Formation of powdered copper deposits by square-wave pulsating overpotential

Popov, Konstantin; Maksimović, M.D.; Pavlović, Marko; Ostojić, Gordana

doi:10.1007/bf01059174

Cited by 19 publications

(2 citation statements)

References 6 publications

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“…By contrast, under different conditions, capacitance effects were shown to lead to an increase in the dendrite concentration with frequency, i.e., to produce a rougher deposit . The frequency of both voltage and current pulses was shown to have a particularly large effect on the size distribution of electrodeposited metal powders, although no definite trends could be established. A theoretical analysis of systems under stable periodic voltage and current conditions 4,7 rationalized the experimental observations of an increased deposit uniformity with increasing frequency.…”

Section: Introductionmentioning

confidence: 95%

AC-Driven Interfacial Electrodeposition of Silver

1997

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Two-dimensional interfacial electrodeposition of silver is studied under alternating square-wave electric potential conditions, at the water/dichloromethane interface. The overall rate of growth is found to increase with frequency. The deposit's morphology also depends strongly on the frequency: at ≤10 Hz compact deposits are formed while at 1−10 kHz highly ramified structures develop, the branches in which tend to broaden out at higher frequencies. At ∼100 Hz a highly disordered growth is observed. A novel pulsating behavior of the deposit size is observed, with alternating contractions and growth phases. The contractions are attributed to a mechanical compaction of the newly-formed deposit, driven by the fast changes in surface tension due to the voltage variation. The mechanical oscillations induce hydrodynamic stirring in the solution, affecting the mass-transport of the reacting silver ions to the electrode, and, consequently, the rate of growth and morphology of the deposit.

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Section: Introductionmentioning

confidence: 95%

AC-Driven Interfacial Electrodeposition of Silver

1997

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“…In particular, electroplating characteristics may be significantly altered by periodic reaction control (20). The morphology of an electrodeposit may be controlled under periodic potential or current manipulation (21)(22)(23)(24)(25)(26)(27)(28), and electrodeposited alloy composition may be changed by periodic reaction control (29)(30)(31). Electrodeposition under periodic reaction control at mass-transfer-limited conditions has also received attention (32)(33)(34)(35)(36)(37).…”

Section: Periodic Control Of Reaction Ratesmentioning

confidence: 99%

Selectivity Changes in Electrochemical Reaction Sequences by Modulated Potential Control

Fedkiw

Scott

1984

J. Electrochem. Soc.

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Electro-organic reactions typically involve the electrochemical generation of a reactive intermediate which may participate in further chemical or electrochemical reactions. It is possible to effect the product distribution in such branched reaction networks by modulating the electrode potential. Reaction rate calculations under electrokineticcontrolled conditions for four reaction mechanisms, each involving an electrogenerated intermediate, are presented for step-and sinusoidal-potential modulation. The results show that reactor operating conditions unobtainable under steady potential control are possible. The cycle-averaged selectivity and yield of selected products may be significantly increased at the stationary state in comparison to those at an identical production rate but under dc conditions. The effect of modulation is frequency dependent; for some reaction sequences, the reaction trend at low frequency may be opposite than that at high frequency. The relative rates of a chemical reaction in parallel with an electrochemical reaction, both involving the intermediate, are more sensitive to potential modulation than either two parallel chemical or electrochemical reactions. Mass transfer limitations dampen the results of modulation. Reactor performance increases under modulated potential (or current) control possibly may be significant enough to make an electrochemical processing route economically viable. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 147.188.128.74 Downloaded on 2014-11-16 to IP Vol. 131, No. 6 ELECTROCHEMICAL REACTION SEQUENCES 1305

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Electrodeposition at a Periodically Changing Rate

Fundamental Aspects of Electrometallurgy

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Formation of powdered copper deposits by square-wave pulsating overpotential

Cited by 19 publications

References 6 publications

AC-Driven Interfacial Electrodeposition of Silver

AC-Driven Interfacial Electrodeposition of Silver

Selectivity Changes in Electrochemical Reaction Sequences by Modulated Potential Control

Electrodeposition at a Periodically Changing Rate

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