Mirceski, Valentin and Gulaboski, Rubin (2006) Simple Electrochemical Method for Deposition and Voltammetric Inspection of Silver Particles at the Liquid−Liquid Interface of a Thin-Film Electrode. The Journal of Physical Chemistry B, 110 (6). pp. 2812-2820. ISSN 1520-6106
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Abstract
A novel experimental methodology for depositing and voltammetric study of Ag nanoparticles at the waternitrobenzene
(W-NB) interface is proposed by means of thin-film electrodes. The electrode assembly consists
of a graphite electrode modified with a thin NB film containing decamethylferrocene (DMFC) as a redox
probe. In contact with an aqueous electrolyte containing Ag+ ions, a heterogeneous electron-transfer reaction
between DMFC(NB) and Ag+
(W) takes place to form DMFC+
(NB) and Ag deposit at the W-NB interface.
Based on this interfacial reaction, two different deposition strategies have been applied. In the uncontrolled
potential deposition protocol, the electrode is immersed into an AgNO3 aqueous solution for a certain period
under open circuit conditions. Following the deposition step, the Ag-modified thin-film electrode is transferred
into an aqueous electrolyte free of Ag+ ions and voltammetrically inspected. In the second protocol the
deposition was carried out under controlled potential conditions, i.e., in an aqueous electrolyte solution
containing Ag+ ions by permanent cycling of the electrode potential. In this procedure, DMFC(NB) is
electrochemically regenerated at the electrode surface, hence enabling continuation and voltammetric control
of the Ag deposition. Hence, the overall electrochemical process can be regarded as an electrochemical reduction
of Ag+
(W) at the W-NB interface, where the redox couple DMFC+/DMFC acts as a mediator for shuttling
electrons from the electrode to the W-NB interface. Ag-particles deposited at the W-NB interface affect
the ion transfer across the interface, which provides the basis for voltammetric inspection of the metal deposit
at the liquid-liquid interface with thin-film electrodes. Voltammetric properties of thin-film electrodes are
particularly sensitive to the deposition procedure, reflecting differences in the properties of the Ag deposit.
Moreover, this methodology is particularly suited to inspect catalytic activities of metal particles deposited at
the liquid-liquid interface toward heterogeneous electron-transfer reactions occurring at the at the liquidliquid
interface.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Ag-nanoparticles, liquid-liquid interface, biomimetic membranes, ion transfer, voltammetry, catalysis |
| Subjects: | Natural sciences > Chemical sciences Natural sciences > Physical sciences |
| Divisions: | Faculty of Agriculture |
| Depositing User: | Rubin Gulaboski |
| Date Deposited: | 31 Oct 2012 13:13 |
| Last Modified: | 05 Nov 2012 11:05 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/150 |
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