interestingly for the Pt/C-Sb electrodes.

Original languageEnglish
Pages (from-to)378-385
Number of pages8
JournalApplied Catalysis. B, Environmental
Volume140-141
DOIs
Publication statusPublished - 1 Aug 2013
Externally publishedYes

Fingerprint

Direct ethanol fuel cells (DEFC)
Adatoms
fuel cell
Platinum
platinum
Catalyst supports
ethanol
Ethanol
catalyst
oxidation
Oxidation
Fuel cells
electrode
Chronoamperometry
Electrodes
Catalysts
Acetaldehyde
acetaldehyde
Electrocatalysts
poisoning

Keywords

  • Adatoms
  • Direct ethanol fuel cells (DEFCs)
  • Electrocatalysis
  • Ethanol oxidation
  • Platinum

Cite this

Figueiredo, Marta C. ; Santasalo-Aarnio, Annukka ; Vidal-Iglesias, Francisco J. ; Solla-Gullón, José ; Feliu, Juan M. ; Kontturi, Kyosti ; Kallio, Tanja. / Tailoring properties of platinum supported catalysts by irreversible adsorbed adatoms toward ethanol oxidation for direct ethanol fuel cells. In: Applied Catalysis. B, Environmental. 2013 ; Vol. 140-141. pp. 378-385.
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Tailoring properties of platinum supported catalysts by irreversible adsorbed adatoms toward ethanol oxidation for direct ethanol fuel cells. / Figueiredo, Marta C.; Santasalo-Aarnio, Annukka; Vidal-Iglesias, Francisco J.; Solla-Gullón, José; Feliu, Juan M.; Kontturi, Kyosti; Kallio, Tanja (Corresponding author).

In: Applied Catalysis. B, Environmental, Vol. 140-141, 01.08.2013, p. 378-385.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Tailoring properties of platinum supported catalysts by irreversible adsorbed adatoms toward ethanol oxidation for direct ethanol fuel cells

AU - Figueiredo, Marta C.

AU - Santasalo-Aarnio, Annukka

AU - Vidal-Iglesias, Francisco J.

AU - Solla-Gullón, José

AU - Feliu, Juan M.

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AU - Kallio, Tanja

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