Tetra-MnIII-containing 30-Tungsto-4-phosphate, [MnIII 4 (H2O)2(P2W15O56)2]12-: Entrapped PEDOT films, surface analysis and electrochemical study

A Mn-III-substituted Wells-Dawson-type polyoxoanion, [Mn-4(III) (H2O)(2)(P2W15O56)(2)](12-) (Mn-4(P2W15)(2)), was surface immobilised within the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) on a glassy carbon electrode (GCE) surface. The resulting immobilised films were characterised by electrochemical techniques and subjected to a compositional and morphological characterization by means of X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM). The redox activity of the entrapped Mn-4(P2W15)(2) was observed within the polymer phase. The conducting polymer films exhibited a pH-dependant redox activity associated with the polyanion Mn-4(P2W15)(2) and thin layer behaviour up to 100 mVs(-1) with enhanced stability towards redox cycling.

Automated summary

A Mn-III-substituted Wells-Dawson-type polyoxoanion was immobilised on a glassy carbon electrode surface using the conducting polymer poly(3,4-ethylenedioxythiophene). The immobilised films were characterized by electrochemical techniques and surface analysis methods. The Mn-4(P2W15)(2) showed redox activity within the polymer phase and the conducting polymer films exhibited pH-dependant redox activity and enhanced stability.