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Tetracyanoquinodimethanide adsorbed on a silica gel modified with titanium oxide for electrocatalytic oxidation of hydrazine

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Abstract

The electrocatalytical oxidation of hydrazine at low potential using tetracyanoquinodimethanide adsorbed on silica modified with titanium oxide was investigated by cyclic voltammetry and amperometry. The modified electrode was prepared modifying a carbon paste electrode employing lithium tetracyanoquinodimethanide adsorbed onto silica gel modified with titanium oxide. This electrode showed an excellent catalytic activity and stability for hydrazine oxidation. With this modified electrode, the oxidation potential of hydrazine was shifted toward less positive value, presenting a peak current much higher than those observed on a bare GC electrode. The linear response range, sensitivity and detection limit were, respectively, 2 up to 100 μmol l−1, 0.36 μA l μmol−1, and 0.60 μmol l−1. The repeatability of the modified electrode evaluated in term of relative standard deviation was 4.2% for 10 measurements of 100 μmol l−1 hydrazine solution. The number of electrons involved in hydrazine oxidation (4), the heterogenous electron transfer rate constant (1.08 × 103 mol−1 l s−1), and diffusion coefficient (5.9 × 10−6 cm2 s−1) were evaluated with a rotating disk electrode.

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Acknowledgement

The authors thanks to Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the financial support. A. B. O. thanks the German Academic Exchange Service (DAAD) for the scholarship and Prof. Dr. Johannes Beck, University of Bonn, for the support.

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Authors and Affiliations

  1. Institute of Chemistry, UNICAMP, P.O. Box 6154, 13084-971, Campinas, Sao Paulo, Brazil

    Juliana Canto Duarte, Rita de Cássia Silva Luz, Flavio Santos Damos & Lauro Tatsuo Kubota

  2. Institut für Anorganische Chemie der Universität Bonn, Gerhard-Domagk-Strasse 1, Bonn, Germany

    Adriano Bof de Oliveira

Authors
  1. Juliana Canto Duarte
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  2. Rita de Cássia Silva Luz
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  3. Flavio Santos Damos
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  4. Adriano Bof de Oliveira
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  5. Lauro Tatsuo Kubota
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Correspondence to Lauro Tatsuo Kubota.

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Duarte, J.C., de Cássia Silva Luz, R., Damos, F.S. et al. Tetracyanoquinodimethanide adsorbed on a silica gel modified with titanium oxide for electrocatalytic oxidation of hydrazine. J Solid State Electrochem 11, 631–638 (2007). https://doi.org/10.1007/s10008-006-0209-9

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  • DOI: https://doi.org/10.1007/s10008-006-0209-9

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