Analysis of the anodic processes of 8-hydroxyquinoline in AcOH-AcONa buffer on mercury

1984 ◽  
Vol 49 (2) ◽  
pp. 481-489 ◽  
Author(s):  
Carlos Muller ◽  
José Claret ◽  
Juan M. Feliu ◽  
José Virgili
Keyword(s):  
Electrode Surface ◽  
Electrode Reaction ◽  
Electrode Process ◽  
Frumkin Isotherm ◽  
Polarographic Wave ◽  
Low Concentrations ◽  
Anodic Behaviour ◽  
Polarographic Current ◽  
Current Potential

Polarographic current-potential characteristics for the anodic behaviour of 8-hydroxyquinoline (QH) in a pH ~ 5 aqueous AcOH-AcONa buffer have been examined in detail at low concentrations. The electrode reaction is 2 Hg + 2 QH ⇋ Hg2Q2 + 2 H+ + 2 e. The study of the polarographic wave has been performed introducing the Frumkin isotherm in the treatment of adsorption. Also, the inhibition of electrode process due to the films formed on electrode surface has been discussed.

In Operando Detection of the Physical Properties Change of the Interfacial Electrolyte during Li-Metal Electrode Reaction by Atomic Force Microscopy

2020 ◽  
Author(s):  
Mitsunori Kitta
Keyword(s):  
Atomic Force Microscopy ◽  
Energy Dissipation ◽  
Physical Properties ◽  
Electrode Surface ◽  
Electrode Reaction ◽  
Metal Electrode ◽  
Ion Concentration ◽  
Force Microscopy ◽  
Atomic Force ◽  
Discharge Reaction

This manuscript propose the operando detection technique of the physical properties change of electrolyte during Li-metal battery operation.The physical properties of electrolyte solution such as viscosity (η) and mass densities (ρ) highly affect the feature of electrochemical Li-metal deposition on the Li-metal electrode surface. Therefore, the operando technique for detection these properties change near the electrode surface is highly needed to investigate the true reaction of Li-metal electrode. Here, this study proved that one of the atomic force microscopy based analysis, energy dissipation analysis of cantilever during force curve motion, was really promising for the direct investigation of that. The solution drag of electrolyte, which is controlled by the physical properties, is directly concern the energy dissipation of cantilever motion. In the experiment, increasing the energy dissipation was really observed during the Li-metal dissolution (discharge) reaction, understanding as the increment of η and ρ of electrolyte via increasing of Li-ion concentration. Further, the dissipation energy change was well synchronized to the charge-discharge reaction of Li-metal electrode.This study is the first report for direct observation of the physical properties change of electrolyte on Li-metal electrode reaction, and proposed technique should be widely interesting to the basic interfacial electrochemistry, fundamental researches of solid-liquid interface, as well as the battery researches.

Theory of alternating current polarography. III. Frequency of alternating field and reaction rate

1955 ◽  
Vol 8 (3) ◽  
pp. 322 ◽  
Author(s):  
B Breyer ◽  
HH Bauer ◽  
S Hacobian
Keyword(s):  
Rate Constants ◽  
Reaction Rate ◽  
Electrode Reaction ◽  
Alternating Current ◽  
First Order ◽  
Electrode Reactions ◽  
Polarographic Current

The equation of the A.C. polarographic current for processes where the frequency of the alternating field is comparable with the rate of the electrode reaction is derived. Relative values of equilibrium rate constants of some first order electrode reactions are evaluated experimentally.

Theory of alternating current polarography. I. Equation of the reversible AC polarographic wave

1954 ◽  
Vol 7 (3) ◽  
pp. 225 ◽  
Author(s):  
B Breyer ◽  
S Hacobian
Keyword(s):  
Mercury Electrode ◽  
Inorganic Ions ◽  
Alternating Current ◽  
Polarographic Wave ◽  
Dropping Mercury Electrode ◽  
Concentration Changes ◽  
In Virtue Of ◽  
Alternating Voltage ◽  
Polarographic Current

An equation for the A.C. polarographic current is derived from considerations of concentration changes produced at the dropping mercury electrode in virtue of the superposition of a small sinusoidal alternating voltage onto the direct potential, for the case of reversibly reduced inorganic ions. The equation predicts the magnitude of the A.C. polarographic current at any point on the polarogram.

Electrocapillary measurements at low concentrations of surfactants: Adsorption of tetrabutylammonium cation

1983 ◽  
Vol 48 (4) ◽  
pp. 964-975 ◽  
Author(s):  
Ladislav Novotný ◽  
Ivan Smoler ◽  
Jaroslav Kůta
Keyword(s):  
Surface Tension ◽  
Maximum Energy ◽  
Tetrabutylammonium Perchlorate ◽  
Adsorption Parameters ◽  
Surface Tension Data ◽  
Frumkin Isotherm ◽  
Low Concentrations ◽  
Drop Time

Using drop-time technique with long drop-times achieved by means of a spindle-type capillary with the combination of a interrupted convection the surface tension data of tetrabutylammonium perchlorate in 0.1 mol l-1 NaClO4 in the concentration range 3 . 10-3 mol l-1 down to 10-7 mol l-1 could be measured. The corresponding adsorption parameters have been evaluated both from Langmuir (for Θ ⪬ 0.8) and Frumkin isotherm. The maximum energy of adsorption amounts to -48.1 kJ . mol-1. The dependence of E vs log c (Yesin-Markov plot) carried out in the concentration range 10-7 to 10-3 mol l-1 showed a S-shaped curve.

Influence of Diffusion through a Porous Film under Electrode Surface in Chronoamperometry Problems

2021 ◽  
Vol 413 ◽  
pp. 84-90
Author(s):  
Daniil Bograchev
Keyword(s):  
Diffusion Coefficient ◽  
Electrode Surface ◽  
Effective Diffusion Coefficient ◽  
Effective Diffusion ◽  
Electrode Reaction ◽  
Direct Numerical Simulations ◽  
High Porosity ◽  
Kinetics Of ◽  
Stationary Approximation ◽  
Good Agreement

In the presented work on chronoamperometry, the Cottrell model has been generalized by taking into account a thin porosity layer covering the surface of the electrode and Tafel kinetics of an electrode reaction. The effective diffusion coefficient inside a porosity layer is calculated by Bruggeman’s law. It is shown that in the quasi-stationary approximation of diffusion inside a thin porous layer, the chronoamperometry problem can be solved analytically. The obtained solution has been compared with the results of direct numerical simulations and a good agreement is shown. Limiting cases of the solution related to low and high porosity are considered.

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