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First Examples of Hybrids Based on Graphene and a Ring‐Shaped Macrocyclic Polyoxometalate: Synthesis, Characterization, and Properties
Author(s) -
Li Shiwen,
Liu Rongji,
Ngo Biboum Rosa,
Lepoittevin Bénédicte,
Zhang Guangjin,
Dolbecq Anne,
Mialane Pierre,
Keita Bineta
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201218
Subject(s) - polyoxometalate , graphene , chemistry , raman spectroscopy , x ray photoelectron spectroscopy , cyclic voltammetry , electrochemistry , graphite oxide , oxide , inorganic chemistry , chemical engineering , nanotechnology , electrode , organic chemistry , materials science , catalysis , physics , engineering , optics
Abstract This work introduces facile synthetic methods of two new classes of green materials based on graphene (G) and the macrocyclic polyoxometalate [H 7 P 8 W 48 O 184 ] 33– (P 8 W 48 ) 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 P 8 W 48 on the resulting G sheets, water‐dispersible P 8 W 48 @G hybrids were obtained without the need for surfactant or polymeric stabilizers. The P 8 W 48 @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 P 8 W 48 in comparison with those observed with glassy carbon. Moreover, P 8 W 48 @G‐ and P 8 W 48 @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.