Effect of molecular mobility on kinetics of an electrochemical Langmuir-Hinshelwood reaction

Петухов, А.В.

doi:10.1016/s0009-2614(97)00916-0

Cited by 67 publications

(45 citation statements)

References 22 publications

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“…Under these conditions, the high CO diffusion rate causes an enhancement of the growth rate of the OH islands due to the improved mixing. 31 Note that, in contrast to the transient in Fig. 5͑c͒, the transient in Fig.…”

Section: Cyclic Voltammetry Of Slowmentioning

confidence: 84%

“…5͑c͒ were not found by other authors who carried out a potential step analysis of a Langmuir-Hinshelwood mechanism very similar to ours. 30,31 The origin of the shape of the transients and the difference between the two transients for slow and fast surface diffusion can be understood, at least qualitatively, by discussing the classical theory for the nucleation and growth of two-dimensional films. 28,32 Let M 0 be the number of holes in the initial CO layer.…”

Section: B Potential Step Chronoamperometry Of Fastmentioning

confidence: 99%

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Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

Koper

Jansen

Santen

et al. 1998

The Journal of Chemical Physics

195

253

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A simple lattice-gas model for the electrocatalytic carbon monoxide oxidation on a platinum electrode is studied by dynamic Monte Carlo simulations. The CO oxidation takes place through a Langmuir-Hinshelwood reaction between adsorbed CO and an adsorbed OH radical resulting from the dissociative adsorption of water. The model enables the investigation of the role of CO surface mobility on the macroscopic electrochemical response such as linear sweep voltammetry and potential step chronoamperometry. Our results show that the mean-field approximation, the traditional but often tacitly made assumption in electrochemistry, breaks down severely in the limit of vanishing CO surface mobility. Comparison of the simulated and experimental voltammetry suggests that on platinum CO oxidation is the intrinsically fastest reaction on the surface and that CO has a high surface mobility. However, under the same conditions, the model predicts some interesting deviations from the potential step current transients derived from the classical nucleation and growth theories. Such deviations have not been reported experimentally. Furthermore, it is shown that our simple model predicts different Tafel slopes at low and high potential, the qualitative features of which are not strongly influenced by the CO mobility. The comparison of our simulation results to the experimental literature is discussed in some detail.

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Section: Cyclic Voltammetry Of Slowmentioning

confidence: 84%

Section: B Potential Step Chronoamperometry Of Fastmentioning

confidence: 99%

Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

Koper

Jansen

Santen

et al. 1998

The Journal of Chemical Physics

195

253

View full text Add to dashboard Cite

show abstract

“…To depict the kinetics of photocatalytic reactions of aqueous organics, the Langmuir-Hinshelwood (L-H) model was employed [23][24][25]. According to this model, the relationship between the degradation rate ( ) and concentration of the reactant in water at time ( ) can be expressed as follows:…”

Section: Kinetic Studiesmentioning

confidence: 99%

Laboratory and Pilot-Plant Scale Photocatalytic Degradation of Polychlorinated Biphenyls in Seawater Using CM-n-TiO₂Nanoparticles

Shaban

Sayed

Maradny

et al. 2016

International Journal of Photoenergy

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Photocatalytic degradation of polychlorinated biphenyls (PCBs) in seawater was successfully achieved at laboratory level with UV light and at pilot-plant scale under natural solar radiation using carbon-modified titanium oxide (CM-n-TiO 2 ) nanoparticles. The photocatalytic performance of CM-n-TiO 2 was comparatively evaluated with reference n-TiO 2 under identical conditions. As a result of carbon incorporation, significant enhancement of photodegradation efficiency using CM-n-TiO 2 was clearly observed. To optimize the operating parameters, the effects of catalyst loading and pH of the solution on the photodegradation rate of PCBs were investigated. The best degradation rate was obtained at pH 5 and CM-n-TiO 2 loading of 0.5 g L −1 . The photodegradation results fitted the Langmuir-Hinshelwood model and obeyed pseudo-first-order reaction kinetics.

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“…where k r is the rate constant and K ad is the adsorption equilibrium constant [38][39][40][41]. When the adsorption is relatively weak and/or the reactant concentration is low, equation (10) can be simplified to the pseudo-first order kinetics with an apparent first-order rate constant k app :…”

Section: Kinetics Of Photodegradationmentioning

confidence: 99%

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO<sub>2</sub> Photocatalyst

Shaban¹

2013

MRC

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The simultaneous photocatalytic production of hydrogen and degradation of naphthalene in seawater was successfully achieved using carbon modified titanium oxide (CM-n-TiO 2 ) nanoparticles under natural sunlight illumination. Compared to unmodified titanium oxide (n-TiO 2 ), CM-n-TiO 2 nanoparticles exhibited significantly higher photocatalytic efficiency. It is considered that carbon modification is responsible for the significant enhancement in the observed photoactivity. The experimental results indicated that the simultaneous production of hydrogen and degradation of naphthalene was favorable at pH 8 and optimal catalyst dose of 1.0 g·L . The solar photocatalytic degradation of naphthalene in seawater using CM-n-TiO 2 successfully fitted using Langmuir-Hinshelwood model, and can be described by pseudo-first order kinetic model.

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Effect of molecular mobility on kinetics of an electrochemical Langmuir-Hinshelwood reaction

Cited by 67 publications

References 22 publications

Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

Laboratory and Pilot-Plant Scale Photocatalytic Degradation of Polychlorinated Biphenyls in Seawater Using CM-n-TiO₂Nanoparticles

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO<sub>2</sub> Photocatalyst

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Effect of molecular mobility on kinetics of an electrochemical Langmuir-Hinshelwood reaction

Cited by 67 publications

References 22 publications

Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

Monte Carlo simulations of a simple model for the electrocatalytic CO oxidation on platinum

Laboratory and Pilot-Plant Scale Photocatalytic Degradation of Polychlorinated Biphenyls in Seawater Using CM-n-TiO2Nanoparticles

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO&lt;sub&gt;2&lt;/sub&gt; Photocatalyst

Contact Info

Product

Resources

About

Laboratory and Pilot-Plant Scale Photocatalytic Degradation of Polychlorinated Biphenyls in Seawater Using CM-n-TiO₂Nanoparticles

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO<sub>2</sub> Photocatalyst