The Experts below are selected from a list of 234 Experts worldwide ranked by ideXlab platform
Marcin Opallo - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical behaviour of suspended redox-tagged carbon nanotubes at a Rotating Disc Electrode
Electrochemistry Communications, 2019Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Abstract Although the electrochemical behaviour of an aqueous dispersion of nanometer-sized redox active nanoparticles has recently received some attention, there are very few such studies of larger objects. Here, we present a study of the electrochemical behaviour of an aqueous dispersion of redox (2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonate)-tagged multiwalled carbon nanotubes at a Rotating Disc Electrode. The electrochemical signal related to adsorbed redox-tagged nanotubes was recorded by cyclic voltammetry, while the signal related to collisions of their agglomerates or aggregates was detected using chronoamperometric methods.
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Electrochemical behaviour of suspended redox-tagged carbon nanotubes at a Rotating Disc Electrode
Elsevier, 2019Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Although the electrochemical behaviour of an aqueous dispersion of nanometer-sized redox active nanoparticles has recently received some attention, there are very few such studies of larger objects. Here, we present a study of the electrochemical behaviour of an aqueous dispersion of redox (2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonate)-tagged multiwalled carbon nanotubes at a Rotating Disc Electrode. The electrochemical signal related to adsorbed redox-tagged nanotubes was recorded by cyclic voltammetry, while the signal related to collisions of their agglomerates or aggregates was detected using chronoamperometric methods. Keywords: Multiwalled carbon nanotubes, Rotating Disc Electrode, Collisions, ABTS, Voltammetry, Chronoamperometr
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Collisions of suspended Prussian Blue nanoparticles with a Rotating Disc Electrode
Elsevier, 2018Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a Rotating Disc Electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H2O2 as a result of catalytic amplification. Keywords: Prussian Blue, Rotating Disc Electrode, Suspension, Nanoparticles, Chronoamperometry, Hydrogen peroxid
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Collisions of suspended Prussian Blue nanoparticles with a Rotating Disc Electrode
Electrochemistry Communications, 2017Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Abstract The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a Rotating Disc Electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H 2 O 2 as a result of catalytic amplification.
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The effect of electrocatalytic nanoparticle injection on the electrochemical response at a Rotating Disc Electrode
Electrochemistry Communications, 2013Co-Authors: Joanna Dolinska, Martin Jönsson-niedziolka, Volodymyr Sashuk, Marcin OpalloAbstract:Abstract A new approach to study electrocatalytic oxidation of glucose is proposed. As opposed to numerous studies on Electrodes modified with gold nanoparticles this reaction was studied in their suspension of gold nanoparticles under hydrodynamic conditions on a noncatalytic glassy carbon Rotating Disc Electrode. It has been shown that addition of nanogram amount of positively charged Au nanoparticles results in a clear current response, whereas no clear response is seen for negatively charged ones. This effect results from the electrocatalytic oxidation of glucose on Au nanoparticles mainly adsorbed on glassy carbon Electrode. The role of Electrode preparation method on reproducibility of the results is emphasized.
Marcin Holdynski - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical behaviour of suspended redox-tagged carbon nanotubes at a Rotating Disc Electrode
Electrochemistry Communications, 2019Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Abstract Although the electrochemical behaviour of an aqueous dispersion of nanometer-sized redox active nanoparticles has recently received some attention, there are very few such studies of larger objects. Here, we present a study of the electrochemical behaviour of an aqueous dispersion of redox (2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonate)-tagged multiwalled carbon nanotubes at a Rotating Disc Electrode. The electrochemical signal related to adsorbed redox-tagged nanotubes was recorded by cyclic voltammetry, while the signal related to collisions of their agglomerates or aggregates was detected using chronoamperometric methods.
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Electrochemical behaviour of suspended redox-tagged carbon nanotubes at a Rotating Disc Electrode
Elsevier, 2019Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Although the electrochemical behaviour of an aqueous dispersion of nanometer-sized redox active nanoparticles has recently received some attention, there are very few such studies of larger objects. Here, we present a study of the electrochemical behaviour of an aqueous dispersion of redox (2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonate)-tagged multiwalled carbon nanotubes at a Rotating Disc Electrode. The electrochemical signal related to adsorbed redox-tagged nanotubes was recorded by cyclic voltammetry, while the signal related to collisions of their agglomerates or aggregates was detected using chronoamperometric methods. Keywords: Multiwalled carbon nanotubes, Rotating Disc Electrode, Collisions, ABTS, Voltammetry, Chronoamperometr
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Collisions of suspended Prussian Blue nanoparticles with a Rotating Disc Electrode
Elsevier, 2018Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a Rotating Disc Electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H2O2 as a result of catalytic amplification. Keywords: Prussian Blue, Rotating Disc Electrode, Suspension, Nanoparticles, Chronoamperometry, Hydrogen peroxid
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Collisions of suspended Prussian Blue nanoparticles with a Rotating Disc Electrode
Electrochemistry Communications, 2017Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Abstract The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a Rotating Disc Electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H 2 O 2 as a result of catalytic amplification.
