The Mechanism of Water-Soluble Polymer Аdditives and Parameters of the Pulse Electrolysis Effect on the Size Distribution of the Electrolytic Copper Powder

Abstract

The principles of pulse electrolysis modes selection and their effect on the size distribution of the powder electrolytic copper in electrolyte with additions of water-soluble polymers, polyvinylpyrrolidone (PVP) and polyacrylamide (PAA) are considered in the paper. The research conducted with use of chronopotentiometry and potential transients as well as a simulation model of the electrocrystallisation process showed that the values of pulse duration were greater than the transient time of electroactive species and the pause duration equal to the linear part of potential transient was optimum to obtain a powder with a predominant fraction of nanoscale particles . PVP and PAA additives help to reduce the average particle size in the nanoscale fraction copper powder particles to 25-40 nm. Selected current pulse mode effect corresponds to the reduction of the emergence of new centers of crystallization probability and the adatoms on the surface of the cathode movement probability.

Tin Powders Electrodeposition from Choline Chloride Based Ionic Liquid

“…Considering the complex and diverse states of tin in ionic liquids based electrolytes, studying the electroreduction kinetics of tin ions is interesting using not only voltammetric, but also chronopotentiometric and impedance methods. The reduction conditions for the tin ions in ionic liquids, as well as the dendritic morphology of the resulting electrolytic precipitates [6,14] give grounds to consider it promising to obtain electrolytic tin powders from ionic liquids in the processes of nonstationary electrolysis [15][16][17]. Promising application fields for such powders are the anode materials of lithium-ion batteries [19,20], antifriction additives [18], as well as various metal composite materials.…”