Potential cycling effects on platinum electrocatalyst surfaces

Kinoshita, K.; Lundquist, Joseph T.; Stonehart, P.

doi:10.1016/s0022-0728(73)80257-8

Cited by 237 publications

(194 citation statements)

References 21 publications

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“…8 Tables 1 and 2). This is in agreement with Kinoshita et al [19]. The accompanying shift to higher potentials for the Pt oxide reduction with increasing particle size is in agreement with results of Takasu et al [8].…”

Section: Carbon Support Effectsupporting

confidence: 93%

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Particle size effect of carbon-supported platinum catalysts for the electrooxidation of methanol

Frelink

Visscher

Veen

1995

Journal of Electroanalytical Chemistry

335

199

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Section: Carbon Support Effectsupporting

confidence: 93%

“…Potential cycling can modify the particle size of Pt/C [19]; therefore, repeated potential cycling was applied as well on Pt/C catalysts.…”

Section: Ageing Of Catalystmentioning

confidence: 99%

Particle size effect of carbon-supported platinum catalysts for the electrooxidation of methanol

Frelink

Visscher

Veen

1995

Journal of Electroanalytical Chemistry

335

199

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“…7 On the other hand, the nature of the transient dissolution, which takes place during the rapid triangular and square wave potential cycling, 61 was not clearly understood.…”

mentioning

confidence: 99%

A Comparative Study on Gold and Platinum Dissolution in Acidic and Alkaline Media

Cherevko

Žeradjanin

Keeley

et al. 2014

J. Electrochem. Soc.

268

280

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Electrochemical dissolution of gold and platinum in 0.1 M HClO 4 , 0.1 M H 2 SO 4 , and 0.05 M NaOH is investigated. The qualitative picture of both metals' dissolution is pH-independent. Oxidation/reduction of the metal's surface leads to the transient dissolution peaks which we label A 1 and C 1 on the dissolution profiles. Commencement of the oxygen evolution reaction (OER) results in the additional dissolution peak A 2 . Quantitatively, there are important differences. The amount of gold transiently dissolved in alkaline medium is more than an order of magnitude higher in comparison to that in acidic medium. Oppositely, steady-state gold dissolution in base in the potential region of OER is hindered. The transient dissolution of platinum is by a factor of two higher in base. It is suggested that variation of the pH does not change the mechanism of the OER on platinum. Consequently, the dissolution rate of platinum is equal in acidic and alkaline electrolytes. As an explanation of the observed difference in gold dissolution, a difference in the thickness of compact oxide formed in acid and base is suggested. Growth of a thicker compact oxide in the alkaline medium explains the increased transient and the decreased steady-state dissolution of gold. Platinum and gold are perhaps the most frequently studied metals in electrochemistry. In particular, they constitute important model systems in the context of fundamental investigations of the mechanism and kinetics of the initial stages of metal oxidation. Surface processes during transition of adsorbed hydroxyl groups to, initially, compact couple of monolayers thickness and, later, relatively thick bulk phase oxides have occupied electrochemists for many decades. In the earliest works, investigations were directed toward the general problem of metal passivity, hotly debated at the beginning of the twentieth century. [1][2][3] In the 1960s and 1970s, the rapid development of fuel cells and application of platinum as a catalyst for the hydrogen oxidation and the oxygen reduction reactions (HOR and ORR) re-stimulated research efforts on noble metal oxidation. As adsorbed intermediates and other oxygenated species present on the catalyst surface were believed to have a poisoning effect on the rate of the ORR, understanding of the oxygen-platinum interaction was of substantial importance. The great progress in the development of electrochemical experimental techniques and surface analytics in these years significantly contributed to new insights of electrocatalysis at the solid-liquid interface. The understanding of noble metal oxidation is, however, not only crucial for these reactions but also the essential step in the comprehension of dissolution. Despite its importance in general and as a basis for the current work, the description of the theories and models for noble metal oxidation over the last century is beyond the scope of the present article. The interested reader is therefore referred to a comprehensive work published by Conway, and references therein. Plat...

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“…In the potential range from −0.30 V to −0.67 V, the process of the formation of adsorbed hydrogen atoms H ads at the platinum surface is recorded. After the reversal of polarization the process of hydrogen desorption is revealed on CV curve as the anodic peak at −0.58 V. As can be seen, in the successive cycles, the hydrogen desorption currents related to weakly bound hydrogen (current peak at −0.59 V) are higher and better defined than in the first cycle [17]. The anodic currents observed in the region of desorption of medium and strong bound hydrogen (currents in the range −0.55 ↔ −0.33 V) show a slight increase, however, no peaks are formed [17].…”

Section: Resultsmentioning

confidence: 90%

Investigation of Electrocatalytic Properties of Pt/Mo - Expanded Graphite Composite Derived from Graphite Intercalation Compound

Urbaniak

Skowroński

2010

Acta Phys. Pol. A

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In the present work, electrocatalytic properties of Pt-EG and Pt/Mo-EG composite electrodes are studied. These composites were prepared by a three-step synthesis. First, stage-1 HClO4-GIC was synthesized using the chronopotentiometric method. Then, HClO4-GIC was heat treated to obtain expanded graphite. Finally, expanded graphite was coated with platinum catalyst from a water-alcohol solution of H2PtCl6. MoCl5-GIC synthesized in parallel was subjected to thermal exfoliation to get Mo-EG composite onto which platinum catalyst was dispersed. The X-ray diffraction and energy dispersive X-ray analyses coupled with scanning electron microscopy were applied for characterizing the obtained GICs and EG-based composites, whereas cyclic voltammetry was used to study electrocatalytic properties of Pt/EG and Pt/Mo-EG composite electrodes in sulfuric acid and sulfuric acid admixed with methanol.

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Potential cycling effects on platinum electrocatalyst surfaces

Cited by 237 publications

References 21 publications

Particle size effect of carbon-supported platinum catalysts for the electrooxidation of methanol

Particle size effect of carbon-supported platinum catalysts for the electrooxidation of methanol

A Comparative Study on Gold and Platinum Dissolution in Acidic and Alkaline Media

Investigation of Electrocatalytic Properties of Pt/Mo - Expanded Graphite Composite Derived from Graphite Intercalation Compound

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