Polypyrrole-Fe2O3 nanohybrid materials for electrochemical storage

We report on the synthesis and electrochemical characterization of nanohybrid polypyrrole (PPy) (PPy/Fe2O3) materials for electrochemical storage applications. We have shown that the incorporation of nanoparticles inside the PPy notably increases the charge storage capability in comparison to the “pure” conducting polymer. Incorporation of large anions, i.e., paratoluenesulfonate, allows a further improvement in the capacity. These charge storage modifications have been attributed to the morphology of the composite in which the particle sizes and the specific surface area are modified with the incorporation of nanoparticles. High capacity and stability have been obtained in PC/NEt4BF4 (at 20 mV/s), i.e., 47 mAh/g, with only a 3% charge loss after one thousand cyles. The kinetics of charge–discharge is also improved by the hybrid nanocomposite morphology modifications, which increase the rate of insertion–expulsion of counter anions in the bulk of the film. A room temperature ionic liquid such as imidazolium trifluoromethanesulfonimide seems to be a promising electrolyte because it further increases the capacity up to 53 mAh/g with a high stability during charge–discharge processes

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Stereochemical and structural informations have been obtained by 1D and 2D 19F NMR spectroscopy of solutions containing a diamagnetic cation Ga(III) and a fluorinated ligand named 5-fluoro-8-hydroxyquinoline (Fox). In organic medium (DMF-d7), and at low temperature, Ga(Fox)3 has been studied in details using homo- and heteronuclear correlations

Spin Interaction in Octahedral Zinc Complexes of Mono- and Diradical Schiff and Mannich Bases

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A redox active switch for lanthanide luminescence in phenolate complexes

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Distorted copper( ii ) radicals with sterically hindered salens: electronic structure and aerobic oxidation of alcohols

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