Anion adsorption on Pd–Pt(111) electrodes in sulphuric acid solution

Álvarez, B.; Climent, Vı́ctor; Rodes, A.; Feliu, Juan M.

doi:10.1016/s0022-0728(00)00466-6

Cited by 79 publications

(114 citation statements)

References 76 publications

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“…Considering that the voltammetric response of the Pt(111) electrode modified with a Pd film is well established in sulfuric acid solution [11,12,16,23] [16,17,23]. A further analysis of the cyclic voltammograms in Figure 1 revealed that the hydrogen adsorption pseudocapacitance increases from 160 µC/cm 2 on unmodified Pt(111) to 320 µC/cm 2 on Pt(111) covered with 1 ML of Pd [16].…”

Section: Leis-cv Characterization Of Pt(111)-pd Surfacesmentioning

confidence: 93%

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CO adsorption and kinetics on well-characterized Pd films on Pt() in alkaline solutions

et al. 2002

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The electrochemistry of CO on a bare Pt(111) electrode as well as a Pt (111) electrode modified with pseudomorphic thin palladium films has been studied in alkaline solution by means of Fourier transform infrared (FTIR) spectroscopy. First Pd films were prepared and well characterized in UHV and subsequently transferred into the electrochemical cell for the registration of the voltammetric profiles. The charge corresponding to the formation of underpotentially deposited hydrogen (H upd ) on these Pt(111)-xPd surfaces was established in sulfuric acid solution as a function of x (0 ≤ x ≤ 1 Pd monolayer (ML)).All subsequent measurements were then performed on electrochemically deposited palladium films using the above H upd -charge vs. Pd coverage relationship to evaluate the amount of electrochemically deposited palladium. FTIR spectra for CO adsorbed on one monolayer and a submonolayer coverage are compared to those of the unmodified Pt(111) surface, all surfaces having identical 2D lattice structures. Infrared absorption bands of CO bound on either Pt(111) or Pt(111)-1ML Pd are clearly 1 distinguished. Spectra of CO adsorbed on Pd submonolayers show characteristic features of both CO bound to Pt and to Pd, indicating that on Pt(111)-xPd surfaces there is no coupling between Pt-CO ad and Pd-CO ad molecules. The kinetics of CO oxidation on these surfaces is determined either by rotating disk electrode (RDE) measurements or by FTIR spectroscopy, monitoring the CO 3 2-production. The oxidation of CO ad on Pt (111) and on Pd modified platinum surfaces starts at the same potential, ca. at 0.2 V. The oxidation rate is, however, considerably lower on the Pt(111)-xPd surfaces than on the Pt(111) surface. The kinetics of CO oxidation appears to be determined by the nature of adsorbed hydroxyl anions (OH ad ), which are more strongly (less active) adsorbed on the highly oxophilic Pd atoms.

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Section: Leis-cv Characterization Of Pt(111)-pd Surfacesmentioning

confidence: 93%

“…Only shortly after the successful UHV studies, the adsorption and catalytic properties of pseudomorphic Pd films supported on single crystal metal surfaces has also received considerable attention in the field of surface electrochemistry [10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

CO adsorption and kinetics on well-characterized Pd films on Pt() in alkaline solutions

et al. 2002

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“…The methodology employed for the Pd adlayer was similar to that previously reported [25][26][27][28][29]31]. Very briefly, both Pt(100) or Pt(111) clean surfaces were immersed at 0.10 V in a 10 )5 M PdSO 4 dissolved in 0.1 M H 2 SO 4 in meniscus configuration.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, an improvement in the electrocatalytic activity on Pt(100) electrodes modified with Pd sub-monolayers was observed, with an onset potential as low as 0.12 V. The full palladium monolayer showed a somewhat smaller catalytic activity. On Pt(111) electrodes, no significant increase in electrocatalytic activity was reported when the palladium coverage was below the monolayer range [25][26][27][28][29]. When more than a monolayer was deposited, the onset potential for formic acid oxidation shifted to more negative potentials (0.2 V).…”

Section: Introductionmentioning

confidence: 99%

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Formic acid oxidation on Pd-modified Pt(100) and Pt(111) electrodes: A DEMS study

et al. 2006

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Formic acid oxidation on palladium submonolayers on well-defined Pt(100) and Pt(111) electrodes has been studied using voltammetry and Differential Electrochemical Mass Spectrometry (DEMS). A combination of the two techniques allows a better understanding of the reaction taking place on the electrode surface. Thus, an exact correlation between the CO 2 mass signal and the current density in the voltammogram corresponding to the formic acid oxidation has been obtained. On palladium modified Pt(100) electrodes and in the potential region below 0.3 V, the currents in the positive scan are higher than those recorded in the negative scan. This diminution on the signal in the negative scan has been associated with CO 2 reduction to CO on the palladium adlayer. In addition, the CO 2 reduction reaction seems to take place on the border of the palladium islands. Finally, the adsorption of (bi)sulfate anions has an inhibiting behavior on the formic acid oxidation reaction.

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Catalysis at Bimetallic Electrochemical Interfaces

Stamenković

Marković

2009

Model Systems in Catalysis

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Anion adsorption on Pd–Pt(111) electrodes in sulphuric acid solution

Cited by 79 publications

References 76 publications

CO adsorption and kinetics on well-characterized Pd films on Pt() in alkaline solutions

CO adsorption and kinetics on well-characterized Pd films on Pt() in alkaline solutions

Formic acid oxidation on Pd-modified Pt(100) and Pt(111) electrodes: A DEMS study

Catalysis at Bimetallic Electrochemical Interfaces

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