Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 10-11, Pages 1882-1889Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201201218
Keywords
Polyoxometalates; Graphene; Ionic liquids; Green chemistry; Electrochemistry
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Funding
- Centre Nationale de la Recherche Scientifique (CNRS) [UMR 8000, UMR 8180, UMR 8182]
- Universite Paris-Sud 11
- Universite de Versailles
- Chinese Academy of Science
- National Natural Science Foundation of China (NSFC) [21071146]
- National High Technology Research and Development Program (863) [2012AA062903]
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This work introduces facile synthetic methods of two new classes of green materials based on graphene (G) and the macrocyclic polyoxometalate [H7P8W48O184]33 (P8W48) alone or assembled with an imidazolium-based poly(ionic liquid) (PIL). The polyoxometalate serves as both an efficient graphite oxide reductant and a stabilizer. Owing to the strong adsorption of P8W48 on the resulting G sheets, water-dispersible P8W48@G hybrids were obtained without the need for surfactant or polymeric stabilizers. The P8W48@G hybrids were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and cyclic voltammetry. The presence of G in these hybrids induces an outstanding enhancement in the electrochemical properties of P8W48 in comparison with those observed with glassy carbon. Moreover, P8W48@G- and P8W48@PIL-G-based electrodes exhibit remarkable stability during prolonged potential cycling in various aqueous electrolytes. To the best of our knowledge, these are the first examples of successful syntheses of a high nuclearity polyoxometalate and graphene assemblies that might facilitate photoelectrocatalysis of multielectronic reactions.
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