Room-temperature mechanochemical preparation and electrochemistry properties of polyoxometalate-based inorganic-organic hybrid

Based on the Keggin-type silicotungstic acid and thiourea, a new inorganic-organic hybrid with lamellar shape has been synthesized by a mechanochemical route at room temperature. The heteropolyanions still retained the Keggin-type structure in the hybrid. It was designed as a carbon paste electrode to investigate its electrochemical properties. The sample shows the characteristic electrochemical properties of Keggin-type polyanions, holding three couples of stable and reversible redox peaks in the range of −0.15~−0.73V, which may arise from the maintenance of Keggin-type polyanions and the pore structure of lamina. This work proposed a new synthetic route for polyoxometalates-based hybrid, and offered an effective method to investigate the property of polyoxometalate-based hybrid under the solid state condition. The lamel-shaped organic-POM hybrid has been synthesized by a simple mechanochemical route at room temperature. A three-dimensional bulk-modified carbon paste electrode (I-CPE) was constructed. It shows the characteristic electrochemical properties of Keggin-type polyanions, holding three couples of stable and reversible redox peaks. [Display omitted] •The mechanochemical route was employed to produce the polyoxometalate-based hybrids.•The porous structure of POM-based hybrid particles can be fabricated by this route.•The hybrid maintains the characteristic electrochemical properties of polyanions.