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Express Electroanalysis with Freshly In Situ Renewable Solid Electrodes
Author(s) -
Bek R. Yu.,
Aleksandrova T. P.,
Skvortsova L. I.,
Tarasova V. A.,
Kiryushov V. N.,
Zamyatin A. P.
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200208)14:14<1017::aid-elan1017>3.0.co;2-#
Subject(s) - in situ , electrode , renewable energy , materials science , nanotechnology , environmental chemistry , environmental science , chemistry , chemical engineering , engineering , electrical engineering , organic chemistry
The results of investigations aimed at the development of a method to obtain the surface of solid indicator electrodes, reproducible in area and properties, by mechanical cutting off a thin surface layer (0.1–5 μm) are reported. The best results have been obtained using the cutting knife made of a composite based on diamond powder, which provides the possibility to make more than 10 5 cuts without changing surface area and properties of electrode. To renew the surface of metal electrodes (Pt, Ag, Au, Cu, Cd, Zn, etc.), it is preferable to cut off a layer 4–5 μm thick, while for graphite and graphite‐based compositions preferable thickness of a layer to cut off is 0.1–1.5 μm. Optimal angle at which the knife should be sharpened have been determined for both cases. The design of a sensor allowing fast‐operation renewal of the surface of working electrode under any conditions, including in situ in solution to be analyzed, is discussed. The results of long tests of the developed method of electrode surface renewal are reported. These results evidence that within a series of 10 4 measurements of the analytical signal, electrode surface area is reproduced at an accuracy of s r =0.002–0.006; no indices of changes in surface properties were observed. Evidence for increased electrochemical activity of the surface of a series of electrodes in case of their renewal directly in solution avoiding contact with air is presented. The advantages of the proposed method are illustrated by different techniques for the determination of cations, anions and some organic compounds by means of direct and stripping voltammetry.