期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 22, 页码 6972-6978出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201103253
关键词
electrochemistry; exfoliation; graphene; oxygen; surfactants
资金
- National Natural Science Foundation of China [20903105]
A high-yielding exfoliation of graphene at high concentrations in aqueous solutions is critical for both fundamental study and future applications. Herein, we demonstrate the formation of stable aqueous dispersions of pristine graphene by using the surfactant sodium taurodeoxycholate under tip sonication at concentrations of up to 7.1 mg?mL-1. TEM showed that about 8?% of the graphene flakes consisted of monolayers and 82?% of the flakes consisted of less than five layers. The dispersions were stable regardless of freezing (-20?degrees C) or heat treatment (80?degrees C) for 24 h. The concentration could be significantly improved to about 12 mg?mL-1 by vacuum-evaporation of the dispersions at ambient temperature. The as-prepared graphene dispersions were readily cast into conductive films and were also processed to prepare Pt/graphene nanocomposites that were used as highly active electrocatalysts for the oxygen-reduction reaction.
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