Cyclic voltammetry at gold single-crystal surfaces. Part 1. Behaviour at low-index faces

Hamelin, A.

doi:10.1016/0022-0728(95)04499-x

Cited by 513 publications

(294 citation statements)

References 49 publications

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“…Surface-structure-sensitive reactions, which have been extensively studied, [18][19][20][21][22][23][24][25][26][27][28] are the method of choice for this purpose. Within the scope of electrochemistry, the well-known underpotential deposition (UPD), by electrodepositing metal monolayer(s) on a foreign metal substrate at potentials that can be significantly less negative than that for deposition on the same metal surface as the adsorbate, which are usually performed on single-crystal electrodes, could allow the detection of the surface structure of the sample.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, only a limited number of particles can be analyzed, which may not be representative of the overall surface crystalline structure of the sample. Since most of the electrocatalytic reactions are very sensitive to surface structure, [17][18][19][20] it is necessary to find a potent and convenient way to "see" the surface structures of the nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Reactivity of Gold Nanobelts with Unique {110} Facets

2010

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Gold nanobelts were synthesized by directional solidification of the Fe-Au eutectoid followed by selective phase dissolution. Cleaning from organic molecules was performed in alkaline solution by PbO(2) deposition/dissolution to avoid surface reconstruction. The electrochemical behaviour of the Au nanobelts was determined by structure-sensitive electrochemical reactions, and the findings confirm the results obtained by selected area electron diffraction (SAED). The underpotential deposition (UPD) of lead under alkaline conditions and cyclic voltammograms (CVs) in sulphuric acid revealed an unusual large amount of (110) domains (>65%). Finally, after cleaning the Au nanobelts showed a higher and stable electrocatalytic behaviour toward methanol oxidation in alkaline media. The possible mechanism and the potential applications of the Au nanobelts are discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactivity of Gold Nanobelts with Unique {110} Facets

2010

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“…This behavior of the gold electrode in the double layer region as well as the surface oxidation region is structure dependent as evidenced by Kokoh et al [3,4] on size and shape controlled gold nanoparticles and Hamelin [52] on gold single-crystal Au (1 1 1) and Au (1 0 0). At higher potentials than 1.2 V vs. RHE, different oxidation peaks depending on the particles shape can be noticed: one oxidation peak is observed for spherical gold nanoparticles at 1.25 V vs. RHE ( Figure 5A); two peaks are revealed on the surface of AuNRs and polyhedral particles at 1.25 V and 1.35 V vs. RHE, respectively (Figure 5B), and one main oxidation peak is observed at 1.25 V followed by shoulder peaks between 1.35 V and 1.50 V vs. RHE for bulk gold electrode.…”

Section: Cyclic Voltammetry In Alkaline Solutionmentioning

confidence: 96%

Electrochemical Reactivity at Free and Supported Gold Nanocatalysts Surface

Hebié¹,

Holade²,

Servat³

et al. 2016

Catalytic Application of Nano-Gold Catalysts

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This chapter presents an overview on size, structure, morphology, composition as well as the effect of the support on the electrocatalytic properties of gold nanoparticles (AuNPs). It was found that the electrocatalytic properties of unsupported AuNPs strongly depend on their size and shape. Consequently, the electrocatalytic properties of AuNPs can be tuned. Furthermore, to design high-performance electrocatalysts with minimal precious metal content and cost, the direct immobilization of metal NPs onto carbon-based substrates during their synthesis constitutes another elegant alternative and has been thoroughly examined. These "easy-to-use" supports as scaffolds for AuNPs, namely carbon black, carbon paper, etc., offer beneficial contributions. Indeed, thanks to their high available surface area, good electronic conductivity and synergistic effect between the chemical species present on their surface and the loaded NPs, carbon-based supports enable maximizing the efficient utilization of the catalysts toward drastic enhancement in both activity and durability. We also examined different judicious combinations of (electro)analytical techniques for the unambiguous determination of the reaction product(s) over the Au-based nanocatalysts, using glucose as model molecule given its importance in electrocatalysis. The performances of carbonsupported AuNPs as anode materials in direct glucose fuel cell in alkaline medium were also discussed.

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“…The most popular hypothesis is the formation of hydrated oxides or the formation of Au(OH)n ads [13]. The CV voltammogram obtained with the AuNPs-GCS presents the typical peaks of gold electrodes and a "shoulder" (Fig.…”

Section: Gold Nanostructured Active Surfacementioning

confidence: 99%

New Easy Method for the Monitoring of Hg Concentration in Fish, Using a Nanostructured Gold Electrode

Giacomino¹,

Schirinzi²,

Pandi³

et al. 2015

JESE-A

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Abstract:The applicability of a gold nanoparticle-modified glassy carbon sensor (AuNPs-GCS) for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry (SW-ASV) is demonstrated. Mercury content in sample Tuna Fish ISPRA T22 was determined to value the accuracy of the determination. The concentration in this sample is not certified, so, the Hg amount was determined also with atomic absorption spectroscopy (AAS): the results obtained with ASV were in good agreement and confirmed literature value reported for this sample. Then, real samples of tuna fish were analyzed. The voltammetric analyses were performed using previously optimized conditions (deposition potential 0 V, step potential 0.004 V, frequency 150 Hz and amplitude 0.003 V). Medium exchange technique permitted to eliminate possible matrix effects. The concentrations in the real samples were found to be in agreement with the common Hg levels reported in literature for commercialized tuna fish in different countries.

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Cyclic voltammetry at gold single-crystal surfaces. Part 1. Behaviour at low-index faces

Cited by 513 publications

References 49 publications

Reactivity of Gold Nanobelts with Unique {110} Facets

Reactivity of Gold Nanobelts with Unique {110} Facets

Electrochemical Reactivity at Free and Supported Gold Nanocatalysts Surface

New Easy Method for the Monitoring of Hg Concentration in Fish, Using a Nanostructured Gold Electrode

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