Analytical Sciences

Self-Assembly of Molybdophosphate on a Glassy Carbon Electrode Covalently Modified with Choline and Electrocatalytic Reduction of Iodate

Xiangqin LIN and Chunming JIANG

Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China

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, α-PMo₁₂O₄₀^3-, then were self-assembled on the Ch/GCE through electrostatic interactions for fabrication of an electrochemical sensor, which is denoted as α-PMo₁₂/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 IO₃^-. The content of IO₃^- in a table salt was determined with satisfactory results. The sensor is promising as an electrochemical sensor for the detection of IO₃^-.

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