A New Method of Analysis of Polarographic Waves

2003 ◽  
Vol 68 (6) ◽  
pp. 1055-1064 ◽  
Author(s):  
Juan Carlos Ruiz-Morales ◽  
Jesús César Rodríguez Placeres ◽  
Manuel Barrera Niebla ◽  
Mariana Cuesta Sánchez
Keyword(s):  
Computer Program ◽  
Kinetic Parameters ◽  
New Method ◽  
Great Precision ◽  
Electrode Processes ◽  
Wave Potential ◽  
Half Wave Potential ◽  
Half Wave ◽  
Thermodynamic And Kinetic Parameters

A method of analysis of polarographic waves of simple electrode processes is proposed. The quasi-reversible half-wave potential, Ec1/2, is involved in the determination of thermodynamic and kinetic parameters of electrode processes. This potential is determined very easily and with great precision. In order to facilitate the use of the method proposed, we have developed a computer program for Windows.

Determination of the half-wave potential of nobelium

1976 ◽  
Vol 38 (6) ◽  
pp. 1171-1173 ◽  
Author(s):  
R.E. Meyer ◽  
W.J. McDowell ◽  
P.F. Dittner ◽  
R.J. Silva ◽  
J.R. Tarrant
Keyword(s):  
Wave Potential ◽  
Half Wave Potential ◽  
Half Wave

Polarographic studies of α-substituted cystines

1967 ◽  
Vol 45 (7) ◽  
pp. 713-717 ◽  
Author(s):  
R. J. Thibert ◽  
R. J. Walton
Keyword(s):  
Hydrochloric Acid ◽  
Linear Relationship ◽  
Diffusion Current ◽  
Polarographic Determination ◽  
Wave Potential ◽  
Titration Curves ◽  
Half Wave Potential ◽  
Half Wave ◽  
Relationship Of

The polarographic determination of some α-substituted cystines in 0.1 N hydrochloric acid, with thymol as a maximum suppressor, was investigated. A linear relationship of the diffusion current to the concentration of the compound was observed. The influence of substituent, thymol concentration, and pH on the apparent half-wave potential and shape of the polarograms was determined. The systems were not reversible.Potentiometric titration curves were obtained for the α-substituted cystines.

ChemInform Abstract: DETERMINATION OF THE HALF-WAVE POTENTIAL OF NOBELIUM

1976 ◽  
Vol 7 (29) ◽  
pp. no-no
Author(s):  
R. E. MEYER ◽  
W. J. MCDOWELL ◽  
P. F. DITTNER ◽  
R. J. SILVA ◽  
J. R. TARRANT
Keyword(s):  
Wave Potential ◽  
Half Wave Potential ◽  
Half Wave

Half-wave potential-ph diagram for the parabenzoquinone system in n,n-dimethylformamide

1969 ◽  
Vol 2 (3) ◽  
pp. 123-132 ◽  
Author(s):  
J. Badoz-lambling ◽  
G. Demange-guerin
Keyword(s):  
Wave Potential ◽  
Half Wave Potential ◽  
Half Wave

scholarly journals Modified Carbon Nanotubes: Surface Properties and Activity in Oxygen Reduction Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1354
Author(s):  
Vera Bogdanovskaya ◽  
Inna Vernigor ◽  
Marina Radina ◽  
Vladimir Sobolev ◽  
Vladimir Andreev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zeta Potential ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Area ◽  
Surface Properties ◽  
Reduction Reaction ◽  
Wave Potential ◽  
Half Wave Potential ◽  
Half Wave

In order to develop highly efficient and stable catalysts for oxygen reduction reaction (ORR) that do not contain precious metals, it is necessary to modify carbon nanotubes (CNT) and define the effect of the modification on their activity in the ORR. In this work, the modification of CNTs included functionalization by treatment in NaOH or HNO3 (soft and hard conditions, respectively) and subsequent doping with nitrogen (melamine was used as a precursor). The main parameters that determine the efficiency of modified CNT in ORR are composition and surface area (XPS, BET), hydrophilic–hydrophobic surface properties (method of standard contact porosimetry (MSP)) and zeta potential (dynamic light scattering method). The activity of CNT in ORR was assessed following half-wave potential, current density within kinetic potential range and the electrochemically active surface area (SEAS). The obtained results show that the modification of CNT with oxygen-containing groups leads to an increase in hydrophilicity and, consequently, SEAS, as well as the total (overall) current. Subsequent doping with nitrogen ensures further increase in SEAS, higher zeta potential and specific activity in ORR, reflected in the shift of the half-wave potential by 150 mV for CNTNaOH-N and 110 mV for CNTHNO3-N relative to CNTNaOH and CNTHNO3, respectively. Moreover, the introduction of N into the structure of CNTHNO3 increases their corrosion stability.

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