The kinetics of the electrodeposition of cadmium telluride

1984 ◽  
Vol 37 (4) ◽  
pp. 689 ◽  
Author(s):  
WJ Danaher ◽  
LE Lyons
Keyword(s):  
Aqueous Solution ◽  
Cadmium Telluride ◽  
Second Step ◽  
Disc Electrode ◽  
Electron Reduction ◽  
Kinetics Of ◽  
Rotating Ring Disc Electrode

The kinetics of the electrodeposition of CdTe from an aqueous solution containing CdSO4, TeO2 and H2SO4 were investigated by using a rotating ring-disc electrode. The results for tellurium deposition alone indicated that the reaction occurs through a six-electron reduction of HTeO2+ to H2Te, followed by a reaction between H,2Te and HTeO2+ yielding tellurium. At HTeO2+ concentrations greater than 10-3 M, the second step of this process is very fast and the overall reaction behaves as a four-electron reduction of HTeO2+ to Te: only at lower HTeO2+ concentrations was evidence observed for the six-electron reduction. The electrodeposition of CdTe occurs through two possible pathways: Cd2+ ions can react with H2Te produced during the reduction of HTeO2+ and thus yield CdTe, or tellurium deposited on the electrode can react with Cd2+ to yield CdTe. The two reactions compete with the deposition of pure tellurium. Conditions to deposit stoichiometric CdTe are suggested.

Oxygen Reduction Electrode Properties of Oxide Nanosheet-Based Materials

2008 ◽  
Vol 388 ◽  
pp. 73-76 ◽  
Author(s):  
Yuya Akeboshi ◽  
Naotaka Ohno ◽  
Hirohito Tokuno ◽  
Morihiro Saito ◽  
Jun Kuwano ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Reduction Reaction ◽  
Disc Electrode ◽  
Hydrogen Electrode ◽  
Chemical Methods ◽  
Layered Titanate ◽  
Orr Activity ◽  
Electron Reduction ◽  
Rotating Ring Disc Electrode

Two types of oxide nanosheet-based materials, a H3O+-exchanged layered titanate and restacked titania nanosheets (H3O+-RE) were synthesized by soft chemical methods, and their oxygen reduction reaction (ORR) activities were examined by semi-steady-state voltammetry with a rotating ring-disc electrode at 70°C in 0.05 M H2SO4. Both samples showed similar onset potentials of the ORR, ~ 0.50 vs. reversible hydrogen electrode, while the efficiencies (Eff4) of the 4-electron reduction of oxygen depended on their nanostructures, i.e. the stacking morphology of nanosheets, specific surface area and kinds of cation between the nanosheets. Both H3O+-form samples showed high Eff4 values are compared with Cs+-form layered titanate.and the H+-form restacked titania nanosheets. This reveals that the H3O+ions and the number of the active sites for ORR are related to the ORR activity. The H3O+-RE exhibited the best Eff4 value (> 90%), which is comparable to that of a conventional 20 mass% Pt/C catalyst.

Kinetics and mechanism of the reaction of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione

1990 ◽  
Vol 55 (8) ◽  
pp. 1984-1990 ◽  
Author(s):  
José M. Hernando ◽  
Olimpio Montero ◽  
Carlos Blanco
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Activation Parameters ◽  
Enol Form ◽  
Kinetics And Mechanism ◽  
Kinetic Constants ◽  
Steric Factors ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

The kinetics of the reactions of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione to form the corresponding monocomplexes have been studied spectrophotometrically in the range 5 °C to 16 °C at I 25 mol l-1 in aqueous solution. In the proposed mechanism for the two complexes, the enol form reacts with the metal ion by parallel acid-independent and inverse-acid paths. The kinetic constants for both pathways have been calculated at five temperatures. Activation parameters have also been calculated. The results are consistent with an associative activation for Fe(H2O)63+ and dissociative activation for Fe(H2O)5(OH)2+. The differences in the results for the complexes of heptanediones studied are interpreted in terms of steric factors.

Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

2003 ◽  
Vol 68 (8) ◽  
pp. 1407-1419 ◽  
Author(s):  
Claudio Fontanesi ◽  
Roberto Andreoli ◽  
Luca Benedetti ◽  
Roberto Giovanardi ◽  
Paolo Ferrarini
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Phase Change ◽  
Temperature Effect ◽  
Transition Rate ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Solution Interface ◽  
Phase Transition Kinetics ◽  
Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

scholarly journals Conformation Transition Kinetics of Silk Fibroin in Aqueous Solution Explored Using Circular Dichroism Spectroscopy

2021 ◽  
Vol 6 (8) ◽  
pp. 1735-1740
Author(s):  
Sora Lee ◽  
Soo Hyun Kim ◽  
You‐Young Jo ◽  
Wan‐Taek Ju ◽  
Hyun‐Bok Kim ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Circular Dichroism ◽  
Silk Fibroin ◽  
Circular Dichroism Spectroscopy ◽  
Kinetics Of ◽  
Circular Dichroïsm ◽  
Conformation Transition

scholarly journals Degradation Kinetics of Humic acid in Aqueous Solution by Ozonation Treatment under Different Parameter Conditions

2020 ◽  
Vol 596 ◽  
pp. 012010
Author(s):  
Zafirah Mahyun ◽  
Noor Fazliani Shoparwe ◽  
Ahmad Zuhairi Abdullah ◽  
Abdul Latif Ahmad ◽  
Mardawani Mohamad ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Degradation Kinetics ◽  
Kinetics Of
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