Anodic oxidation of small organic molecules on silver modified glassy carbon electrodes

Рагойша, Г. А.; Jovanović, Vladan; Avramov-Ivić, M.; Atanasoski, Radoslav; Smyrl, William H.

doi:10.1016/0022-0728(91)87094-k

Cited by 23 publications

(12 citation statements)

References 16 publications

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“…The THPO-functionalized Au-NP colloid undergoes self-assembly when it is in contact with pure toluene leading to GCE-AuTHPO without agglomerated Au NPs. of silver ions by carbon has also been described previously [38]; however, to date, no morphological evidence has been available to support these conclusions. In our experiments, we attempted to find Au particles in the TEM images, but only a few Au NPs were available for measurement on the GCEAuCl possibly because of the limited loading of Au.…”

Section: Resultsmentioning

confidence: 52%

Electrocatalytic activity of ligand-protected gold particles: formaldehyde oxidation

Luo

Wang

2013

Gold Bull

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Tris(hydroxymethyl)phosphine oxide (THPO) and triphenyl phosphine oxide (PPh 3 O) were introduced onto the surface of colloidal gold nanoparticles (Au NPs), and the effect of capping ligands on the catalytic electrooxidation of formaldehyde was studied voltammetrically by using colloidal Au-NP-modified glassy carbon electrodes (GCEs). This was compared with polycrystalline Au and another Au-NPmodified GCE without a capping molecule. We found that PPh 3 O causes a larger decrease in the catalytic activity of the Au NPs in liquid than THPO does, indicating that the catalytic activity of the Au NPs is closely associated with the capping ligands. The effect of capping ligands is discussed based on the available surface ratio (ASR), which is defined as the ratio of the total surface area measured electrochemically to the calculated value based on the number and geometry of the Au NPs. These were determined to be 70.6 % for THPO and 0.23 % for PPh 3 O, respectively. The significant blocking of formaldehyde is probably due to the structure and hydrophobicity of the benzene rings in the PPh 3 O molecule, which is responsible for the decrease in catalytic activity of the Au NPs.

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Section: Resultsmentioning

confidence: 52%

Electrocatalytic activity of ligand-protected gold particles: formaldehyde oxidation

Luo

Wang

2013

Gold Bull

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“…To date there have been some reports on the electrocatalytic activity of well defined Ag single crystal surfaces which, however, are impractical for real applications. 17,[36][37][38][39] The applicability of silver nanospheres for a wide range of electrochemical based applications including sensing, 19,22,[40][41][42][43][44][45][46] fuel cells, 13,14,18,21,47,48 and the reduction of organic halides 49 has been reported, however, far fewer studies have systematically compared the shape dependent homogeneous catalytic 2 and electrocatalytic activity of Ag nanostructures. 15 Here, the electrocatalytic activity of Ag nanospheres, nanocubes and nanoprisms of comparable size has been investigated for important reactions such as the oxidation of small organic molecules like formaldehyde, the oxidation of hydrazine whose detection is important because it has been identified as a carcinogen and a hepatotoxin, 50,51 and the reduction of hydrogen peroxide, whose detection is also important due to its use in the textile, paper and food industries.…”

Section: Introductionmentioning

confidence: 99%

Shape dependent electrocatalytic behaviour of silver nanoparticles

et al. 2010

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The electrochemical and electrocatalytic behaviour of silver nanoprisms, nanospheres and nanocubes of comparable size in an alkaline medium have been investigated to ascertain the shape dependent behaviour of silver nanoparticles, which are an extensively studied nanomaterial. The nanomaterials were synthesised using chemical methods and characterised with UV-visible spectroscopy, transmission electron microscopy and X-ray diffraction. The nanomaterials were immobilised on a substrate glassy carbon electrode and characterised by cyclic voltammetry for their surface oxide electrochemistry. The electrocatalytic oxidation of hydrazine and formaldehyde and the reduction of hydrogen peroxide were studied by performing cyclic voltammetric and chronoamperometric experiments for both the nanomaterials and a smooth polycrystalline macrosized silver electrode. In all cases the nanomaterials showed enhanced electrocatalytic activity over the macro-silver electrode. Significantly, the silver nanoprisms that are rich in hcp lamellar defects showed greater activity than nanospheres and nanocubes for all reactions studied.

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“…Ag particles play the role of the nanoelectrodes which are “not charged by an outer potential source, but internally by chemical electron transfer reaction” . The excess free energy storage has been observed on Ag nanostructures generated on nonmetallic conductive substrates (SnO 2 , glassy carbon) under high cathodic polarization. − Ag particles formed under these conditions showed the extreme dependence of the catalytic activity on the potential and catalyzed the anodic oxidation of small organic molecules in the oscillatory mode …”

Section: Introductionmentioning

confidence: 99%

“…14 The excess free energy storage has been observed on Ag nanostructures generated on nonmetallic conductive substrates (SnO 2 , glassy carbon) under high cathodic polarization. [18][19][20] Ag particles formed under these conditions showed the extreme dependence of the catalytic activity on the potential and catalyzed the anodic oxidation of small organic molecules in the oscillatory mode. 21 In this paper the results of the investigation of the UV irradiation effect on the morphology and optical absorption of the nanosize colloidal Ag particles formed in the poly(vinyl alcohol) (PVA) matrix by Ag + reduction with formic acid are presented.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Morphology and Optical Absorption of Colloidal Silver Reduced with Formic Acid in the Polymer Matrix under UV Irradiation

et al. 1997

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The influence of the UV irradiation on the morphology and optical properties of nanosize colloidal silver particles formed in the poly(vinyl alcohol) matrix containing Ag+ and formic acid was investigated. Formation of both filament and ultrafine silver particles accompanied by a strong blue shift of the silver plasmon absorption band from 425 to 385 nm was observed under UV irradiation. The mechanism of the electron accumulation on silver particles is proposed to explain the observed morphological and spectral changes.

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Anodic oxidation of small organic molecules on silver modified glassy carbon electrodes

Cited by 23 publications

References 16 publications

Electrocatalytic activity of ligand-protected gold particles: formaldehyde oxidation

Electrocatalytic activity of ligand-protected gold particles: formaldehyde oxidation

Shape dependent electrocatalytic behaviour of silver nanoparticles

Changes in the Morphology and Optical Absorption of Colloidal Silver Reduced with Formic Acid in the Polymer Matrix under UV Irradiation

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