Selenium(IV) Electrochemistry on Silver: A Combined Electrochemical Quartz-Crystal Microbalance and Cyclic Voltammetric Investigation

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Title:Selenium(IV) Electrochemistry on Silver: A Combined Electrochemical Quartz-Crystal Microbalance and Cyclic Voltammetric Investigation
Creators:
Pezzatini, Giovanni
Loglio, Francesca
Innocenti, Massimo
Foresti, Maria Luisa
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 68, 9, pp. 1579-1595
Uncontrolled Keywords:Silver, Selenium, Cyclic voltammetry, Selenides, EQCM, Electroreduction, Electrodeposition

Abstract

The electrochemical behavior of Se(IV) on silver was investigated by cyclic voltammetry and electrochemical quartz-crystal microbalance (EQCM) measurements. As already reported in the literature, Se(IV) electrochemistry is always complex, and on silver even more, due to the formation of a compound. Our results confirm that the reduction process of Se(IV) occurs through two reaction paths, Se(IV) → Se(0) and Se(IV) → Se(-II); the product Se(-II) then reacts with Se(IV) through a comproportionation reaction. The latter step leads to red Se that, according to the literature, is the only electroactive form of Se(0). The presence of the electroactive red Se is evident both in the negative range of potentials, through the reduction Se(0) → Se(-II), and in the less negative range of potentials, through the oxidation Se(0) → Se(IV). Moreover, our measurements pointed to the formation of a deposit that never redissolves. This deposit seems to be the electroinactive gray Se. The electrochemical behavior of Se(IV) was investigated in the whole potential range accessible on silver. Our results confirm the occurrence of competitive processes whose predominance depends on the scan rate, as well as on the potential limits of voltammetry. A detailed table with the processes occurring in different potential ranges was drawn up. <p>

Title:Selenium(IV) Electrochemistry on Silver: A Combined Electrochemical Quartz-Crystal Microbalance and Cyclic Voltammetric Investigation
Creators:
Pezzatini, Giovanni
Loglio, Francesca
Innocenti, Massimo
Foresti, Maria Luisa
Uncontrolled Keywords:Silver, Selenium, Cyclic voltammetry, Selenides, EQCM, Electroreduction, Electrodeposition
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:68
Number:9
Page Range:pp. 1579-1595
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20031579UNSPECIFIED
ID Code:2139
Item Type:Article
Deposited On:06 Feb 2009 17:16
Last Modified:06 Feb 2009 16:16

Citation

Pezzatini, Giovanni; Loglio, Francesca; Innocenti, Massimo; Foresti, Maria Luisa (2003) Selenium(IV) Electrochemistry on Silver: A Combined Electrochemical Quartz-Crystal Microbalance and Cyclic Voltammetric Investigation. Collection of Czechoslovak Chemical Communications, 68 (9). pp. 1579-1595. ISSN 0010-0765

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