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标题：Examining the influence of electrosynthesis conditions on the composition of tin-oxide catalyst
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作者：Victor Vargalyuk ; Kateryna Plyasovskaya ; Irina Sknar 等
期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2017
卷号：5
期号：6
页码：29-34
DOI：10.15587/1729-4061.2017.110000
语种：English
出版社：PC Technology Center
摘要：Tin dioxide can serve as an active material in micro- and optoelectronics, energy generation, and catalysis. Its synthesis method is determined by the scope of its application. We established regularities in the electrochemical synthesis of a catalytically-active oxide mixture on the surface of tin in alkaline solutions. By employing the original coulometric method we determined quantitative composition of the electrochemically-obtained oxide films in a wide range of formation potentials. At an electrode potential of ‒0.3, the molar ratio of Sn(II)/Sn(IV) is equal to unity. Based on the analysis of processes that might occur under the specified conditions of electrosynthesis, it can be assumed that the surface of tin is coated with a thin layer of SnSnO3. Amorphous nature of the electrode surface, passivated at ‒0.3 V, indirectly confirms this assumption. At a potential of 3.0 V, the oxide film’s content of Sn(IV) is 59 % (mol), Sn(II) ‒ 41 % (mol). Consequently, the film contains 18 % (mol) of SN(IV), which is not included in the composition of SnSnO3. In other words, active tin dioxide is formed exactly at such a potential. Catalytic activity of the obtained materials is demonstrated on the example of methyl tert-butyl ether electrooxidation. The starting concentration of MTBE on the tin electrode, oxidized at 3.0 V, is reduced by 98 % within 180 minutes, while only 73 % of MTBE is decomposed over the same time on a nickel electrode.
关键词：electrosynthesis;tin dioxide;tin electrode;catalytic activity;composition of oxide mixture