Electrochemical Reduction of Nitrous Oxide (N2O) Catalysed by Tetraaminophthalocyanatocobalt(II) Adsorbed on a Graphite Electrode in Aqueous Solution

1997 ◽  
Vol 01 (04) ◽  
pp. 323-331 ◽  
Author(s):  
JIUJUN ZHANG ◽  
YU-HONG TSE ◽  
A. B. P. LEVER ◽  
W. J. PIETRO
Keyword(s):  
Aqueous Solution ◽  
Nitrous Oxide ◽  
Electrochemical Reduction ◽  
Modified Electrode ◽  
Electrocatalytic Activity ◽  
Graphite Electrode ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Ph Range

The surface electrochemical response of the Co II/ Co I redox process of tetraaminophthalocyaninatocobalt(II) ( Co II TAPc ) adsorbed on a graphite electrode, was studied in the pH range of 2–13. In aqueous solution, the Co II TAPc adsorbed graphite electrode displays very strong electrocatalytic activity toward N 2 O reduction to N 2, a process which was examined by cyclic and rotating disk electrode voltammetries. The possible application of this Co II TAPc modified electrode in N 2 O analysis was explored.

Synthesis of Bimetallic AuPt Nanoparticles in Aqueous Solution and Electrocatalytic Activity

2005 ◽  
Vol 900 ◽  
Author(s):  
Peter N. Njoki ◽  
Jin Luo ◽  
Aisley Jacob ◽  
Rizwan Munawar ◽  
Bilal Khan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electrocatalytic Activity ◽  
Bimetallic Nanoparticles ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Morphological Properties ◽  
Nanoparticle Catalysts ◽  
Bimetallic Nanoparticle

ABSTRACTThe ability to control composition and size in the synthesis of bimetallic nanoparticles is important for the exploitation of the bimetallic catalytic properties. This paper reports recent findings of an investigation of the synthesis of gold-platinum (AuPt) bimetallic nanoparticles in aqueous solution via reduction of AuCl4− and PtCl42− using a combination of reducing and capping agents. In addition to characterization of the morphological properties of the AuPt nanoparticles using TEM and XRD, the electrocatalytic activity of the carbon-supported AuPt nanoparticle catalysts was also examined for oxygen reduction reaction (ORR) using the rotating disk electrode (RDE) technique. The findings have implications to the design of bimetallic nanoparticle catalysts for fuel cell reactions.

scholarly journals Accurate Assessment of the Oxygen Reduction Electrocatalytic Activity of Mn/Polypyrrole Nanocomposites Based on Rotating Disk Electrode Measurements, Complemented with Multitechnique Structural Characterizations

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Patrizia Bocchetta ◽  
Carolina Ramírez Sánchez ◽  
Antonietta Taurino ◽  
Benedetto Bozzini
Keyword(s):  
Oxygen Reduction ◽  
Electrocatalytic Activity ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Activity Measurement ◽  
Disk Electrode ◽  
Atomic Force ◽  
Structural Characterizations

This paper reports on the quantitative assessment of the oxygen reduction reaction (ORR) electrocatalytic activity of electrodeposited Mn/polypyrrole (PPy) nanocomposites for alkaline aqueous solutions, based on the Rotating Disk Electrode (RDE) method and accompanied by structural characterizations relevant to the establishment of structure-function relationships. The characterization of Mn/PPy films is addressed to the following: (i) morphology, as assessed by Field-Emission Scanning Electron Microscopy (FE-SEM) and Atomic Force Microscope (AFM); (ii) local electrical conductivity, as measured by Scanning Probe Microscopy (SPM); and (iii) molecular structure, accessed by Raman Spectroscopy; these data provide the background against which the electrocatalytic activity can be rationalised. For comparison, the properties of Mn/PPy are gauged against those of graphite, PPy, and polycrystalline-Pt (poly-Pt). Due to the literature lack of accepted protocols for precise catalytic activity measurement at poly-Pt electrode in alkaline solution using the RDE methodology, we have also worked on the obtainment of an intralaboratory benchmark by evidencing some of the time-consuming parameters which drastically affect the reliability and repeatability of the measurement.

Evaluation of the diffusion coefficient of the zincate ion using a rotating disk electrode

1986 ◽  
Vol 64 (3) ◽  
pp. 523-527 ◽  
Author(s):  
Elisabete Jorge Pessine ◽  
Silvia M. L. Agostinho ◽  
Hélio C. Chagas
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Experimental Results ◽  
Alkali Concentration ◽  
Disk Electrode ◽  
Disc Electrode ◽  
Einstein Theory ◽  
Temperature Range

Using a rotating Hg-film disc electrode, the diffusion coefficient of the zincate ion in a 1–4 M aqueous solution of NaOH was measured. Experiments covered a temperature range from 25 to 40 °C. The experimental results are in agreement with the predictions of the Stokes–Einstein theory for diffusivity. The obtained Stokes radii decrease with increasing alkali concentration, but the ratio Dη/T is reasonably constant within the whole range of temperature investigated

scholarly journals Rotating disk electrode study of electrocatalytic oxidation of ascorbate at Prussian blue modified electrode

2009 ◽  
Vol 7 (4) ◽  
pp. 739-744 ◽  
Author(s):  
Rūta Araminaitė ◽  
Rasa Garjonytė ◽  
Albertas Malinauskas
Keyword(s):  
Prussian Blue ◽  
Modified Electrode ◽  
Electrode Potential ◽  
Electrocatalytic Oxidation ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Solution Ph ◽  
Catalytic Current ◽  
Onset Potential

AbstractElectrooxidation of ascorbate has been studied with the use of a rotating disk electrode. The results obtained show an efficient electrocatalytic oxidation of ascorbate at the Prussian blue (PB) modified electrode to proceed in solutions of pH 5.5 and 7.3. Depending on solution pH, the onset potential for ascorbate electrooxidation at PB modified electrode appears shifted by 0.1–0.2 V to lower values, as compared to an unmodified glassy carbon electrode. Within the electrode potential window of 0.3 to 0.5 V vs. Ag/AgCl, and electrode rotation velocity of 50–2000 rpm, the catalytic current obeys Koutecky-Levich equation at a submillimolar ascorbate concentration. Kinetic current densities, obtained from the data treatment, are higher for a pH 5.5 solution, and also at higher electrode potential.

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