Electrocatalytic Properties of Stepped Surfaces

Feliú, Juan M.; Herrero, Enrique; Climent, Vı́ctor

doi:10.1002/9780470929421.ch4

Cited by 16 publications

(13 citation statements)

References 99 publications

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“…In recent studies this interpretation is questioned due to the anomalous shift with pH of these peaks [48]. For (100) steps, presence of specifically adsorbing anions changes the shape of the voltammetric peak, signaling the possible competitive adsorption of anions on the steps [49]. In this regards, some contribution of anion specific adsorption has been suggested in perchloric acid solutions with the same pH (the peak at 0.27 V shifts to M A N U S C R I P T…”

Section: Adsorption Of the Reaction Product On Stepsmentioning

confidence: 99%

Investigation of the interfacial properties of platinum stepped surfaces using peroxodisulfate reduction as a local probe

Martínez‐Hincapié

Climent

Feliú

2019

Electrochimica Acta

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Section: Adsorption Of the Reaction Product On Stepsmentioning

confidence: 99%

Investigation of the interfacial properties of platinum stepped surfaces using peroxodisulfate reduction as a local probe

Martínez‐Hincapié

Climent

Feliú

2019

Electrochimica Acta

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“…Figure 3B shows a plot of the maximum reduction current (absolute value) measured at the lowest limit of the potential scan as a function of the step density. For this series of stepped surfaces, the step density is given by [49]:…”

Section: Resultsmentioning

confidence: 99%

Effect of surface structure of platinum single crystal electrodes on the electrochemical reduction of CO2 in methanol-water mixtures

Cárdenas

Climent

Feliu

2017

Journal of Electroanalytical Chemistry

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The reduction of CO2 on platinum single crystal electrodes has been investigated in methanol/water mixtures. The reaction is sensitive to the crystallographic structure of the surface, with the (111) triangular arrangement of atoms being the most active site. Use of stepped surfaces revealed that long range order has little effect on the reaction rate. On the other hand, the (100) site is the less active. The combination of the results of a voltammetric study using different scan rate and the use of a hanging meniscus rotating disk electrode configuration with different rotation speeds suggests the reaction rate is limited by a chemical step at large overvoltages. The nature of this chemical step is uncertain but different possibilities are discussed. The Tafel slope suggests that the rate determining step is the first electron transfer at low overvoltages while at high overvoltages the rate of the first chemical step limits the rate of CO2 reduction.

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“…Since the data were normalized with respect to surface Pt area, this implies that the specific electrocatalytic properties change during the dissolution. Changes like those in the figure may be due to the structure of the catalyst particles (development of steps, edges, and facets [30,31,32]), size effects [33,34,35], or the average distance between the catalyst particles [36] developing differently during the dissolution-redeposition process. (We attempted to take particle size effects explicitly into account in Fig.…”

Section: Resultsmentioning

confidence: 99%

Stability of carbon nanofibre-supported platinum catalysts in the presence of chloride under controlled mass-transfer conditions

Briskeby

Tsypkin

Tunold

et al. 2014

Journal of Power Sources

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The effect of chloride on the stability of platinum electrocatalysts was studied by rotating disk measurements in sulfuric acid electrolyte with a continuously increasing concentration of chloride anions. The activity towards oxygen reduction was found to be reduced by a factor of seven when 140 ppm chloride was present. Platinum corrosion was severe at high potentials, presumably accelerated by potential cycling, and greatly enhanced by mass transport. A five-fold increase in corrosion rate was found when the electrode was rotated at 1600 rpm with respect to stagnant conditions. At potentials where oxygen reduction occurs, dissolved Pt can be redeposited on the electrode. The Pt dissolution rate increased with increasing Cl -concentration up to 20 ppm. Above this threshold the corrosion rate was unaffected by increases in Cl -content.

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Electrocatalytic Properties of Stepped Surfaces

Cited by 16 publications

References 99 publications

Investigation of the interfacial properties of platinum stepped surfaces using peroxodisulfate reduction as a local probe

Investigation of the interfacial properties of platinum stepped surfaces using peroxodisulfate reduction as a local probe

Effect of surface structure of platinum single crystal electrodes on the electrochemical reduction of CO2 in methanol-water mixtures

Stability of carbon nanofibre-supported platinum catalysts in the presence of chloride under controlled mass-transfer conditions

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