Concerning the structure of platinum—oxygen alloys

Hoare, James P.

doi:10.1016/0013-4686(81)85007-4

Cited by 20 publications

(15 citation statements)

References 13 publications

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“…Trace (a) shows the peaks of pure polycrystalline platinum. They correspond to reflexions from the (111), (200), (220) and (311) planes [40]. Trace (b) shows a remarkable intensity increase of the peak related to the (l 1 l) plane.…”

Section: Voltamperometric Charactertsttcs Of a Platinum Electrode Aftmentioning

confidence: 93%

Changes in the electrochemical response of noble metals produced by square-wave potential perturbations

Chialvo

Triaca

Arvía

1983

Journal of Electroanalytical Chemistry and Interfacial Electroc

144

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A square-wave potentaat anodizing procedure to obtain noble metal surfaces with both a controlled roughness and a reproducable electrochemacal response is presented. The influence of the charactenstacs of the square-wave potentaal perturbauon are systematxcally stu&ed. The mo&ficataon of the surface takes place through the formation of a hydrated platinum oxade layer wluch is later electroreduced. The mechamsm of growth of the hydrated oxide layer under both square-wave potentml perturbation and potentaostatac conditions ~s critically &scussed m terms of a complex sandwich-type structure.

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Section: Voltamperometric Charactertsttcs Of a Platinum Electrode Aftmentioning

confidence: 93%

Changes in the electrochemical response of noble metals produced by square-wave potential perturbations

Chialvo

Triaca

Arvía

1983

Journal of Electroanalytical Chemistry and Interfacial Electroc

144

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“…This result does not depend dramatically on the chosen pressure of lo-6 Torr. At lo-1 Torr, for example, the temperatures at which the oxides would decompose are increased at most by 200 K. In spite of this thermodynamic instability, penetration of oxygen into the bulk (4,(27)(28)(29)(30)(31)(32)46) and the formation of oxides in the near surface region of the noble metals has been reported in many surface studies. These include the surfaces of Ir(llO) (17), Ir(lll) (16), Pt(lll) (8,(10)(11)(12)(13)33), Pt(lOO) (13), Pt(llO) (9,12), Rh(lll) (18), Pd(lll) (19), polycrystalline Pd (32), Ru(lOl) (31), and Au(lll) (20).…”

Section: Discussionmentioning

confidence: 99%

“…The oxidized surfaces exhibit unique chemical properties that are frequently utilized in heterogeneous catalysis (7)(8)(9) and for electrode reactions (4). There are many reports of platinum oxide formation in the near surface region of metal single crystals in high vacuum surface studies (10-13).…”

Section: Introductionmentioning

confidence: 99%

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The structure and stability of surface platinum oxide and of oxides of other noble metals

1981

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The formation and stability of surface layers of platinum oxides in platinum single crystals has been studied in ultrahigh vacuum. Low energy electron diffraction (LEED) was used to identify the ordered structures that formed on the surface of Pt(lll), Pt(332), and Pt(llO). It appears that these structures can be related to hexagonal planes of.Pt02• The cleanliness of the surface was monitored by Auger electron spectroscopy (AES). The presence of impurities like Ca and Si must be avoided as they oxidize preferentially to the Pt. It is shown that the Pt oxide layers are stabilized by the very slow kinetics of oxygen diffusion to the surface which is responsible for the observed long life of the oxide layers under most catalytic reactions that are carried out at temperatures below 500°C. The stability of other oxides of·noble metals that have been observed in UHV studies is also reviewed.

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“…However, for 60 min of CT, there is a higher stability of the new surface, since it attains a plateau after 1350 s (not shown). Hoare [71] has shown that large values of opencircuit potentials can be observed when derm-adsorbed oxygen is prepared after very long-lasting anodization on platinum. Our results showed, then, that the saturation value of ca.…”

Section: Open-circuit Potential Decays For Ct-treated Platinum In Acimentioning

confidence: 98%

Catalytic effects on methanol oxidation produced by cathodization of platinum electrodes

Díaz

Zinola

2007

Journal of Colloid and Interface Science

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Concerning the structure of platinum—oxygen alloys

Cited by 20 publications

References 13 publications

Changes in the electrochemical response of noble metals produced by square-wave potential perturbations

Changes in the electrochemical response of noble metals produced by square-wave potential perturbations

The structure and stability of surface platinum oxide and of oxides of other noble metals

Catalytic effects on methanol oxidation produced by cathodization of platinum electrodes

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