Self-assembly of molybdophosphate on a glassy carbon electrode covalently modified with choline and electrocatalytic reduction of iodate.
Choline can be covalently grafted on glassy carbon electrodes using cyclic voltammetric method, forming a stable cationic monolayer-modified electrode (Ch/GCE). Keggin-type molybdophosphate anions, alpha-PMo(12)O(40)(3-), then were self-assembled on the Ch/GCE through electrostatic interactions for fabrication of an electrochemical sensor, which is denoted as alpha-PMo(12)/Ch/GCE. This two-layer modified electrode was carefully characterized by cyclic voltammetry and X-ray photoelectron spectroscopy. It was found that the sensor exhibits strong electrocatalytic activity and sensitivity toward the reduction of IO(3)(-). The content of IO(3)(-) in a table salt was determined with satisfactory results. The sensor is promising as an electrochemical sensor for the detection of IO(3)(-).
Lin
Xiangqin
X
Department of Chemistry, University of Science and Technology of China, Hefei, R. R. China. xqlin@ustc.edu.cn
Jiang
Chunming
C
D000838:Anions; D002384:Catalysis; D002412:Cations; D002794:Choline / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005898:Glass; D007452:Iodates / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D010084:Oxidation-Reduction; D010756:Phosphoric Acids / Q000737:chemistry*
D000838:Anions; D002412:Cations; D007452:Iodates; D010756:Phosphoric Acids; D008982:Molybdenum; D002794:Choline; C003125:phosphomolybdic acid