Thin Layer Electrochemical Studies Using Controlled Potential or Controlled Current.

1965 ◽  
Vol 37 (11) ◽  
pp. 1312-1316 ◽  
Author(s):  
D. M. Oglesby ◽  
S. H. Omang ◽  
C. N. Reilley
Keyword(s):  
Thin Layer ◽  
Electrochemical Studies ◽  
Controlled Potential

Thin Layer Electrochemical Studies of ZnS, ZnSe, and ZnTe Formation by Electrochemical Atomic Layer Epitaxy (ECALE)

1996 ◽  
Vol 451 ◽  
Author(s):  
Lisa P. Colletti ◽  
Sajan Thomas ◽  
Elvin M. Wilmer ◽  
John L. Stickney
Keyword(s):  
Thin Layer ◽  
Atomic Layer ◽  
Electrochemical Studies ◽  
Zinc Deposition ◽  
Initial Information ◽  
Zinc Compounds ◽  
Thermodynamic Effects ◽  
S Curve ◽  
The Stability ◽  
Limited Process

ABSTRACTThin-layer electrochemical studies of the underpotential deposition (UPD) of Zn, Te, Se, and S on polycrystalline Au substrates have been performed. These studies were initiated to investigate the electrodeposition of ZnTe, ZnSe, and ZnS by electrochemical ALE (ECALE). Zn UPD on Au begins at -0.5 V and results in a coverage of 0.47 monolayer (ML). Te and Se atomic layers were formed using a two step process where bulk chalcogenide was removed by reduction, leaving the atomic layer. The reduction of the last atomic layer of Te or Se was not observed, regardless of how negative the potential was scanned. Sulfur atomic layers were spontaneously deposited below -0.6 V from a sulfide solution. Thermodynamic effects are clearly evident during the first monolayer of deposition. Zinc deposition onto Te, Se, and S coated electrodes occurs at progressively more positive potentials as the stability of the zinc compounds increase.This initial information was used to develop ECALE cycles for the compounds, and thin-films were formed by repeated application of the cycles. The dependence of the deposit coverage on the deposition potentials was examined and found to display the characteristic “S” curve of a surface limited process. In addition, the dependence of the coverage on the number of ECALE cycles performed was found to be near the ideal 0.5 ML per cycle for ZnSe and ZnS. The ZnTe coverage per cycle was less than expected indicating that further optimization of deposition conditions is needed.

Simplified Nitrate-Reductase-Based Nitrate Detection by a Hybrid Thin-Layer Controlled Potential Coulometry/Spectroscopy Technique

2013 ◽  
Vol 85 (20) ◽  
pp. 9486-9492 ◽  
Author(s):  
Tingting Wang ◽  
Kevin T. Schlueter ◽  
Bill L. Riehl ◽  
Jay M. Johnson ◽  
William R. Heineman
Keyword(s):  
Nitrate Reductase ◽  
Thin Layer ◽  
Spectroscopy Technique ◽  
Controlled Potential ◽  
Controlled Potential Coulometry

Electrochemical Studies of Organotitanium Nitrogen Fixation Systems

1973 ◽  
Vol 51 (6) ◽  
pp. 815-820 ◽  
Author(s):  
T. Chivers ◽  
E. D. Ibrahim
Keyword(s):  
Cyclic Voltammetry ◽  
Nitrogen Fixation ◽  
Electrochemical Reduction ◽  
Argon Atmosphere ◽  
Electrochemical Studies ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential ◽  
Electron Reduction ◽  
The One ◽  
Ether Solvents

The electrochemical reduction of compounds of the type (π-Cp)2Ti(R)Cl (R = Cl, CH3, C6H5, C5F5, OTiCl(π-Cp)2) in ether solvents has been studied using the techniques of polarography, controlled potential electrolysis, and cyclic voltammetry. The one-electron reduction products, presumably (π-Cp)2TiR (R = CH3, C6F5), are initially green in tetrahydrofuran but, in a dinitrogen or argon atmosphere, they form intensely blue solutions which result from the reaction of (π-Cp)2TiR with tetrahydrofuran solvent.

Electrochemical Studies on Eriochrome Violet B and Its Lanthanide Complexes. II. Controlled-potential Coulometric Studies

1962 ◽  
Vol 15 (3) ◽  
pp. 416 ◽  
Author(s):  
TM Florence ◽  
GH Aylward
Keyword(s):  
Lanthanide Complexes ◽  
Reaction Rate ◽  
Electrochemical Studies ◽  
First Order ◽  
First Order Kinetics ◽  
Polarographic Behaviour ◽  
Controlled Potential

Controlled-potential coulometric studies of Eriochrome Violet B (5-sulpho-2-hydroxy-benzeneazo-2-naphthol) using a stirred mercury pool cathode have shown that four electrons per molecule of dye are required for the reduction and that the amines are the final reduction products both in acidic and basic media. The lanthanide-dye complexes are reduced in a similar manner to the free dye. The reduction of Eriochrome Violet B does not obey first-order kinetics, and the observed reaction rate may be related qualitatively to a disproportionation mechanism involving an unstable hydrazo compound. The coulometric and polarographic behaviour of Eriochrome Violet B has been compared with that of the uranium system, which is well known to involve a disproportionation step.

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