Electrocatalysis of Oxygen Reduction on Au Nanoparticles

Vázquez-Huerta, Gerardo; Ramos-Sánchez, Guadalupe; Antaño-López, R.; Solorza‐Feria, O.

doi:10.1149/1.3268393

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…The use of the CPE is attributed to surface non-homogeneity, roughness, reactivity porosity, and current and potential distributions associated with the electrode geometry. 38,39 The corresponding results are summarized in Table I.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Behavior of p-nitroaniline at Silver/Chitosan/Graphite Electrodes Using Electrochemical Impedance Spectroscopy

Laghrib

Aghris

Hrioua

et al. 2021

ECS J. Solid State Sci. Technol.

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This study aims to study and compare the electrochemical properties of variously silver-based carbon paste electrodes towards the catalytic reduction of hazardous nitroaromatic compound p-nitroaniline (PNA). Silver-based carbon paste electrodes have been manufactured and electrochemically characterized by using Cyclic Voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to better define the electrochemical characteristics for their use as electrocatalytic sensors. The morphology and the distribution of silver on the electrode surface were evaluated by Scanning electron microscopy (SEM). The electro-active surface area of the as prepared electrodes was estimated to be 0.095, 0.06, 0.12 and 0.10 cm2 for electrode modified with silver via electrodeposition (CPE/Ag-Edp), impregnation (CPE/Ag-Imp), graphite electrode modified with silver nanoparticles (CPE/Ag-NPs) and graphite electrode modified graphite with silver adsorbed onto Chitosan (CS) (CPE/Ag-CS), respectively, using [Fe(CN)6]3−/4− as redox probe. EIS measurements of the silver-based graphite carbon electrodes were registered in 0.1 HCl solutions. The equivalent circuit might have been used to interpret the achieved impedance spectra which included one resistor in series with parallel circuit comprised of a capacitor and resistor (1R//C). The results show that the silver nanoparticles greatly reduced the electronic transfer resistance (Rct). The electrocatalytic activity of silver based electrodes for the reduction of PNA is discussed on the basis of the real electro-active surface area and particle size which results from varying modification modes.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Behavior of p-nitroaniline at Silver/Chitosan/Graphite Electrodes Using Electrochemical Impedance Spectroscopy

Laghrib

Aghris

Hrioua

et al. 2021

ECS J. Solid State Sci. Technol.

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

Gotti

Evrard

Fajerwerg

et al. 2016

J Solid State Electrochem

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International audienceGold nanoparticles (AuNPs) were prepared by chemical route using 4 different protocols by varying reducer, stabilizing agent and solvent mixture. The obtained AuNPs were characterized by transmission electronic microscopy (TEM), UV-Visible and zeta potential measurements. From these latter surface charge densities σ were calculated to evidence the effect of the solvent mixture on AuNPs stability. The AuNPs were then deposited onto glassy carbon (GC) electrodes by drop-casting and the resulting deposits were characterized by cyclic voltammetry (CV) in H2SO4 and field emission gun scanning electron microscopy (FEG-SEM). The electrochemical kinetic parameters of the 4 different modified electrodes towards oxygen reduction reaction (ORR) in neutral NaCl-NaHCO3 media (0.15 M / 0.028 M, pH 7.4) were evaluated by rotating disk electrode voltammetry and subsequent Koutecky-Levich treatment. Contrary to what we previously obtained with electrodeposited AuNPs [Gotti et al., Electrochim. Acta 2014], the highest cathodic transfer coefficients β were not obtained on the smallest particles, highlighting the influence of the stabilizing ligand together with the deposits morphology on the ORR kinetics

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Electrodeposited gold nanoparticles on glassy carbon: Correlation between nanoparticles characteristics and oxygen reduction kinetics in neutral media

Gotti¹,

Fajerwerg²,

Evrard³

et al. 2014

Electrochimica Acta

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International audienceGold nanoparticles (AuNPs) were deposited onto glassy carbon (GC) by constant potential electrolysis (CPE) using various sets of potential and duration from -0.3 to 0.7 V and 10 to 1800 s, respectively. The physico-chemical characteristics of the as-obtained deposits were investigated by cyclic voltammetry (CV) in H2SO4, field emission gun scanning electron microscopy (FEG-SEM), and Pb underpotential deposition (UPD). Their performances towards the oxygen reduction reaction (ORR) in a NaCl-NaHCO3 (0.15 M / 0.028 M, pH 7.4) neutral solution were examined and correlated to AuNPs size and density. The best results were obtained using the deposits which exhibited a high density (555 +/- 49 µm-2) of relatively small AuNPs (25 +/- 12 nm). The Koutecky-Levich treatment was systematically applied to all the deposits in order to determine the number of electrons n exchanged for the ORR in the potential range from 0.1 to -1 V. The values of the cathodic transfer coefficients Beta n were also extracted and compared to the values reported for unmodified GC and bulk Au. A map of the Beta n values as a function of AuNPs electrodeposition potential and duration was also provided

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Electrocatalysis of Oxygen Reduction on Au Nanoparticles

Cited by 3 publications

References 6 publications

Electrochemical Behavior of p-nitroaniline at Silver/Chitosan/Graphite Electrodes Using Electrochemical Impedance Spectroscopy

Electrochemical Behavior of p-nitroaniline at Silver/Chitosan/Graphite Electrodes Using Electrochemical Impedance Spectroscopy

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

Electrodeposited gold nanoparticles on glassy carbon: Correlation between nanoparticles characteristics and oxygen reduction kinetics in neutral media

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