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Organic−Inorganic Hybrid Films of the Sulfate Dawson Polyoxometalate, [S2W18O62] 4−, and Polypyrrole for Iodate Electrocatalysis

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journal contribution
posted on 2023-04-05, 07:33 authored by Amna Yaqub, Mikhail Vagin, James J. Walsh, Fathima LaffirFathima Laffir, Indherjith Sakthinathan, Timothy McCormac, Mustansara Yaqub

The Dawson-type sulfate polyoxometalate (POM) [S2W18O62]4− has successfully been entrapped in polypyrrole (PPy) films on glassy carbon electrode (GCE) surfaces through pyrrole electropolymerization. Films of varying POM loadings (i.e., thickness) were grown by chronocoulometry. Film-coated electrodes were then characterized using voltammetry, revealing POM surface coverages ranging from 1.9 to 11.7 × 10−9 mol·cm−2 , and were stable over 100 redox cycles. Typical film morphology and composition were revealed to be porous using atomic force microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy, and the effects of this porosity on POM redox activity were probed using AC impedance. The hybrid organic− inorganic films exhibited a good electrocatalytic response toward the reduction of iodate with a sensitivity of 0.769 μA·cm−2 ·μM−1 . 


Dundalk Institute of Technology



ACS Omega 7 (48), pp. 43381-43389


American Chemical Society

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