UPD metal electrocatalysis of formic acid oxidation at teflon-bonded carbon substrate electrodes

Luna, A. Castro; Iwasita, T.; Vielstich, W.

doi:10.1016/0022-0728(85)80029-2

Cited by 35 publications

(3 citation statements)

References 17 publications

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“…Contrary to the oxidation of formic acid and formaldehyde, methanol oxidation to CO 2 requires an oxygen-containing species. Previous investigations 45 have shown that Pb or Bi adatoms on Pt do not exhibit catalytic activity towards the oxidation of adsorbed residues formed from formic acid. Similarly, the PtPb intermetallic compound does not exhibit catalytic activity towards the oxidation of adsorbed CO (Fig.…”

Section: Catalytic Mechanism Of Ptpb and Ptbi Intermetallic Electrodesmentioning

confidence: 89%

Electrocatalytic mechanism and kinetics of SOMs oxidation on ordered PtPb and PtBi intermetallic compounds: DEMS and FTIRS study

Wang

Alden

DiSalvo

et al. 2008

Phys. Chem. Chem. Phys.

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The electrocatalytic activities and mechanisms of PtPb and PtBi ordered intermetallic phases towards formic acid, formaldehyde and methanol oxidation have been studied by DEMS and FTIRS, and the results compared to those for a pure polycrystalline platinum electrode. While PtPb exhibits an enhanced electrocatalytic activity for the oxidation of all three organic molecules when compared to a Pt electrode, PtBi exhibits an enhanced catalytic activity towards formic acid and formaldehyde oxidation, but not methanol. FTIRS data indicate that adsorbed CO does not form on PtPb or PtBi intermetallic compounds during the oxidation of formic acid, formaldehyde and methanol, and therefore their oxidation on both PtPb and PtBi intermetallic compounds proceeds via a non-CO(ads) pathway. Quantitative DEMS measurements indicate that only CO(2) was detected as a final product during formic acid oxidation on Pt, PtPb and PtBi electrodes. At a smooth polycrystalline platinum electrode, the oxidation of formaldehyde and methanol produces mainly intermediates (formaldehyde and formic acid), while CO(2) is a minor product. In contrast, CO(2) is the major product for formaldehyde and methanol oxidation at a PtPb electrode. The high current efficiency of CO(2) formation for methanol and formaldehyde oxidation at a PtPb electrode can be ascribed to the complete dehydrogenation of formaldehyde and formic acid due to electronic effects. The low onset potential, high current density and high CO(2) yield make PtPb one of the most promising electrocatalysts for fuel cell applications using small organic molecules as fuels.

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Section: Catalytic Mechanism Of Ptpb and Ptbi Intermetallic Electrodesmentioning

confidence: 89%

Electrocatalytic mechanism and kinetics of SOMs oxidation on ordered PtPb and PtBi intermetallic compounds: DEMS and FTIRS study

Wang

Alden

DiSalvo

et al. 2008

Phys. Chem. Chem. Phys.

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“…The oxidation of formic acid at platinum in the presence of foreign adatoms is one of the most studied subjects in electrocatalysis of organic oxidations. − This reaction may be considered as a model to understand the oxidation of more complex organic species on these electrodes. Current enhancements up to a factor of 70 for lead adatoms at polycrystalline Pt 17 and 40 for Bi at Pt(111) 6 have been reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adatoms in the Electrocatalysis of HCOOH Oxidation. A Theoretical Model

et al. 1997

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A simple model for simulating the electrooxidation of HCOOH on single crystal surfaces of Pt catalyzed by adatoms is presented. The substrate is represented as a square or hexagonal array of lattice points, which may be occupied by adatoms or poisoning species. Analytic expressions for the oxidation current as a function of the adatom coverage are given. Third body effects as well as real improvement of the catalytic activity are analyzed. The model fits satisfactorily some experimental data for the electrooxidation of formic acid on Pt/adatoms systems.

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“…They postulated that adsorbed tin hindered the formation of organic residues ("poisons") by blocking platinum sites. However, this explanation is also challenged [14,[28][29]. Two recent papers support the mechanism of…”

mentioning

confidence: 99%

Electrochemical oxidation of methanol on tin-modified platinum single-crystal surfaces

Haner¹,

Ross²

1991

J. Phys. Chem.

124

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UPD metal electrocatalysis of formic acid oxidation at teflon-bonded carbon substrate electrodes

Cited by 35 publications

References 17 publications

Electrocatalytic mechanism and kinetics of SOMs oxidation on ordered PtPb and PtBi intermetallic compounds: DEMS and FTIRS study

Electrocatalytic mechanism and kinetics of SOMs oxidation on ordered PtPb and PtBi intermetallic compounds: DEMS and FTIRS study

Effect of Adatoms in the Electrocatalysis of HCOOH Oxidation. A Theoretical Model

Electrochemical oxidation of methanol on tin-modified platinum single-crystal surfaces

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