Oxygen reduction reaction features in neutral media on glassy carbon electrode functionalized by chemically prepared gold nanoparticles

Gotti, Guillaume; Evrard, David; Fajerwerg, Katia; Gros, Pierre

doi:10.1007/s10008-016-3159-x

Cited by 24 publications

(26 citation statements)

References 64 publications

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“…[14][15] Numerous investigations report on the influence of the pH on the mechanism, including when experiments are performed at neutral pH. [16][17][18] In the present work, emphasis is placed on the irreversible process associated with electron transfer. The influence of the rotation rate of the RDE from 30 to 900 rpm is shown in Figure 3a.…”

Section: Irreversible Electrochemical Reactionmentioning

confidence: 99%

On the impedance response of reactions influenced by mass transfer

2017

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Section: Irreversible Electrochemical Reactionmentioning

confidence: 99%

On the impedance response of reactions influenced by mass transfer

2017

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“…The AuNPs correspond to the bright spots meanwhile the black background is the GC disk surface, similar to what was observed by Gotti et al. .…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, Gotti et al. observed white aggregates in the SEM images, corresponding to sodium chloride crystals.…”

Section: Resultsmentioning

confidence: 99%

“…However, the electrolysis reaction does not tend to proceed uniformly, hence the deposition conditions (potential and time) and the concentration of

{A u C l}_{4}^{-}

must be controlled . Usually the size of the AuNPs electrodeposited is higher than those chemically prepared; thereby, the modification of the electrode with colloidal gold nanoparticles allows working with AuNPs with a well‐controlled shape and size, compared with electrodeposition .…”

Section: Introductionmentioning

confidence: 97%

“…The AuNP‐modified electrodes are usually fabricated by electrochemical deposition of the nanoparticles from the auric acid solution (

{H A u C l}_{4}

) , by immersion of the electrode in a colloidal gold solution (dip‐coating) or by casting a certain volume of colloidal gold solution on the surface of the electrode (drop‐coating) . The electrodeposition of nanoparticles is one of the most used methods to modify electrodes because the attachment of the AuNPs favors the direct communication with the electrode.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

et al. 2017

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Gold nanoparticles (AuNPs) have unique properties, making them attractive for electronic and energy‐conversion devices and as (electro)catalysts for electrochemical sensors. In addition to the size and shape of AuNPs, the electrocatalytic properties of AuNP‐sensors are also determined by the stabilizing agent used in their synthesis. Here, AuNPs were synthesized with citrate, alginate and quercetin, obtaining spherical and negatively charged nanoparticles. The AuNPs were used to modify glassy carbon electrodes (AuNPs/GCE), which were characterized by scanning electron microscopy and electrochemical techniques. The AuNPs/GCE showed aggregates of different sizes and degrees of dispersion on the electrode surface depending on the stabilizing agent. The AuNP's aggregates affect the homogeneity of the film, the reproducibility of the electrodes and their response in buffer solution. Finally, to evaluate the electrocatalytic ability of the AuNPs/GCE, we studied the oxidation of two analytes with opposite charges: (1) sunset yellow (negative) and (2) hydrazine (positive). Compared with GCE, the AuNPs/GCE showed good electrocatalytic properties for hydrazine, increasing the current up to 50 % and shifting the potential by almost 400 mV, depending on the AuNP used. For the negatively charged analyte, the current decreased up to 50 % and no shift in potential was observed. Thus, the electrocatalytic properties of the AuNPs showed to be highly dependent on the nature of the analyte.

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Electrochemical Cleaning Stability and Oxygen Reduction Reaction Activity of 1‐2 nm Dendrimer‐Encapsulated Au Nanoparticles

et al. 2021

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Here we show that just three electrochemical scans to modest positive potentials result in substantial growth of 1-2 nm Au dendrimer-encapsulated nanoparticles (DENs). We examined two sizes of Au DENs, denoted as G6-NH 2 (Au 147 ) and G6-NH 2 (Au 55 ), where G6-NH 2 represents a sixth-generation, amineterminated, poly(amidoamine) dendrimer and the subscripts, 147 and 55, represent the average number of atoms in each size of DENs. Ex situ transmission electron microscopy (TEM) and in situ X-ray absorption spectroscopy (XAS) results indicate that G6-NH 2 (Au 55 ) DENs grow to the same size as the G6-NH 2 (Au 147 ) DENs following these scans. Importantly, this growth occurs prior to the onset of detectable faradaic Au oxidation or reduction current. The observed growth in the size of the DENs directly correlates to changes in the electrocatalytic ORR activity. The key point is that after just three positive scans the G6-NH 2 (Au 147 ) and G6-NH 2 (Au 55 ) DENs are essentially indistinguishable in terms of both physical and electrocatalytic properties.

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Oxygen reduction reaction features in neutral media on glassy carbon electrode functionalized by chemically prepared gold nanoparticles

Cited by 24 publications

References 64 publications

On the impedance response of reactions influenced by mass transfer

On the impedance response of reactions influenced by mass transfer

Electrochemical Characterization and Electrocatalytic Application of Gold Nanoparticles Synthesized with Different Stabilizing Agents

Electrochemical Cleaning Stability and Oxygen Reduction Reaction Activity of 1‐2 nm Dendrimer‐Encapsulated Au Nanoparticles

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