Electroreduction of oxygen on gold nanoparticle/PDDA-MWCNT nanocomposites in acid solution

Alexeyeva, Nadezda; Tammeveski, Kaido

doi:10.1016/j.aca.2008.04.056

Cited by 64 publications

(45 citation statements)

References 47 publications

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“…Such behaviour is typical for O 2 reduction on nanostructured Au electrodes in acidic media. [29,30,44,46,52] A comparison of different Au catalysts is presented in Figure 7. It is important to note that for the nanoparticle-modified electrodes with a fixed mass of nanocatalyst per unit area, the electrocatalytic activity is determined by the size and shape of the catalyst particles.…”

Section: Cyclic Voltammetry Of Au/c Catalystsmentioning

confidence: 99%

“…[57] Alexeyeva et al prepared AuNP/carbon-nanotube composite materials using different approaches and these catalysts showed high electrocatalytic ORR activity in acidic media. [42,[44][45][46] Previously, we have also studied the effect of Au/ C layer thickness on the electrocatalytic activity for ORRs in acidic and alkaline solutions and found that the SA of Au is independent of catalyst loading. [47] AuNPs in conjunction with organic compounds have also shown high activity for O 2 reduction.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, AuNPs supported on high-area carbon materials such as carbon nanotubes or carbon black and, more recently, on graphene, have been used as electrocatalysts for O 2 reduction. [41][42][43][44][45][46][47][48][49][50][51][52][53][54] Tang et al investigated how Au particle size affects the ORR activity in a basic electrolyte. [41] They found that 3 nm Au clusters on a carbon support exhibited higher ORR activity, and also a four-electron reduction of O 2 occurred on these particles, whereas on 7 nm AuNPs the two-electron reduction to HO 2 À predominates.…”

Section: Introductionmentioning

confidence: 99%

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Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

et al. 2014

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Cubic, octahedral and quasi‐spherical (two different particle sizes) Au nanoparticles are synthesised and dispersed in a carbon‐black powder. The size and morphology of the Au nanocatalysts is confirmed by transmission electron microscopy and X‐ray diffraction. Au nanospheres are approximately 5 and 30 nm in diameter, whereas the size of Au octahedra and nanocubes is approximately 40–45 nm. The electrocatalytic activity of these carbon‐supported particles towards the oxygen reduction reaction (ORR) is studied in 0.5 M H2SO4 and 0.1 M KOH solutions by using the rotating‐disk‐electrode method. The specific activity (SA) for O2 reduction is measured, and the highest SA is observed for Au nanocubes supported on carbon. The highest mass activities are found for the smallest Au nanoparticles. Tafel analysis suggests that the mechanism of the ORR on shape‐controlled Au/C catalysts is the same as on bulk Au.

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Section: Cyclic Voltammetry Of Au/c Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

et al. 2014

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“…13,25,36,37 Evaluation of AuNP surface coverage.-Voltammograms of AuNP/PDDA-modified SPCEs in 0.5 M H 2 SO 4 exhibited characteristic peaks at +1.25 (±0.010) V and +0.66 (±0.025) V corresponding to the oxidation and subsequent reduction of AuNPs, respectively (Figure 4). 38,39 Surface areas attributed to AuNPs for AuNP/PDDAmodified SPCEs were estimated using the charge associated with the reduction peak at +0.66 (±0.025) V. [38][39][40] For a monolayer of gold, the integration of this reduction peak results in a charge of 400 μC cm −2 .…”

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confidence: 99%

Use of Redox Probes for Characterization of Layer-by-Layer Gold Nanoparticle-Modified Screen-Printed Carbon Electrodes

Bishop

Ahiadu

Smith

et al. 2016

J. Electrochem. Soc.

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The electrochemical characteristics of bare and surface-modified screen-printed carbon electrodes (SPCEs) were compared using voltammetric responses of common redox probes to determine the potential role of nanomaterials in previously documented signal enhancement. SPCEs modified with gold nanoparticles (AuNPs) by layer-by-layer (LbL) electrostatic adsorption were previously reported to exhibit an increase in voltammetric signal for Fe(CN) 6 3−/4− that corresponds to an improvement of 102% in electroactive surface area over bare SPCEs. AuNP-modified SPCEs prepared by the same LbL strategy using the polycation poly(diallyldimethylammonium chloride) (PDDA) here were found to provide no beneficial increase in electroactive surface area over bare SPCEs. Though similar improvement in voltammetric signal of Fe(CN) 6 3−/4− was found for AuNP/PDDA-modified compared to bare SPCEs in these studies, results with other redox couples ferrocene methanol (FcMeOH/FcMeOH + ) and Ru(NH 3 ) 6 3+/2+ indicated no difference between the electroactive surface areas of modified and bare SPCEs. Furthermore, gold present on AuNP/PDDAmodified SPCEs accounted for only 62 (±12)% of the electroactive surface area. The previously reported improvement in electroactive surface area that was attributed to the inclusion of AuNPs on the SPCE surface appears to have resulted from a misinterpretation of the non-ideal behavior of Fe(CN) 63− as a redox probe for bare SPCEs.

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“…A number of materials are now used, stemming from polyelectrolytes 6 to metal complexes, 7 metal nanoparticles, 8 metal-oxide clusters 9-11 and biomolecules, 12 for an equally wide variety of applications, including sensors, 13 biosensors 14,15 and electro-and photochromic devices. 16 Of particular relevance for the present work are the polyoxometalate clusters (POMs), which are nanosized metal-oxide clusters also used in LbL lms.…”

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confidence: 99%

Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines

et al. 2014

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2014Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines RSC Advances,Cambridge : Royal Society of Chemistry -RSC,v. 4, n. 56, p. 29612-29621, 2014 http://www.producao.usp.br/handle/BDPI/50444 One of the major advantages of the Layer-by-Layer (LbL) deposition technique is the possible control of molecular architecture, not only to achieve optimized properties but also to seek synergy among different materials. In this study, LbL films containing nanoclusters of a Keggin type polyoxometalate, phosphotungstic acid (HPW), alternated with the polycation poly(allylamine hydrochloride) (PAH) were deposited on indium-tin oxide (ITO) substrates. The electrochemical properties of the hybrid LbL film investigated in acidic conditions indicated no significant desorption of HPW, when a layer of poly(dimethylsiloxane) terminated with 3-aminopropyl groups (PDMS) was previously deposited on the ITO substrate. Such effect occurred because PDMS prevents desorption of HPW from the hybrid film, asshown by X-ray Photoelectron Spectroscopy (XPS) analyses. The porous structures of the films were revealed by Fourier transform infrared reflection absorption spectroscopy, scanning electron microscopy and XPS. PDMS/PAH as a pre-coating allowed the HPW/PAH films to be sensitive to the electrochemical detection of the triazines atrazine and melamine. In conclusion, the precise control of the LbL films architecture is important to develop opportunities for new applications.

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Electroreduction of oxygen on gold nanoparticle/PDDA-MWCNT nanocomposites in acid solution

Cited by 64 publications

References 47 publications

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

Use of Redox Probes for Characterization of Layer-by-Layer Gold Nanoparticle-Modified Screen-Printed Carbon Electrodes

Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines

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