Electrocatalytic Determination of Nitrite on a Rigid Disk Electrode Having Cobalt Phthalocyanine Prepared In Situ
✍ Scribed by Thiago C. Canevari; Rita C. S. Luz; Yoshitaka Gushikem
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 419 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
Abstract
This work reports an in situ cobalt(II) phthalocyanine (CoPc) synthesis on a SiO~2~/SnO~2~ (SiSn) matrix surface obtained by the sol‐gel method and its electrocatalytic activity for oxidation of nitrite. A rigid disk electrode with SiSn/CoPc was used to study the electrooxidation of nitrite by the cyclic voltammetric, chronoamperometric techniques and differential pulse voltammetry (DPV). The adsorbed phthalocyanine electrocatalyzed nitrite oxidation at 0.73 V (versus SCE) using the DPV technique. The anodic peak current intensities, plotted from differential pulse voltammograms in 1 mol L^−1^ KCl for the concentration range 0.002 to 3.85 mmol L^−1^ of nitrite were linear, with a correlation coefficient of 0.998 and a detection limit of 0.95 μmol L^−1^.