An in situ weighing study of the mechanism for the formation of the adsorbed oxygen monolayer at a gold electrode

Bruckenstein, Stanley; Shay, M. A.

doi:10.1016/s0022-0728(85)80057-7

Cited by 241 publications

(121 citation statements)

References 6 publications

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“…35 The electrochemistry of single crystal and polycrystalline gold electrodes in acid solution has been extensively studied in the literature using cyclic voltammetry alone [36][37][38] or in combination with other techniques such as the electrochemical quartz crystal microbalance. 9,39,40 The optical responses measured for our waveguide structure have a similar potential dependence to the changes in electroreflectance 40,41 or ellipsometric parameters 7,42,43 reported in the literature for gold electrodes in acid solution. Our waveguide SPR results are also consistent with other reported SPR studies carried out using the Kretschmann configuration to measure the resonant angle.…”

Section: Resultssupporting

confidence: 76%

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Waveguide surface plasmon resonance studies of surface reactions on gold electrodes

et al. 2002

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We describe the fabrication and characterisation of gold-coated graded index channel waveguide sensors designed for simultaneous electrochemical and surface plasmon resonance studies. The active sensing electrode area is a thin gold film between 0.5 and 5 mm in length and 200 mm wide deposited on top of a 3 mm wide waveguide which forms one arm of a Y-junction while the other arm of the Y-junction serves as a reference. Using these devices we have measured simultaneously the changes in transmittance through the device whilst carrying out cyclic voltammetry in either sulfuric or perchloric acid solution or during the deposition of an UPD layer of copper at the gold surface. In all cases we obtain stable and reproducible results which demonstrate the very high sensitivity of the devices to sub-monolayer changes occurring at the gold electrode surface. The response of these integrated optoelectrochemical devices is discussed in terms of a numerical model for the propagation of light within the waveguide structure.

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Section: Resultssupporting

confidence: 76%

“…There has been some discussion in the literature as to whether this place-exchange occurs on transfer of the first electron to form AuOH 36,37 or only with the transfer of the second electron. Based on electrochemical quartz crystal microbalance studies, Bruckenstein and Shay 39 have proposed the following mechanism Au-ðH 2 …”

Section: Resultsmentioning

confidence: 99%

Waveguide surface plasmon resonance studies of surface reactions on gold electrodes

et al. 2002

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“…It consists of anodic peaks located at 210 and 565 mV which are attributed to Co(II)/Co(III) and Co(III)/Co(IV) redox transition, associated with different cobalt oxide species on the electrode surface [30,31]. The anodic peak at around 80 mV is probably due to the adsorption of oxygen containing species, H 2 O and OH À [32]. The cathodic peaks at 185 and 540 mV correspond to the reduction of various cobalt oxide species formed during the positive sweep.…”

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confidence: 99%

A non-enzymatic amperometric sensor for glucose based on cobalt oxide nanoparticles

Sattarahmady

Heli

2012

Journal of Experimental Nanoscience

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A cobalt oxide nanoparticle-modified glassy carbon (CONM/GC) electrode was prepared by potential cycling in a pH-controlled solution containing tartrate. The electrocatalytic oxidation of glucose on CONM/GC electrode in alkaline solution was investigated and the kinetics was developed. In cyclic voltammograms, the peak current of the oxidation of low valence cobalt oxide in the presence of glucose is increased and it was followed by a decrease in the corresponding cathodic current. This suggested that glucose oxidation was being catalysed on the redox mediator with an electrocatalytic mechanism. Using cyclic voltammetry, chronoamperometry, steady-state polarisation measurements and impedance spectroscopy, the kinetic parameters of the glucose electrooxidation such as charge-transfer coefficient, the catalytic reaction rate constant and the diffusion coefficient were determined. Based on the results, an efficient enzymeless sensing procedure for determination of glucose was developed. The resulting sensor exhibited excellent performance for the glucose determination and a sensitive and time-saving amperometric procedure was successfully applied for the quantification of glucose in both batch and flow systems. Glucose was determined with a linear range of 0.7-60 mM, a limit of detection of 0.15 mM and a sensitivity of 2515.35 mA mM À1 cm À2 in batch system and with a linear range of 1.3-50 mM, a limit of detection of 0.14 mM and a sensitivity of 3240.25 mA mM À1 cm À2 in the flow system.

