2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 6: Rare Earths & Ionic Liquids
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 432 pages |
| ISBN: | 978-1-987820-08-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Diamond electrodes in molten salt and aqueous electrolytes: theory, experiment and application.
Inessa Novoselova1; Sergey Volkov1;1INSTITUTE OF GENERAL AND INORGANIC CHEMISTRY, Kiev, Ukraine;
Type of Paper: Regular
Id Paper: 62
Topic: 11
Abstract:
A search for a corrosion resistant, electrochemically active electrode material with stable operating characteristics is a pressing task of the electrochemistry. Electrodes from diamond materials meet the above requirements. The advances made in the synthesis and purposeful change of electrophysical properties of diamonds allow them to be used as electrodes in various electrochemistry applications (indestructible anode, diamond metallization). The addition of alloying additives to the diamonds during the synthesis made it possible to increase conductivity by several orders and to obtain electrodes with semiconducting and even semimetallic properties.
Another way to change electrophysical properties is the diamond surface modification by various techniques: the implantation of metals into the near surface layer and even in the bulk of crystals, the treatment of diamonds by molten salts, and the partial diamond graphitization when heating in an inert atmosphere.
In the present paper, the generalized results are given of the investigation into the electrochemical behavior of electrodes made from monocrystals of dielectric and semiconducting synthetic and natural diamonds, polycrystalline diamond films, compacts from nano- and microdispersed diamond powders in molten salts and aqueous solutions. It is shown that the decisive role in the use of these electrodes is played by the value and type of conductivity of diamond materials, quality (continuity) of films and their resistance to corrosion. Our findings have shown that the use of the studied materials in electrochemical processes has considerable promise. Corrosion, potentiometric and voltammetric investigations of diamond behavior in chloride, chloride-oxide and oxide melts were carried out. On the basis of these studies, new data of halide-oxide systems for obtaining galvanic coatings of refractory metals carbides and carbon coatings at diamonds were elaborated.