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Kinetics and Mechanism of Cathodic Processes at Electrolysis of Cu(NO3)2·3H2O Solutions in Dimethyl Sulfoxide
Corresponding Author(s) : A.K. Mamyrbekova
Asian Journal of Chemistry,
Vol. 28 No. 3 (2016): Vol 28 Issue 3
Abstract
The electrochemical behaviour of copper(II) in dimethyl sulfoxide solutions of copper(II) nitrate trihydrate is investigated. Laws of kinetics of cathodic processes of electrochemical deposition of copper from dimethyl sulfoxide solutions of copper nitrate crystallohydrate have been studied in potentiodynamic mode in 0.004 M solution of Cu(NO3)2·3H2O in DMSO at temperatures 298-328 K. The electroreduction of the complex ions of copper(II) the composition [Cu(DMSO)4(H2O)2]2+ is proceeding in two-stage on the adsorbate molecules of organic solvent electrode. The main kinetic parameters: coefficients of transfer (a), heterogeneous constant of speed (ks) and effective energy of activation (Aef) of process electroreduction of the ions copper(II) in dimethyl sulfoxide, witnessing about quasi-reversible of process were determined. The general speed of cathodic process brakes of more slow second stage, having the mixed nature of control, as compared with stage transfer of first electron was showed. Researches of kinetic laws of electrode processes at electrodeposition of copper from dimethyl sulfoxide electrolytes have shown that electroreduction of copper(II) ions proceeds in two stages: in the field of potentials 0.1 to 0.2 V the limiting stage is the stage of discharge and in the field of potentials 0.1 to 0.5 V braking of process of copper electrodeposition has diffusion nature.
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- P.V. Savenko, S.V. Trachuk, Electrodeposition of Copper from Non-Aqueous Solutions; Deposited in Ukrainian SRISTI 858-Uk 88, Kiev (1988) (in Russian).
- O.V. Guselnikov, S.V. Obraztsov, Electrodeposition of Metals and Alloys from Non-Aqueous Electrolytes; Deposited in SRITEC, Cherkassy, N826-XII 89 (1989) (in Russian).
- R.S. Vahidov, Elektrohimiya, 30, 1165 (1994) (in Russian).
- A.K. Mamyrbekova, Russ. J. Phys. Chem., 87, 414 (2013); doi:10.1134/S0036024413030163.
- N.T. Kudryavtseva and P.M. Vyacheslavova, Practicum on Applied Electrochemistry, Leningrad: Chemistry (1980) (in Russian).
- Z. Galus, Theoretical Basis of Electrochemical Analysis, Mir, Moscow (2004) (in Russian).
- A.K. Mamyrbekova, Russ. J. Gen. Chem., 83, 1799 (2013); doi:10.1134/S1070363213100010.
- V. I. Gorohovskaya and V.M. Gorohovsky, Practicum on Electrochemical Methods of Analysis; Higher School, Moscow (2003) (in Russian).
- H. Matsuda and Y.Z. Ayabe, Elektrochemistry, 59, 494 (1955).
- V.V. Kuznetsov and S.P. Shpanko, Inhibiting and Passivation of Metals, Publishing House of RSU, Rostov-on-Don, pp. 164-165 (1989) (in Russian).
References
P.V. Savenko, S.V. Trachuk, Electrodeposition of Copper from Non-Aqueous Solutions; Deposited in Ukrainian SRISTI 858-Uk 88, Kiev (1988) (in Russian).
O.V. Guselnikov, S.V. Obraztsov, Electrodeposition of Metals and Alloys from Non-Aqueous Electrolytes; Deposited in SRITEC, Cherkassy, N826-XII 89 (1989) (in Russian).
R.S. Vahidov, Elektrohimiya, 30, 1165 (1994) (in Russian).
A.K. Mamyrbekova, Russ. J. Phys. Chem., 87, 414 (2013); doi:10.1134/S0036024413030163.
N.T. Kudryavtseva and P.M. Vyacheslavova, Practicum on Applied Electrochemistry, Leningrad: Chemistry (1980) (in Russian).
Z. Galus, Theoretical Basis of Electrochemical Analysis, Mir, Moscow (2004) (in Russian).
A.K. Mamyrbekova, Russ. J. Gen. Chem., 83, 1799 (2013); doi:10.1134/S1070363213100010.
V. I. Gorohovskaya and V.M. Gorohovsky, Practicum on Electrochemical Methods of Analysis; Higher School, Moscow (2003) (in Russian).
H. Matsuda and Y.Z. Ayabe, Elektrochemistry, 59, 494 (1955).
V.V. Kuznetsov and S.P. Shpanko, Inhibiting and Passivation of Metals, Publishing House of RSU, Rostov-on-Don, pp. 164-165 (1989) (in Russian).