R I Tucceri - One of the best experts on this subject based on the ideXlab platform.
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the charge transport process at gold Electrodes modified by thick nickel hydroxide films a study employing Rotating Disc Electrode voltammetry in the presence of the fe cn 63 4 redox couple
Journal of Electroanalytical Chemistry, 2016Co-Authors: R I TucceriAbstract:Abstract Rotating Disc Electrode voltammetry (RDEV) was employed to study the transport properties of nickel hydroxide films electrochemically deposited on gold in the presence of the Fe(CN)63 −/4 − redox couple. Gold Electrodes coated with nickel hydroxide surface coverages within the range 0.7 nmol cm− 2 7000 rpm).
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effect of prolonged Electrode potential cycling on the charge transport parameters of poly o aminophenol films a study employing Rotating Disc Electrode voltammetry and surface resistance
Journal of Electroanalytical Chemistry, 2014Co-Authors: R I TucceriAbstract:Abstract The aim of this work was to study the effect of prolonged potentiodynamic cycling (PPC) on the conducting properties of poly(o-aminophenol) (POAP) film Electrodes. Cyclic Voltammetry (CV), Rotating Disc Electrode Voltammetry (RDEV) and Surface Resistance (SR) were employed in this study. The attenuation of the voltammetric response of the polymer with the increase in the number of oxidation–reduction cycles allowed one to define a degree of deactivation. RDEV was employed to obtain the dependence of the electron diffusion coefficient on the degree of deactivation of the polymer. The slower electron transport with the increase in the degree of deactivation was attributed to the increase of the electron hopping distance between redox sites. The attenuation of the relative resistance changes (ΔR/R) of a gold film coated with a POAP film as the degree of deactivation increases was also associated to changes in the redox site configuration at the gold/POAP interface after PPC. POAP films maintain their conducting properties almost unaltered for about 500 potential cycles at a scan rate of 0.010 V s−1. However, a loss of conductivity was observed as the number of potential cycles was extended beyond 500.
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Transport across poly(o-aminophenol) modified Electrodes in contact with media containing redox active couples. A study using Rotating Disc Electrode voltammetry
Journal of Electroanalytical Chemistry, 1999Co-Authors: A Bonfranceschi, A Pérez Córdoba, S Keunchkarian, S Zapata, R I TucceriAbstract:Abstract The electrochemistry of poly( o -aminophenol) modified Electrodes in the presence of different electroactive solutes (Fe(CN) 6 4−/3− , hydroquinone/benzoquinone (HQ/Q), Sn 2+ ) able to diffuse through the polymer film was studied by Rotating Disc Electrode voltammetry. Experimental results relating to the diffusion of these electroactive species through the polymer were interpreted on the basis of the membrane–diffusion theory for the Rotating Disc Electrode. The electron hopping model was invoked in order to obtain a diffusion constant for the electron transport. External variables such as thickness and acid concentration in solution affect both the permeation process of electroactive species and the electron motion within the film. The effect of film thickness on the permeability of the electroactive species was attributed to changes in the polymer morphology as the film thickness varies. The influence of the acid concentration in solution on the electron transport was ascribed to a different degree of protonation of the polymer redox centers, which affects the electron hopping process. Permeation of electroactive species across the polymer decreases as the acid concentration in solution decreases. This was attributed to a progressive polymer oxidation as the pH increased which would affect the swelling of the polymer. For high film thickness and a given acid concentration in solution (pH 1), the following sequence of permeation rates for the different electroactive species through the polymer is obtained κD s (Sn 2+ ) κD s (Fe(CN) 6 4−/3− ) κD s (HQ/Q). These permeabilities are compared with the diffusion rate of electroinactive anions required to maintain electroneutrality of the polymer. Low permeability for highly charged species could be due to ion-pairing effects and formation of a coordination complex inside the film. Formation of hydrogen bonds inside the film could affect the diffusion rate of neutral species. Also, different partitioning ( κ ) of charged and undercharged redox species at the polymer ∣ solution interface during the oxidation process of the polymer could influence the permeation process of these electroactive species.
