Modified Glassy Carbon Rotating Disk Electrode for Determination of Heterogeneous Reaction Rate Constant of H2O2Decomposition

2015 ◽  
Vol 27 (7) ◽  
pp. 1750-1757
Author(s):  
Seyed Javad Amirfakhri ◽  
Jean-Luc Meunier ◽  
Dimitrios Berk
Keyword(s):  
Rate Constant ◽  
Glassy Carbon ◽  
Reaction Rate ◽  
Heterogeneous Reaction ◽  
Rotating Disk ◽  
Reaction Rate Constant ◽  
Rotating Disk Electrode ◽  
Disk Electrode

Study of electrochemical oxidation and determination of albendazole using a glassy carbon-rotating disk electrode

Il Farmaco ◽  
2005 ◽  
Vol 60 (8) ◽  
pp. 671-674 ◽  
Author(s):  
André L. Santos ◽  
Regina M. Takeuchi ◽  
Marcela P. Mariotti ◽  
Marcelo F. De Oliveira ◽  
Maria V.B. Zanoni ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Glassy Carbon ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode

Effect of homogeneous and heterogeneous reactions on the dispersion of a solute in the laminar flow between two plates

1972 ◽  
Vol 330 (1580) ◽  
pp. 59-63 ◽  
Keyword(s):  
Diffusion Coefficient ◽  
Rate Constant ◽  
Reaction Rate ◽  
Heterogeneous Reaction ◽  
Reaction Rate Constant ◽  
Heterogeneous Reactions ◽  
Parallel Plates ◽  
Homogeneous And Heterogeneous Reactions ◽  
First Order Chemical Reaction ◽  
Taylor Diffusion

The paper presents an analytical solution for the dispersion of a solute in a liquid flowing between two parallel plates in the presence of an irreversible first-order chemical reaction. The effects of both homogeneous and heterogeneous reactions on the dispersion are studied under isothermal conditions. It is found that for homogeneous reaction in the bulk of the liquid, the effective Taylor diffusion coefficient decreases with increase in the reaction rate constant. Further for heterogeneous reaction at the catalytic walls, Taylor diffusion coefficient is also found to decrease with increase in the wall catalytic parameter for fixed reaction rate constant corresponding to the bulk reaction.

Electrochemical dioxygen reduction catalyzed by a (nitro)cobalt(perfluorophthalocyanine) complex and the possibility of a peroxynitro complex intermediate

2015 ◽  
Vol 19 (11) ◽  
pp. 1185-1196 ◽  
Author(s):  
John A. Goodwin ◽  
Johnson Agbo ◽  
Justin Zuczek ◽  
Auquilla Samuel ◽  
Tyler H. Aslund ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Rotating Disk ◽  
Open Shell ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Carbon Electrode ◽  
Disk Electrode ◽  
Pyridine Ligand ◽  
Dioxygen Reduction

The (nitro)([Formula: see text],[Formula: see text]-dimethyl-4-aminopyridine) complex of perfluorinated cobalt(III) phthalocyanine Co(III)F16Pc(Me2Npy)(NO[Formula: see text] catalyzes the electrochemical oxygen reduction reaction (ORR) in pH 4.0, 7.0, and 10.0 buffer and 0.05 M sulfuric acid solution when deposited on a glassy carbon electrode. Cyclic voltammetry (CV), rotating disk electrode voltammetry (RDE), and rotating ring-disk electrode voltammetry (RRDE) have been used to determine the reduction product as hydrogen peroxide although in concentrations too small to observe by qualitative methods such as oxidation of NaI in solution. The dependence of the values of the peak potentials for the reduction on the pH of the solution and the -log[Me2Npy] are consistent with protonation up to pH 7.6 and pyridine ligand loss during the reduction. The addition of nitrite at 0.1 and 1 M to pH 7.0 solutions in contact with films of CoF16Pc on the glassy carbon electrode decreases the ORR current and shifts the peak potential of the ORR from -0.21 V vs. NHE to -0.19 V vs. NHE. The addition of nitrite at 0.1 and 1 M to films of Co(III)F16Pc(Me2Npy)(NO[Formula: see text] on glassy carbon, however, has no effect on either the current or the potential. While the electrochemical evidence for this proposal is not definitive, modeling has been used to examine the center of reduction in the alternative mechanisms by evaluation of the LUMOs of the hypothetical intermediates in both closed and open shell cases. The formation of five-coordinate Co(II)F16Pc(NO) is proposed to occur initially in the reduction mechanism. It is also possible that O2 reduction takes place at the NO ligand center by way of a nitrogen-bound peroxynitrite intermediate. The [Formula: see text] ligand appears to remain bound during the ORR. Direct coordination of O2 to the metal center requiring a six-coordinate species, Co(III)F16Pc(O[Formula: see text](NO[Formula: see text], Co(II)F16Pc(O[Formula: see text](NO) or [Co(II)F16Pc(O[Formula: see text](NO[Formula: see text]][Formula: see text] and has been considered in DFT modeling studies. The instability of the two-electron reduced, protonation species, [Co(I)F16Pc(NO2OH)][Formula: see text] in its loss of peroxynitrous acid suggests that the reduction of O2 may occur by two one-electron reduction steps rather than a two-electron step.

Determination of the reaction rate constant and activation energy for pressure-induced 2+2 cycloaddition of the C60 fullerene

2002 ◽  
Vol 44 (3) ◽  
pp. 557-559 ◽  
Author(s):  
V. A. Davydov ◽  
L. S. Kashevarova ◽  
A. V. Rakhmanina ◽  
V. M. Senyavin ◽  
N. N. Oleinikov ◽  
...  
Keyword(s):  
Activation Energy ◽  
Rate Constant ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
C60 Fullerene
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