Abstract
The mechanism of forming an ensemble of nanowires by electrodeposition into the pores of polymer membranes in the mode of a constant measured potential difference between the cathode and the reference electrode is considered. It is shown that, after the partial filling of the pores with metal, a rapid increase in the area of these surface microregions leads to a change in the balance between the potential of these areas and a potential decrease in the solution adjacent to this zone. As a consequence, a shift in the cathodic potential of such sites in the positive direction and a corresponding decrease in the local value of the cathodic current density, which helps to equalize the growth rates of individual nanowires, is observed.
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Notes
Quasi-potentiostatic mode is the electrolysis process at a constant potential difference between the cathode and the reference electrode located at a small distance (less than 1 mm) from the cathode surface.
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Funding
The theoretical and computation sections of this study were performed in the Mendeleev University of Chemical Technology. Experiments were carried out as a part of the state grant of the Crystallography and Photonics Federal Research Center, Russian Academy of Sciences, under support from the Federal Agency for Scientific Organizations (agreement no. 007-GZ/Ch3363/26).
NOTATIONE | electrode potential, mV |
ΔE | potential drop in the near cathode area, mV |
h | pore depth, sm |
I | current strength, A |
i | current density, А/cm2 |
k | distance between cathode surface and Luggin capillary tip, cm |
R | resistance, Ω |
r | pore radius, cm |
S | cathodic surface area, cm2 |
t | stage duration, s |
x | relative fraction of metal-free part of the pore |
ρ | specific solution resistance, Ω cm |
(I), (II), (III) | process stages |
0 | initial |
M | measured |
P | pore |
C | cap |
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Translated by D. Kharitonov
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Kruglikov, S.S., Kolesnikov, V.A., Korotkov, V.V. et al. On the Mechanism of the Quasi-Potentiostatic Mode in the Template Electrochemical Synthesis of Nanowires. Theor Found Chem Eng 53, 1024–1027 (2019). https://doi.org/10.1134/S004057951906006X
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DOI: https://doi.org/10.1134/S004057951906006X