Joanna Dolinska - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical behaviour of suspended redox-tagged carbon nanotubes at a Rotating Disc Electrode
Electrochemistry Communications, 2019Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Abstract Although the electrochemical behaviour of an aqueous dispersion of nanometer-sized redox active nanoparticles has recently received some attention, there are very few such studies of larger objects. Here, we present a study of the electrochemical behaviour of an aqueous dispersion of redox (2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonate)-tagged multiwalled carbon nanotubes at a Rotating Disc Electrode. The electrochemical signal related to adsorbed redox-tagged nanotubes was recorded by cyclic voltammetry, while the signal related to collisions of their agglomerates or aggregates was detected using chronoamperometric methods.
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Electrochemical behaviour of suspended redox-tagged carbon nanotubes at a Rotating Disc Electrode
Elsevier, 2019Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Although the electrochemical behaviour of an aqueous dispersion of nanometer-sized redox active nanoparticles has recently received some attention, there are very few such studies of larger objects. Here, we present a study of the electrochemical behaviour of an aqueous dispersion of redox (2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonate)-tagged multiwalled carbon nanotubes at a Rotating Disc Electrode. The electrochemical signal related to adsorbed redox-tagged nanotubes was recorded by cyclic voltammetry, while the signal related to collisions of their agglomerates or aggregates was detected using chronoamperometric methods. Keywords: Multiwalled carbon nanotubes, Rotating Disc Electrode, Collisions, ABTS, Voltammetry, Chronoamperometr
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Collisions of suspended Prussian Blue nanoparticles with a Rotating Disc Electrode
Elsevier, 2018Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a Rotating Disc Electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H2O2 as a result of catalytic amplification. Keywords: Prussian Blue, Rotating Disc Electrode, Suspension, Nanoparticles, Chronoamperometry, Hydrogen peroxid
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Collisions of suspended Prussian Blue nanoparticles with a Rotating Disc Electrode
Electrochemistry Communications, 2017Co-Authors: Marcin Holdynski, Joanna Dolinska, Marcin OpalloAbstract:Abstract The electrochemistry of suspended nanoparticles has attracted some attention as a method of characterizing them. Taking redox-active Prussian Blue nanoparticles as an example, we demonstrate that suspended redox-active inorganic nanoparticles exhibit electrochemical reactivity. When the potential of a Rotating Disc Electrode is sufficiently low or high, a series of injections of a suspension of nanoparticles into an aqueous electrolyte produces sharp current increases resulting from their electroreduction or electrooxidation, respectively. The magnitude of the current steps is linearly dependent on the concentration of the nanoparticles. Much larger current steps are obtained in the presence of H 2 O 2 as a result of catalytic amplification.
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The effect of electrocatalytic nanoparticle injection on the electrochemical response at a Rotating Disc Electrode
Electrochemistry Communications, 2013Co-Authors: Joanna Dolinska, Martin Jönsson-niedziolka, Volodymyr Sashuk, Marcin OpalloAbstract:Abstract A new approach to study electrocatalytic oxidation of glucose is proposed. As opposed to numerous studies on Electrodes modified with gold nanoparticles this reaction was studied in their suspension of gold nanoparticles under hydrodynamic conditions on a noncatalytic glassy carbon Rotating Disc Electrode. It has been shown that addition of nanogram amount of positively charged Au nanoparticles results in a clear current response, whereas no clear response is seen for negatively charged ones. This effect results from the electrocatalytic oxidation of glucose on Au nanoparticles mainly adsorbed on glassy carbon Electrode. The role of Electrode preparation method on reproducibility of the results is emphasized.
Luke J Venstrom - One of the best experts on this subject based on the ideXlab platform.
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solar thermal decoupled water electrolysis process iii the anodic electrochemical reaction in a Rotating Disc Electrode cell
Chemical Engineering Science, 2020Co-Authors: Rachel Silcox, Laura K Engerer, Shahin S Nudehi, Paul Smith, J Schoer, Peter T Krenzke, Robert Palumbo, Luke J VenstromAbstract:Abstract The electrochemical oxidation of C o 2 + is studied at 45 °C using a Rotating Disc Electrode to elucidate the impacts of fluid motion and solid C o 3 + product formation on the anode reaction rate. The electrolyte is 40% KOH saturated with C o 2 + and the anode is nickel. Inducing laminar flow with rotation at speeds up to 2500 RPM is shown to increase the current density from 1 mA c m - 2 to 2--5 mA c m - 2 at potentials greater than -0.21 Volts vs. Ag/AgCl. At higher current densities anticipated for commercial application, Electrode passivation is a relevant concern. However, bulk electrolysis and cyclic voltammetry---with the latter interpreted using a reaction model to account for the fluid motion---demonstrate that the solid C o 3 + deposit is not passivating, but electrochemically active. Deposits up to ≈ 1 mm thick increase the current, with a sixfold increase demonstrated at 2000 RPM.
