Nanoparticle–electrode collision processes: Investigating the contact time required for the diffusion-controlled monolayer underpotential deposition on impacting nanoparticles

Cutress, Ian J.; Rees, Neil V.; Zhou, Yi‐Ge; Compton, Richard G.

doi:10.1016/j.cplett.2011.08.022

Cited by 15 publications

(14 citation statements)

References 27 publications

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“…The overpotential of different electrode processes (usually hydrogen evolution) taking place at such modified electrode surfaces is usually altered substantially. [19][20][21][22][23][24][25][26] In order to see the dependence of the recorded C peak on pH, experiments in which the pH was changed towards more acidic values (pH lower than 7) were designed. Unfortunately these experiments did not lead to any reliable results because the FeS NPs start to dissolve when the pH is lower than 7.…”

Section: Voltammetric Study Of the Sodium Chloride Electrolyte With Tmentioning

confidence: 99%

“…[20][21][22][23][24][25][26][27][28][29] In our study a Hg electrode with a relatively large surface (0.004 cm 2 ) was used, therefore we have to consider the possibility that a relatively high signal-to-noise ratio makes detection of the smallest FeS NPs impossible. Therefore further experiments with the use of a Au/Hg microelectrode are planned.…”

Section: Voltammetric Study Of the Sodium Chloride Electrolyte With Tmentioning

confidence: 99%

“…[18] Chronoamperometric measurements of inorganic NPs have been mostly carried out at solid electrodes. [19][20][21][22][23][24][25][26] Recently, a very extensive work on the collision of NPs at microelectrodes (Pt, Au and glassy carbon) was presented by the groups of Bard and Compton. They made a clear distinction between electrocatalytic processes occurring at the surfaces of the NPs [23][24][25][26] and oxidation events of single NPs colliding with the electrode.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22][23][24][25][26] Recently, a very extensive work on the collision of NPs at microelectrodes (Pt, Au and glassy carbon) was presented by the groups of Bard and Compton. They made a clear distinction between electrocatalytic processes occurring at the surfaces of the NPs [23][24][25][26] and oxidation events of single NPs colliding with the electrode. [22,23] Bard et al, observed the collision of single Pt NPs with a carbon electrode by electrocatalytic amplification of H þ ion reduction, where the redox process was identified to occur on the surface of the Pt NPs.…”

Section: Introductionmentioning

confidence: 99%

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The development of electrochemical methods for determining nanoparticles in the environment. Part II. Chronoamperometric study of FeS in sodium chloride solutions

et al. 2014

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Environmental context. In anoxic environments FeS is both an important mediator in the Fe and S biogeochemical cycles and plays a vital role in controlling the scavenging and availability of many trace metals. Electrochemical detection of colloidal and particulate FeS in natural waters can be done by voltammetric measurements. The recorded anodic waves, however, are rather qualitative and lack information on the FeS concentration and size distribution.Abstract. The interactions of FeS nanoparticles (NPs) with a hanging mercury drop electrode in NaCl solutions were monitored by chronoamperometric measurements. Collisions of FeS NPs with the mercury surface were studied over a wide range of electrode potentials (between 0 and À1.9 V v. Ag/AgCl). Faradaic impact transients were recorded only at the negative potentials (between À1.5 and À1.9 V). It was shown that the mercury electrode surface modified with a FeS adlayer catalyses sodium reduction by shifting the potentials of this process to more positive values. This catalytic process together with possible hydrogen evolution is assumed to be the physicochemical basis for the determination of FeS NPs. Chronoamperometric measurements at the electrode potential of À1.9 V showed that the reduction processes of sodium and hydrogen on FeS NPs upon collision are the main cause of sharp reduction current transients. At sufficiently positive electrode potentials (,À1.5 V) the colliding FeS NPs would not be immediately repelled; instead they remained adhered to the mercury surface, causing 'staircase-like' chronoamperometric signals. It appears that recorded reduction current transients are carrying FeS NPs' size information, which is consistent with parallel dynamic light scattering (DLS) measurements.

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Section: Voltammetric Study Of the Sodium Chloride Electrolyte With Tmentioning

confidence: 99%

Section: Voltammetric Study Of the Sodium Chloride Electrolyte With Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The development of electrochemical methods for determining nanoparticles in the environment. Part II. Chronoamperometric study of FeS in sodium chloride solutions

et al. 2014

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“…The idea of BBrownian activation^has been postulated previously for example for the inter-nanoparticle electron transfer within hybrid films of redox active TiO 2 nanoparticles [29]. Related effects of Brownian motion at liquid/solid interfaces may also play a role in the voltammetry of Bimpact^processes [30,31] where stochastic effects are assigned to bulk transport (motion) rather than to surface processes (activation).…”

Section: Resultsmentioning

confidence: 99%

Redox reactivity at silver microparticle—glassy carbon contacts under a coating of polymer of intrinsic microporosity (PIM)

Rauwel

Malpass‐Evans

et al. 2017

J Solid State Electrochem

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Silver microparticles (ca. 1 μm average size clustered into cage-like aggregates of 10-20 μm diameter) are shown to adhere to a glassy carbon electrode surface to give voltammetric current responses, which are considerably enhanced/stabilised when applying a coating with a molecularly rigid polymer of intrinsic microporosity (PIM-EA-TB). In preliminary voltammetric experiments characteristic Ag(0/I) surface oxidation and back-reduction processes are observed in aqueous phosphate buffer (associated with silver phosphate layer formation on the silver surface). In contrast to the oxidation, which is dominated by a nucleation process causing a sharp well-defined current signal, for the back-reduction stochastic current responses are observed possibly associated with density fluctuations in the surrounding liquid phase (BBrownian activation^) as an essential part of the mechanism of conversion of surface-oxidised silver back to silver metal.

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Electrochemical Detection of Positively Charged Carbon Nanoparticles Suspension in Flow

et al. 2018

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The electrochemical behaviour of suspended nanoparticles received some attention recently. Very few studies are performed in the flow system. Here, we have demonstrated that injection of positively charged (with ammonium functionalities) carbon nanoparticles suspension to flowing ascorbic acid solution significantly enhances its chronoamperometric response and can be used for these nanoparticles detection. This is because of electrocatalytic properties of these nanoparticles towards ascorbic acid electrooxidation. The magnitude of the signal depends on the type of flow system and is larger than in the case of suspension of negatively charged nanoparticles. It is also proportional to the concentration of nanoparticles. Their adsorption on the electrode surface plays the crucial role in the electrode process.

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Nanoparticle–electrode collision processes: Investigating the contact time required for the diffusion-controlled monolayer underpotential deposition on impacting nanoparticles

Cited by 15 publications

References 27 publications

The development of electrochemical methods for determining nanoparticles in the environment. Part II. Chronoamperometric study of FeS in sodium chloride solutions

The development of electrochemical methods for determining nanoparticles in the environment. Part II. Chronoamperometric study of FeS in sodium chloride solutions

Redox reactivity at silver microparticle—glassy carbon contacts under a coating of polymer of intrinsic microporosity (PIM)

Electrochemical Detection of Positively Charged Carbon Nanoparticles Suspension in Flow

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