On the catalytic activity of silver

Goszner, K.; Körner, D.; Hite, Robert Henry

doi:10.1016/0021-9517(72)90224-2

Cited by 22 publications

(4 citation statements)

References 18 publications

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“…In principle, this process can be repeated as long as the catalytic compound is active. However, silver degrades through etching when the splitting of the H 2 O 2 takes place and therefore cannot serve as a catalytic substrate once it was exploited . A possible way to further stabilize the silver nano‐particles was previously demonstrated .…”

Section: Resultsmentioning

confidence: 99%

Mimicking Bubble Use in Nature: Propulsion of Janus Particles due to Hydrophobic‐Hydrophilic Interactions

Pinchasik

Möhwald

Skirtach

2014

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Bubbles are widely used by animals in nature in order to fulfill important functions. They are used by animals in order to walk underwater or to stabilize themselves at the water/air interface. The main aim of this work is to imitate such phenomena, which is the essence of biomimetics. Here, bubbles are used to propel and to control the location of Janus particles in an aqueous medium. The synthesis of Janus SiO2-Ag and polystyrene-Ag (PS-Ag) particles through embedment in Parafilm is presented. The Janus particles, partially covered with catalytically active Ag nanoparticles, are redispersed in water and placed on a glass substrate. The active Ag sites are used for the splitting of H2O2 into water and oxygen. As a result, an oxygen bubble is formed on one side of the particle and promotes its propulsion. Once formed, the bubble-particle complex is stable and therefore, can be manipulated by tuning hydrophilic-hydrophobic interactions with the surface. In this way a transition between two- and three- dimensional motion is possible by changing the hydrophobicity of the substrate. Similar principles are used in nature.

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Section: Resultsmentioning

confidence: 99%

Mimicking Bubble Use in Nature: Propulsion of Janus Particles due to Hydrophobic‐Hydrophilic Interactions

Pinchasik

Möhwald

Skirtach

2014

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“…02 reduction on silver electrode in 0.127M KOH solution.-It has been well documented in the literature that O2 reduction on silverelectrode occurs by either the parallel or consecutive mechanism (36). Silver is also known to be a good peroxide decomposition catalyst (37,38).…”

Section: Parameters Amentioning

confidence: 99%

Analysis of Electrokinetic Data by Parameter Estimation and Model Discrimination Technqiues

Adanuvor

White

1988

J. Electrochem. Soc.

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An alternative approach to classical methods of electrochemical data analysis is presented. This alternative method is based on nonlinear parameter estimation and model discrimination techniques. The method is used to obtain the relevant kineuc ana transport parameters and to elucidate the kinetic mechanism of 02 reduction at carbon and silver electrodes in alkaline electrolytes.Conventional methods for electrochemical data analysis generally tend to focus on a narrow range of the kinetic expressions describing the electrochemical process, such as the Tafel or the linear segments of typical polarization curves. Focus on these sections of the polarization curves produces a set of parameter values which electrochemists have traditionally used to elucidate the mechanisms of electrochemical reactions. However, in most instances, the linear and Tafel segments of these curves are distorted by diffusion processes, the reverse reaction in the neighborhood of the equilibrium potential, and coupling effects of other reactions. Therefore, parameters estimated from the Tafel or linear regions of the polarization curves, especially for complex electrode reaction systems, may not reflect the true values of the parameters of the electrode reactions under consideration. For instance, where the electrode reaction is relatively fast, the Tafel segment may be so short as to create difficulty in accurately estimating the parameters. On the other hand, for slow electrode reactions, the polarization curves can have several Tafel segments with transition regions, where the reaction from one segment could be coupled with that in another segment. McIntyre (1) noted the coupling effect of a regenerative process of a heterogeneous catalytic electrode reaction over the complete potential range in which the electroactive species was reduced and recommended that the coupling effect be taken into account if kinetic parameters characteristic of the charge-transfer reaction are to be obtained. On the other hand, the linear region extends only a few millivolts beyond the equilibrium or open-circuit potential. As pointed out by Nagy et al. (2), measurements at such low overpotentials are often hampered by signal-to-noise ratio problems, and extrapolation from the linear to higher overpotential range as commonly done in electrochemical studies is generally questionable.Most kinetic models, in addition to relating the overall process and the component steps to the potential driving force and to the concentrations of reactants, products, and * Electrochemical Society Active Member.intermediates, must also take into account the transport O f reacting species, intermediates, and products to and from the electrode surface. Furthermore, consideration of homogeneous reactions in the solution and heterogeneous non-charge transfer reactions at the electrode surface increases the complexity of the system of model equations needed to evaluate the kinetic parameters. This system of model equations is normally described by a set of differential equatio...

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“…The catalytic rate of decomposition of peroxide at the electrode surface is expressed as r~ = -khc%o2 .o [17] where the reaction order, p, can be a fraction or a whole number (11,23) and where the rate constant kh is assumed to be independent of the applied potential. The set of governing equations subject to the given boundary conditions can be solved numerically as described previously (21) to yield the values for ci and q) and thus, for C~,o and q)o from which the reaction rates at specified values of the applied potential, Eap,j (where Ea,,, = (Pmet -(Pre) can be determined.…”

Section: \ Po /mentioning

confidence: 99%

Simulation of the Polarization Curves for Oxygen Reduction at a Rotating Disk Electrode

Adanuvor

White

1987

J. Electrochem. Soc.

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On the catalytic activity of silver

Cited by 22 publications

References 18 publications

Mimicking Bubble Use in Nature: Propulsion of Janus Particles due to Hydrophobic‐Hydrophilic Interactions

Mimicking Bubble Use in Nature: Propulsion of Janus Particles due to Hydrophobic‐Hydrophilic Interactions

Analysis of Electrokinetic Data by Parameter Estimation and Model Discrimination Technqiues

Simulation of the Polarization Curves for Oxygen Reduction at a Rotating Disk Electrode

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