Synthesis, characterization and electroanalytical application of a new SiO2/SnO2 carbon ceramic electrode
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- 作者：Jacqueline Arguello ; Hé ; rica A. Magosso ; Richard L ; ers ; Vinicius L. Pimentel ; Yoshitaka Gushikem
- 关键词：Carbon ceramic composite ; Nitrite electrooxidation ; 3-n-Propyl-4-picolinium chloride silsesquioxane
- 刊名：Electrochimica Acta
- 出版年：2010
- 出版时间：15 December 2010
- 年：2010
- 卷：56
- 期：1
- 页码：340-345
- 全文大小：1028 K
文摘
A new SiO2/SnO2 carbon ceramic composite was prepared by the sol–gel method, and its potential application in electrochemistry as a novel electrode material has been studied. The prepared xerogel was structurally and electrochemically characterized by scanning electron microscopy coupled to energy dispersive spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction and cyclic voltammetry. The composite was pressed in a rigid disk-shape and used as a conductive substrate to immobilize a water-soluble organic–inorganic hybrid polymer, 3-n-propyl-4-picolinium chloride silsesquioxane. The oxidation of nitrite was studied on this polymer film coated electrode in aqueous solution using cyclic voltammetry and differential pulse voltammetry. This modified electrode exhibited a better defined voltammetric peak shifted negatively about 60 mV. The linear detection limit found for nitrite was from 1.3 × 10−5 to 1.3 × 10−3 mol l−1 and the detection limit was 3.3 × 10−6 mol l−1.