Preparation of the 12-Molybdophosphoric Acid-Layered Double Hydroxides Nanocomposite Hybrid and its Electrocatalytic Reduction of Halate Ions

Abstract

Polyoxometalates (POMs) possess an excellent property for electrochemical catalysis. A new hybrid complex containing polyoxometalate anions and layered double hydroxide (LDH) was prepared by assembly of Mg-Al LDH precursors in nitrate form with the 12-molybdophosphoric acid anions [PMo₁₂O₄₀]³⁻(PMo₁₂). The properties of the product complexes were characterized by the methods of field-emission scanning electron microscopy (FE-SEM), spectroscopic techniques (UV-vis, FT-IR), elemental analysis (EDS), and electrochemistry. The electrochemical behaviors of the LDH/PMo₁₂ film were investigated by cyclic voltammetry. The result indicated that the LDH/PMo₁₂ nanocomposite films modified electrode exhibited a diffusion-controlled voltammetric feature. The films were able to catalyze the reduction of halate ions (, , and ). Therefore, the prepared nanocomposite films modified electrode had potential application in the electroanalytical field.

Keywords:

• Electrocatalysis
• Electrochemical sensors
• Layered double hydroxides
• Polyoxometalates

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20890022) and the National Key Basic Research Development Project of China (No. 2010CB933602).