Development of copper-stabilized conducting-polymer/polyoxometalate hybrid materials for effective electrochemical charging

Abstract

A hybrid organic-inorganic material composed of poly (3,4-ethylenedioxythiophene), PEDOT, derivatized with 4-(pyrrol-e1-yl) benzoic acid, PyBA, and Keggin-type copper (II)-salt of H 3 PMo 12 O 40 has been proposed here. Such features as good electronic conductivity of PEDOT, hydrophilic and coordination capabilities of PyBA, the ability of copper ( I I ) i o n s t o l i n k P y B A c ar b ox y l i c g r o u p s , a n d phosphomolybdate anionic sites, as well as high protonic and mixed-valence conductivities of H 3 PMo 12 O 40 have been explored here to produce a stable composite material charcterized by reasonable charge propagation dynamics. Characterization and formation of the hybrid ca. 0.6 μm thick PEDOT/PyBA-Cu x H y PMo 12 O 40 films have been asessed by FTIR, XRD, AFM, SEM, as well as using electrochemical methods. Among important feautures of the proposed hybrid system is the ability to undergo reversible charging/ discharhging (both under voltammetric and galvanostatic conditions) in a manner analogous to what is observed in battery--type cells. Typical parameters, such as specific capacity, energy, and power densities, are provided and discussed.

Electrochemical investigation and amperometry determination iodate based on ionic liquid/polyoxotungstate/P-doped electrochemically reduced graphene oxide multi-component nanocomposite modified glassy carbon electrode

“…2,[12][13][14] The multiple redox properties make them attractive candidates in surface modication, electroanalysis, and electrocatalysis. 2,[13][14][15] Different methods have been developed to achieve chemically modied electrodes (CMEs) with POMs such as electrodeposition at a very negative potential, 16,17 adsorption, 18 entrapment into conducting, 19,20 or non-conducting polymers matrixes, 21,22 layer-by-layer self-assembly, 23,24 Langmuir-Blodgett (LB) technique, 25,26 preparation of self-assembled monolayer and multilayer thin-lms, 27 and bulk modication of carbon composites and carbon paste matrices. 28 However, the electrocatalytic activity of POMs-modied electrodes is limited due to their low stability in aqueous solutions 15,27,29 and low specic surface area.…”