Studies of Cobalt(III) and Chromium(III) Complexes as Mediators in the Silver Nanoparticle Electrosynthesis in Aqueous Media
- Authors: Yanilkin V.V.1, Fazleeva R.R.1, Nastapova N.V.1, Nasretdinova G.R.1, Gubaidullin A.T.1, Berezin N.B.1, Osin Y.N.2
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Affiliations:
- FRC Kazan Scientific Center of RAS
- Interdisciplinary Center “Analytical microscopy,”
- Issue: Vol 54, No 8 (2018)
- Pages: 650-664
- Section: Article
- URL: https://journals.rcsi.science/1023-1935/article/view/189455
- DOI: https://doi.org/10.1134/S1023193518080062
- ID: 189455
Cite item
Abstract
Metal complexes [Cr(bipy)3]3+, [Co(bipy)3]3+, and [Co(sep)]3+ in aqueous media at the potentials of M(III)/M(II) redox couple are shown playing a role of mediators in the electrosynthesis of silver nanoparticles, stabilized in a polyvinylpyrrolidone shell, by means of Ag(I) reduction. [Cr(bipy)3]3+ is consumed under the conditions of long-term preparative electrolysis, the reduction process is accompanied by cathode passivation, therefore, the Ag+ ions complete conversion to the Ag-nanoparticles is unattainable. The two other metal complexes are fully remained unimpaired; the mediated electrosynthesis of the Ag-nanoparticles is carried out well effectively: the Ag-nanoparticles are produced in the solution bulk with a nearly quantitative yield, a theoretical charge being consumed. the [Co(bipy)3]3+-mediated reduction of the Ag+ ions, generated by a silver anode in situ dissolution in the course of single compartment cell electrolysis, is accompanied by the anode metal dispersion and results in the formation of polydisperse Ag-nanoparticles. The summary Ag-nanoparticle current efficiency in the solution bulk comes to 128%. Thus formed Ag-nanoparticles are characterized by using dynamic light scattering, scanning and transmission electron microscopy, and X-ray powder diffraction. The Ag-nanoparticles are spherical, with a mean size of 83 ± 53 nm, or have a form of nanowires, with a length of l = 1216 ± 664 nm and diameter of d = 94 ± 17 nm. The [Co(sep)]3+-mediated AgCl reduction gives ellipsoidal Ag-nanoparticles sized l = 46 ± 19 nm, d = 27 ± 7 nm; the silver crystallite mean size is 20(1)–34.4(9) nm.
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About the authors
V. V. Yanilkin
FRC Kazan Scientific Center of RAS
Author for correspondence.
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420008
R. R. Fazleeva
FRC Kazan Scientific Center of RAS
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420008
N. V. Nastapova
FRC Kazan Scientific Center of RAS
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420008
G. R. Nasretdinova
FRC Kazan Scientific Center of RAS
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420008
A. T. Gubaidullin
FRC Kazan Scientific Center of RAS
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420008
N. B. Berezin
FRC Kazan Scientific Center of RAS
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420008
Yu. N. Osin
Interdisciplinary Center “Analytical microscopy,”
Email: yanilkin@iopc.ru
Russian Federation, Kazan, Tatarstan, 420018