Electrochemical charging and electrocatalysis at hybrid films of polymer-interconnected polyoxometallate-stabilized carbon submicroparticles
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Using the layer-by-layer technique, carbon submicroparticles, that have been modified and stabilized with monolayers of Keggin-type phosphododecamolybdate (PMo12O403−), can be dispersed in multilayer films of organic polymers, poly(3,4-ethylenedioxythiophene), i.e., PEDOT, or poly(diallyldimethylammonium) chloride, i.e., PDDA, deposited on glassy carbon or indium-tin oxide conductive glass electrodes. The approach involves alternate treatments in the colloidal suspension of PMo12O403−-covered carbon submicroparticles in the solution of monomer, 3,4-ethylenedioxythiophene or in solution of PDDA polymer. Electrostatic attractive interactions between anionic phosphomolybdate-modified carbon submicroparticles and cationic polymer layers permit not only uniform and controlled growth of the hybrid organic–inorganic film but also contribute to its overall stability. The system composed of PMo12O403−-covered carbon submicroparticles dispersed in PEDOT is characterized by fast dynamics of charge transport and has been used to construct symmetric microelectrochemical redox capacitor. The PDDA-based system has occurred to be attractive for electrocatalytic reduction of hydrogen peroxide.
KeywordsPhosphomolybdate Monolayers Carbon particles Poly(diallyldimethylammonium) chloride Poly(3,4-ethylenedioxytiophene) Organic–inorganic networks Multilayer composite films
This research was supported by Ministry of Science and Information Technology (Poland) under the State Committee for Scientific Research (KBN) grant 7 T09A 05426. Support from the French–Polish Polonium Project is also acknowledged. M.Ch. appreciates fellowship from the Foundation for Polish Science (FNP).
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