Electrocatalitic Detection of Hydrazine Using Chemically Modified Electrodes with Cobalt Pentacyanonitrosylferrate Adsorbed on the 3–Aminopropylsilica Surface

Acelino Sá, Vitor Maraldi, Kely Bonfim, Tamires Souza, Leonardo Paim, Priscila Barbosa, Ana Nakamura and Devaney Carmo

International Journal of Chemistry, 2018, vol. 9, issue 4, 12

Abstract: Cobalt pentacyanonitrosylferrate on the aminopropylsilica silica gel surface (SiCoNP) was previously prepared following two steps. The electrochemical behavior of SiCoNP modified electrode showed two redox couples, the first and second redox couples were observed at anodic potential (Epa)1 = 0.36 and 0.60 V vs. Ag/AgCl attributed to the oxidation of Co(II) to Co(III) and Fe(II)(CN)5NO/Fe(III)(CN)5NO, respectively. The modified carbon paste electrode with SiCoNP was tested in the hydrazine electrooxidation. In the hydrazine electrooxidation, the H+ release was observed and the two metal centers are involved in this process. The proposed mechanism has been described and based on studies of the effect of hydrogen ion concentration in the redox process of bivalent compound formed. Thus a large increase in hydrogen ion concentration promotes the formation of an intermediate electroactive species with an anodic peak at 0.56 V. The nature of this species is not well established but may be related to protonation of cyanide or NO groups present. The modified graphite paste electrode presented a limit of detection of 2.38×10-4 mol L-1 and amperometric sensitivity of 1.37×10-6 A.mol-1.L.

Date: 2018
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.ccsenet.org/journal/index.php/ijc/article/download/69181/38046 (application/pdf)
http://www.ccsenet.org/journal/index.php/ijc/article/view/69181 (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:ibn:ijcjnl:v:9:y:2018:i:4:p:12

Access Statistics for this article

More articles in International Journal of Chemistry from Canadian Center of Science and Education Contact information at EDIRC.
Bibliographic data for series maintained by Canadian Center of Science and Education ().