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On the Mechanism of the Quasi-Potentiostatic Mode in the Template Electrochemical Synthesis of Nanowires

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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

  1. 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).

NOTATION

E

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

SUBSCRIPTS AND SUPERSCRIPTS

(I), (II), (III)

process stages

0

initial

M

measured

P

pore

C

cap

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Correspondence to S. S. Kruglikov.

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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

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