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“…It shows anodic peaks located at 225 and 550 mV/SCE which are attributed to Co(II)/Co(III) and Co(III)/Co(IV) redox transitions associated with different cobalt oxide species on the electrode surface. 37,38 The cathodic peaks at 186 and 522 correspond to the reduction of various cobalt oxide species formed during the positive sweep. Figure 2A represents cyclic voltammograms of the CHM-GC electrode in 100 mmol L -1 NaOH solution recorded at different potential sweep rates in a wide range of 2-150 mV s -1 .The peak-to-peak potential separation (at the potential sweep rate of 20 mV s -1 ) is 51 mV.…”

Section: Resultsmentioning

confidence: 99%

Kinetic study of electrocatalytic oxidation of carbohydrates on cobalt hydroxide modified glassy carbon electrode

Karim‐Nezhad

Hasanzadeh

Saghatforoush

et al. 2009

J. Braz. Chem. Soc.

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Este estudo investigou a oxidação eletrocatalítica de frutose, sacarose, glucose, lactose, arabinose e maltose em nanopartículas de hidróxido de cobalto eletrodepositadas na superfície de eletrodo de carbono vítreo em soluções alcalinas. Voltametria cíclica (VC), cronoamperometria (CA) e também medidas de polarização de estado estacionário foram empregados. Nos estudos de VC, na presença de carboidrato, o aumento na corrente de pico da oxidação do hidróxido de cobalto é seguido pelo decréscimo na correspondente corrente catódica. Isto indica que os carboidratos foram oxidados pelo mediador redox, o qual foi imobilizado na superfície do eletrodo, via um mecanismo eletrocatalítico. Com o uso da equação de Laviron, os valores dos coeficientes de transferência de elétron, anódicos e catódicos, e a constante da razão de transferência de carga para as espécies redox imobilizadas foram determinadas como 0,71 ± 0,03, 0,33 ± 0,03 e 0,21 ± 0,02 s This study investigated the electrocatalytic oxidation of fructose, sucrose, glucose, lactose, arabinose and maltose on nanoparticles of cobalt hydroxide electrodeposited on the surface of glassy carbon electrode in alkaline solutions. Cyclic voltammetry (CV), chronoamperometry (CA) techniques and also steady state polarization measurements have been employed. In CV studies, in the presence of carbohydrate the increase of the peak current of the oxidation of cobalt hydroxide is followed by a decrease in the corresponding cathodic current. This indicates that carbohydrates were oxidized by the redox mediator which was immobilized on the electrode surface via an electrocatalytic mechanism. With the use of Laviron's equation, the values of anodic and cathodic electron-transfer coefficients and charge transfer rate constant for the immobilized redox species were determinated as 0.71 ± 0.03, 0.33 ± 0.03 and 0.21 ± 0.02 s -1 , respectively. The rate constant, the electron transfer coefficient and the diffusion coefficients involved in the electrocatalytic oxidation of carbohydrates were determined.

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An in situ weighing study of the mechanism for the formation of the adsorbed oxygen monolayer at a gold electrode

Cited by 241 publications

References 6 publications

Waveguide surface plasmon resonance studies of surface reactions on gold electrodes

Waveguide surface plasmon resonance studies of surface reactions on gold electrodes

A non-enzymatic amperometric sensor for glucose based on cobalt oxide nanoparticles

Kinetic study of electrocatalytic oxidation of carbohydrates on cobalt hydroxide modified glassy carbon electrode

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