Investigations of hydrogen ionization on platinum with the help of micro-electrodes

Bagotzky, V.S.; Osetrova, N. V.

doi:10.1016/s0022-0728(73)80494-2

Cited by 61 publications

(83 citation statements)

References 14 publications

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“…Mathematically, this can be understood as simply add- [18], SECM [19,20], ultramicroelectrode [21,22], solid state cell [23], floating vaccum filtered catalyst electrode [24], low loading RDE [25]. Reprinted with permission from Ref.…”

Section: Mechanism Of the Catalytic Processmentioning

confidence: 99%

Electrocatalysts for hydrogen oxidation and evolution reactions

Zhuang

2016

Sci. China Mater.

152

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Section: Mechanism Of the Catalytic Processmentioning

confidence: 99%

Electrocatalysts for hydrogen oxidation and evolution reactions

Zhuang

2016

Sci. China Mater.

152

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“…The activity of Pt (110) facets was considerably larger that for the other single-crystal surfaces, and almost matched the results obtained by other authors for polycrystalline Pt in alkaline electrolytes (KOH and NaOH). 17,26,39 Their model describes the kinetic data and the trends observed reasonably well, but it has some difficulties in explaining the large activity obtained on the (110) orientation when compared with (100) and (111) orientations, in the presence of Pt surfaces fully covered by adsorbed species.…”

Section: F1308mentioning

confidence: 99%

Pt/C/Ni(OH)₂Bi-Functional Electrocatalyst for Enhanced Hydrogen Evolution Reaction Activity under Alkaline Conditions

Wang

Parrondo

et al. 2017

J. Electrochem. Soc.

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The kinetics of hydrogen evolution and hydrogen oxidation reactions (HER/HOR) in alkaline electrolyte on Pt/C and a Pt/C/Ni(OH) 2 bi-functional electrocatalyst were studied. The objective was to investigate the enhancement of hydrogen evolution activity of Pt in alkaline environments in presence of transition metal hydroxides, and to determine the optimum concentration of Ni(OH) 2 to be added to maximize catalytic activity. The catalysts were prepared by mixing colloidal dispersions of nanosized Ni(OH) 2 with a commercially-sourced Pt/C catalyst dispersed in water. Rotating disk electrode (RDE) measurements were performed in 0.1 M KOH at temperatures ranging from 273.15 K to 303.15 K, and the HOR/HER kinetic currents, obtained after IR and mass transport corrections, were fitted using the Butler-Volmer equation to estimate the exchange current densities at each temperature. Arrhenius plots showed very similar activation energies for Pt/C (35 ± 6 kJ/mol) and the bi-functional catalysts (38 ± 6 kJ/mol) -Pt/C/X%Ni(OH) 2 . The maximum exchange current density (2.44 ± 0.07 mA cm −2 Pt at 303.15 K) was obtained with the catalyst containing 10 wt% Ni(OH) 2 , and was 2.4 times higher than for Pt/C (1.03 ± 0.07 mA cm −2 Pt at 303.15 K). The bi-functional catalysts were evaluated in a hydroxide-exchange membrane water electrolyzer operated with ultrapure water, and outperformed Pt/C by about 0.15 V across the entire current density range.

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“…It is well known that, due to these ultra-fast kinetics, the study of the HOR in acidic electrolytes on Pt-surfaces requires tools enabling extremely high mass transport rates such as the H 2 pump, 56,67,68 scanning electrochemical microscopy, 69,70 or micro-electrodes, 71 with a recent review given in Reference 72. Thus, while the model accurately represents the diffusion-controlled polarization curves expected for Table I for different inlet flow rates.…”

Section: Resultsmentioning

confidence: 99%

Numerical Partitioning Model for the Koutecký-Levich Analysis of Electrochemical Flow Cells with a Combined Channel/Wall-Jet Geometry

Tschupp

Temmel

Salguero

et al. 2017

J. Electrochem. Soc.

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We present numerical studies of the flow profile and electrode currents for the hydrogen oxidation and oxygen reduction reactions in an electrochemical flow cell. Koutecký-Levich type equations are obtained by partitioning the electrode surface into flow profile regimes and their correlation to idealized wall-jet and channel electrode geometries. The precision of several Koutecký-Levich type equations is evaluated and it is shown that differences between the most commonly applied equations are negligible within the range of flow rates studied and are surpassed by experimental errors.

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Investigations of hydrogen ionization on platinum with the help of micro-electrodes

Cited by 61 publications

References 14 publications

Electrocatalysts for hydrogen oxidation and evolution reactions

Electrocatalysts for hydrogen oxidation and evolution reactions

Pt/C/Ni(OH)₂Bi-Functional Electrocatalyst for Enhanced Hydrogen Evolution Reaction Activity under Alkaline Conditions

Numerical Partitioning Model for the Koutecký-Levich Analysis of Electrochemical Flow Cells with a Combined Channel/Wall-Jet Geometry

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Investigations of hydrogen ionization on platinum with the help of micro-electrodes

Cited by 61 publications

References 14 publications

Electrocatalysts for hydrogen oxidation and evolution reactions

Electrocatalysts for hydrogen oxidation and evolution reactions

Pt/C/Ni(OH)2Bi-Functional Electrocatalyst for Enhanced Hydrogen Evolution Reaction Activity under Alkaline Conditions

Numerical Partitioning Model for the Koutecký-Levich Analysis of Electrochemical Flow Cells with a Combined Channel/Wall-Jet Geometry

Contact Info

Product

Resources

About

Pt/C/Ni(OH)₂Bi-Functional Electrocatalyst for Enhanced Hydrogen Evolution Reaction Activity under Alkaline Conditions