Enhancement of the Electrocatalytic Activity of Gold Nanoparticles Towards Methanol Oxidation

Chen, Ying; Hassel, Achim Walter; Erbe, Andreas

doi:10.1007/s12678-011-0042-5

Cited by 8 publications

(5 citation statements)

References 53 publications

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“…[42,43] Subsequently,t or emove the Pb/ PbO 2 after the electrochemical cleaning process, the supported particles were dipped in 0.1 m HNO 3 for 10 min. [45] Figure2B shows the blank voltammetric response of the Au nanoparticles after this cleaningp rocedure. As can be seen from the voltammograms, no peaks were observed between 0.25 and 0.8 V, which confirms the absence of residual Pb fromt he cleaningp rocedure.…”

Section: Characterization Of Preferentially Oriented Nanoparticlesmentioning

confidence: 99%

Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation

et al. 2015

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The surface orientation effect on the oxidation of small organic molecules such as methanol, formaldehyde, ethanol, and glycerol has been studied on Au nanoparticles in alkaline medium. Two sets of Au nanoparticles enriched in (100) and (111) facets were synthetized by using colloidal methods in presence of cetyltrimethylammonium bromide. The nanoparticles were physically characterized by using TEM and XRD and electrochemically characterized by using Pb underpotential deposition as a surface‐structure probe. It is reported that, although methanol oxidation was similar in both types of nanoparticles, the oxidation of formaldehyde presented a clear surface orientation effect. For this reaction, nanoparticles with (111) preferential orientation presented higher current densities at low potentials, whereas Au(100) nanoparticles exhibited higher activity at potentials more positive than 1.0 V versus RHE. On the other hand, for glycerol and ethanol oxidations, the onset of the reaction was similar in both types of particles, although Au(111) nanoparticles showed higher current densities than the Au(100) ones.

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Section: Characterization Of Preferentially Oriented Nanoparticlesmentioning

confidence: 99%

Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation

et al. 2015

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“…In electrocatalysis, the oxidation of organic molecules on a gold electrode material is not widely investigated like on platinum-based materials. However, some studies using smooth or supported gold-based materials were considered. − Thus, during the last two decades, the oxidation of glucose was a keen interest since one can consider glucose as a renewable fuel in energy conversion systems. ,− Therefore, the electrocatalytic oxidation of glucose in alkaline medium was studied on Cu, Ag–Au, Ag, Pt and Au materials. ,, In these latter cases and in neutral medium, gold is an attractive electrode due to its catalytic activity at low potentials compared to the other catalysts in the same conditions. ,,− …”

Section: Introductionmentioning

confidence: 99%

Insight on the Surface Structure Effect of Free Gold Nanorods on Glucose Electrooxidation

et al. 2013

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The physicochemical properties of noble metal such as gold strongly depend on their size, shape, and their surface structure composition. Gold NPs have been studied in electrocatalysis due to their unexpected activity toward the oxidation of organics. The chemical reactions studies on a well-defined shape provide fundamental data on the surface reactivity for understanding and designing novel catalytic materials. Therefore, different gold nanorods (GNRs) were synthesized by chemical growth process. The UV–vis spectroscopy and transmission electron microscopy measurements confirmed their well-defined shape and size distribution. Moreover, the under-potential of lead (UPD), which is a sensitive electrochemical surface characterization tool, has been used to assess GNRs crystallographic structure information. Additionally, the UPD of lead reveals that their crystallographic facets are affected by their growth process. Most importantly, the interaction between GNRs surface and the remaining capping agent (CTAB) adsorbed after cleaning process has a high effect on the lead deposition and also leads to a decrease in the electrochemical activity of GNRs. The activity of different GNRs toward glucose oxidation was also investigated. The correlation between the activity of these materials toward this reaction and their surface structure was established. It shows an enhancement of the electroactivity in the presence of (100) facets.

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“…By scanning towards positive potentials, lead oxides are electrodeposited on the nanoparticle surface that protects the gold surface structure while promoting the oxidation of the capping agent. 9,10 Prior to ORR experiments gold nanoparticlemodified glassy carbon electrodes were cycled in 1 mM Pb(NO 3 ) 2 , 0.1 M NaOH solution from À0.73 V (vs. SCE) to +0.5 V with three cycles performed followed by a linear scan from À0.73 V (vs. SCE) to 0 V. Following this ''cleaning'' procedure, the nanostructured electrodes were rinsed with deionised water prior to ORR experiments.…”

Section: ''Cleaning'' Of the Gold Nanoparticle Surfacementioning

confidence: 99%

“…Thus, this might be related to the removal of the citrate layer but also to the presence of lead species on the nanoparticle surface after the deposition-stripping cycling. Indeed, Chen et al 9 found traces of lead after applying a similar cleaning treatment to gold nanoparticles.…”

Section: Gold Macroelectrode and Au-nps/gcementioning

confidence: 99%

The strong catalytic effect of Pb(ii) on the oxygen reduction reaction on 5 nm gold nanoparticles

Wang

Laborda

Plowman

et al. 2014

Phys. Chem. Chem. Phys.

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Citrate-capped gold nanoparticles (AuNPs) of 5 nm in diameter are synthesized via wet chemistry and deposited on a glassy carbon electrode through electrophoresis. The kinetics of the oxygen reduction reaction (ORR) on the modified electrode is determined quantitatively in oxygen-saturated 0.5 M sulphuric acid solution by modelling the cathode as an array of interactive nanoelectrodes. Quantitative analysis of the cyclic voltammetry shows that no apparent ORR electrocatalysis takes place, the kinetics on AuNPs being effectively the same as on bulk gold. Contrasting with the above, a strong ORR catalysis is found when Pb(2+) is added to the oxygen saturated solution or when the modified electrode is cycled in lead alkaline solution such that lead dioxide is repeatedly electrodeposited and stripped off on the nanoparticles. In both cases, the underpotential deposition of lead on the gold nanoparticles is found to be related to the catalysis.

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Enhancement of the Electrocatalytic Activity of Gold Nanoparticles Towards Methanol Oxidation

Cited by 8 publications

References 53 publications

Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation

Electrochemical Oxidation of Small Organic Molecules on Au Nanoparticles with Preferential Surface Orientation

Insight on the Surface Structure Effect of Free Gold Nanorods on Glucose Electrooxidation

The strong catalytic effect of Pb(ii) on the oxygen reduction reaction on 5 nm gold nanoparticles

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