Leed / auger verification of the in situ method of preparation of Pt (111) single crystal electrodes

Wasberg, M.; Palaikis, L.; Wallen, Scott L.; Kamrath, Michael Z.; Wiȩckowski, Andrzej

doi:10.1016/0022-0728(88)85006-x

Cited by 69 publications

(16 citation statements)

References 33 publications

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“…2 and 4. Early LEED studies of electrosorbed CO on Pt͑111͒ found saturation structures, which were labeled c͑ ͱ 3 ϫ 3͒rect, 20,31 but can now be identified as ͑ ͱ 19ϫ ͱ 19͒-13CO. 7,9 In the case of only short exposures to UHV, Ref.…”

Section: "2 ã 2…-3co Structurementioning

confidence: 99%

High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressure

et al. 2007

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We report structure studies of high-density CO monolayers on Pt͑111͒ surfaces in equilibrium with gaseous CO near atmospheric pressure, using surface x-ray scattering ͑SXS͒ and scanning tunneling microscopy ͑STM͒. We were able to stabilize extremely well-ordered CO monolayers by emersion transfer from an electrochemical cell. We found the hexagonal close-packed ͑2 ϫ 2͒-3CO structure at room temperature in ϳ1 atm CO gas pressure. We also confirm the ͑ ͱ 19ϫ ͱ 19͒-13CO structure previously proposed in STM studies ͓Vestergaard et al., Phys. Rev. Lett. 88, 259601 ͑2002͔͒. Based on SXS and STM measurements, a tentative phase diagram is proposed. Detailed SXS structure studies of the ͑2 ϫ 2͒-3CO structure suggest a surface structure and substrate reconstruction less symmetric than previously studies suggested. We also find that ͑ ͱ 19ϫ ͱ 19͒-13CO structure induces substrate reconstructions including the dimerization of Pt bonded to bridging CO and the rotation of the Pt cluster with atop CO.

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Section: "2 ã 2…-3co Structurementioning

confidence: 99%

High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressure

et al. 2007

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“…3 shows stripping voltammograms of poison produced on rotating Pt electrodes at 0.13 V under a chronoamperometric condition. Specifically, an iodine solution (~0.1 mL) of 0.1 M was injected into a formic acid solution (~100 mL) at 2400 sec after a potential jump from −0.23 V to 0.13 V. The injected iodide adsorbs bare Pt sites without replacing the already existing poison to prevent further adsorption of formic acid [11,12], so that the oxidation of formic acid was completely prevented as exemplified by the sudden current drop at 2400 sec in Fig. 2(a).…”

Section: Resultsmentioning

confidence: 99%

Formic Acid Oxidation Depending on Rotating Speed of Smooth Pt Disk Electrode

Shin

Kim

Choi

et al. 2014

Journal of Electrochemical Science and Technology

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This work presents the variation of formic acid oxidation on Pt depending on hydrodynamic condition using a rotating disk electrode. As the rotating speed increases, the oxidation rate of formic acid decreases under voltammetric and chronoamperometric measurements. The coverages of poison formed from formic acid during the chronoamperomertric investigations decrease when the rotating speed increases. As the roughness factor of Pt electrode surface increases, on the other hand, the current density of formic acid oxidation increases. These observations are discussed in terms of the tangential flow along Pt electrode surfaces generated by the rotating disk electrode, which reduces a contact time between formic acid and a Pt site, thus the formic acid adsorption.

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“…as reported earlier (45). The Au sample was cleaned by 340 eV Ar + ion bombardment and annealing at 650 K, until the Auger electron spectrum and LEED showed a clean and ordered sample.…”

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confidence: 99%

Adsorption of Bisulfate Anion on the Au(111), Pt(111), and Rh(111) Surfaces

Thomas

Sung

Wiȩckowski

1997

ACS Symposium Series

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We report on adsorption of bisulfate anion on the Au(111), Pt(111), and Rh(111) electrodes in sulfuric acid media using electrochemistry, Auger electron spectroscopy, low energy electron diffraction and core--level electron energy loss spectroscopy. The key observations for the bisulfate adsorbate on all surfaces studied are: (i) the oxygen-to-sulfur ratio is 4, (ii) the S(LMM) Auger electron transitions and S2p energy loss spectra show signatures characteristic of the sulfate anion, (iii) the spectral data are typical of the S 6+ valency in the adsorbate. These results indicate that no decomposition or dehydration of the adsorbed anion occur in UHV. On Pt(111) and Rh(111) the maximum anion coverage is very close to 1/3 of the monolayer (ML). This is in an excellent agreement with the Me(111)(√3 x √3)R30° from electron diffraction. For Au(111), the maximum coverage is 1/5 ML while the diffraction data indicate a diffuse Au(√3 x √3)R30° structure. Whereas in the specific case of the Au(111) electrode the low energy electron diffraction data provide only an indirect basis for structural assignment of the sulfate adsorbate, we may conclude from these data that the structure of bisulfate on gold is different from that on Pt(111) and Rh(111). The core level energy loss spectra show that the electron density on surface sulfur is higher than in the salt, evidently due to backdonation of electrons from the substrate to the adsorbate. To complete the description of the anion-surface chemical bond requires the assessment of the electron donation contribution to the bond. This will be interrogated in a separate study.Anions, together with cations and solvent molecules, are building blocks of the boundary layer that develops in the interface between metal and electrolytic solution. When specifically adsorbed, they alter the charge distribution at the interface and the

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Leed / auger verification of the in situ method of preparation of Pt (111) single crystal electrodes

Cited by 69 publications

References 33 publications

High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressure

High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressure

Formic Acid Oxidation Depending on Rotating Speed of Smooth Pt Disk Electrode

Adsorption of Bisulfate Anion on the Au(111), Pt(111), and Rh(111) Surfaces

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