Sorption of oxygen from solution by noble metals

Hoare, James P.; Thacker, Raymond; Wiese, Charles R.

doi:10.1016/0368-1874(71)85028-1

Cited by 29 publications

(28 citation statements)

References 28 publications

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“…This possibility is sustained by the fact that when platinum is strongly anodized it becomes covered by an oxide film and simultaneously oxygen dissolves in the bulk metal [11,31]. Similar results are obtained when platinum is chemically oxidized in oxygen-saturated concentrated nitric acid [38,39]. In this case it was concluded that a Pt-O alloy is formed and the structure of the latter is maintained, even when dissolved oxygen has been removed by extended periods of strong cathodization in hydrogen-saturated acid solutions.…”

Section: Introductionmentioning

confidence: 68%

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: Introductionmentioning

confidence: 68%

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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“…As fast as the Pt-O layer is reduced, it is formed again by oxygen diffusing from the dermasorbed layers (23,24) below the metal surface. With increasing current, the contribution from Pt-O reduction to the cathodic current, becomes so great that the rate of removal of the Pt-O layer is larger than the rate of formation.…”

Section: Io = (Rt/nf) (Di/d~])mentioning

confidence: 99%

Some Aspects of the Reduction of Oxygen at a Platinum‐Oxygen Alloy Diaphragm

Hoare

1979

J. Electrochem. Soc.

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The steady-state galvanostatic polarization curve was obtained on the front side of a Pt aiaphragm in contact with O~-stirred 2N H2SO4 solution while the back side was in contact with concentrated HNOs. From low oxygen overvoltage (O2-~1) measurements it is shown that the rest potential is the reversible 02 l~otential. The rate of O2 reduction on the Pt-O alloy diaphragm is lower at high current densities than on a bright Pt cathode. At very high current densities the system is driven into the H2-evolution region where the H2-~ is close to the literature values for the Hf-TI on bright Pt. When the system was returned to open-circuit, the rest potential returned to the normal oxygen potential after about 24 hr. This time delay represents the time required to repair the complete layer of adsorbed oxygen atoms which had been removed by the strong cathodic current.

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“…The formation of platinum oxide and oxides of other noble metals has often been studied in the presence of gas phase oxygen (1-3) and at metal surfaces in aqueous solution (4)(5)(6).…”

Section: Introductionmentioning

confidence: 99%

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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Sorption of oxygen from solution by noble metals

Cited by 29 publications

References 28 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

Some Aspects of the Reduction of Oxygen at a Platinum‐Oxygen Alloy Diaphragm

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

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