Electrochemistry of the I-on-Pd single-crystal interface: studies by UHV-EC and in situ STM

Soriaga, Manuel P.; Schimpf, Jane A.; Carrasquillo, Arnaldo; Abreu, Juan B.; Temesghen, Woldegabr; Barriga, Raul J.; Jeng, Jiann-Jong; Sashikata, K.; Itaya, Kingo

doi:10.1016/0039-6028(95)00444-0

Cited by 37 publications

(48 citation statements)

References 15 publications

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“…[66,67] The strong binding of halides on metallic Pd surfaces suggests that halides could potentially play an important role in the chemical synthesis of Pd nanocrystals by changing the surface energy of different Pd facets. However, the studies on the effect of halide anions on the shape-controlled synthesis of Pd nanocrystals were not done until 2007 by Xia.…”

Section: Formation Of Pd Nanocubes Assisted By Halide Anionsmentioning

confidence: 99%

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

et al. 2012

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The shape control of noble metal nanocrystals is crucial to their optical properties and catalysis applications. In this Progress Report, the recent progress of shape-controlled synthesis of Pd and Pt nanostructures assisted by small adsorbates is summarized. The use of small strong adsorbates (e.g., I(-) , CO, amines) makes it possible to fabricate Pd and Pt nanostructures with not only well-defined surface structure but also morphologies that have not been achieved by other synthetic strategies. The roles of small adsorbates in shape control of Pd and Pt nanocrystals are discussed in the Report. Also presented in the Report are unique optical and catalytic properties of several Pd and Pt nanostructures (e.g., ultrathin Pd nanosheets, concave Pt octapod, concave Pd tetrahedra), as well as their bioapplications, to demonstrate the power of using small strong adsorbates in the shape control of Pt and Pd nanostructures.

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Section: Formation Of Pd Nanocubes Assisted By Halide Anionsmentioning

confidence: 99%

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

et al. 2012

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“…In this study, the surface area of the Pd electrode (1.26 cm 2 ) was taken from its geometric area with an allowance for a surface roughness factor of 1.05. A more accurate determination is hampered by the facts that, unlike Pt, there is no hydrogen chemisorption on Pd, and surface-area quantitation by adsorbed-iodine oxidation [28] results in the anodic dissolution of Pd [29].…”

Section: Methodsmentioning

confidence: 99%

The Use of Thin‐Layer Electroanalysis in the Study of the Chemisorption and Anodic Oxidation of Aromatic Molecules at Smooth Polycrystalline Palladium

2005

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Thin-layer electroanalytical chemistry has been used in the study of the chemisorption and anodic oxidation of hydroquinone and benzoquinone at smooth polycrystalline palladium electrode surfaces in aqueous sulfuric acid solutions. The results were reminiscent of those obtained previously on smooth polycrystalline platinum: i) At low aqueous-solution concentrations, the diphenol is oxidatively chemisorbed to form surface-coordinated benzoquinone oriented parallel to the surface. ii) At higher concentrations, the oxidative chemisorption occurs via CÀH activation to yield an edge-oriented diphenolic species. iii) Chemisorption from benzoquinone solutions leads to species identical to those from hydroquinone solutions. iv) The extent of anodic oxidation of the chemisorbed organic depends upon the initial adsorbed-molecule orientation: the flat-adsorbed species are oxidized completely to carbon dioxide, whereas oxidation of the edge-chemisorbed species yields other (unidentified) products that are chemisorbed upon regeneration of the oxide-free surface.

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“…On Pd, however, the strong dissolution of the metal in acidic media gives rise to problems of metal corrosion between each experiment. In this respect, Soriaga et al (21) have found a proper condition to desorb quantitatively the I-adatom from the surface in alkaline media, that is, using pH 10. It was found that the cathodic stripping of chemisorbed I from Au or Pt (16,17) is pH dependent, since it is assisted by reductive chemisorption of H leading to I -in solution from the neutral I surface species.…”

Section: Reductive Desorption Of Chemisorbed I On a Pcmentioning

confidence: 98%

“…The interaction of I with Pd and Pt electrodes was studied in different electrolyte solutions and single crystals with the help of electrochemical techniques and UHV spectroscopic ex-situ measurements (21,22). Chemisorption of an I atom on Pd is an important topic because of the I atom ability to protect the surface from air and water interactions (induced surface reconstruction).…”

Section: Introductionmentioning

confidence: 99%