期刊
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
卷 8, 期 -, 页码 2474-2483出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.8.247
关键词
ionic liquids; material synthesis; metal-fluoride nanoparticles; microwave irradiation; thermally reduced graphite oxide
资金
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1708, Ja466/31-1, Ja466/31-2, MA 1280/40-1]
- European Community as part of the EU Graphene Flagship [GAN 696656]
Metal-fluoride nanoparticles, (MFx-NPs) with M = Fe, Co, Pr, Eu, supported on different types of thermally reduced graphite oxide (TRGO) were obtained by microwave- assisted thermal decomposition of transition-metal amidinates, (M{MeC[N(iPr)](2)}(n)) or [M(AMD)(n)] with M = Fe(II), Co(II), Pr(III), and tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium, Eu(dpm)(3), in the presence of TRGO in the ionic liquid (IL)1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]). The crystalline phases of the metal fluorides synthesized in [BMIm][BF4] were identified by powder X-ray diffraction (PXRD) to be MF2 for M = Fe, Co and MF3 for M = Eu, Pr. The diameters and size distributions of MFx@TRGO were from (6 +/- 2) to (102 +/- 41) nm. Energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were used for further characterization of the MFx-NPs. Electrochemical investigations of the FeF2-NPs@TRGO as cathode material for lithium-ion batteries were evaluated by galvanostatic charge/discharge profiles. The results indicate that the FeF2-NPs@TRGO as cathode material can present a specific capacity of 500 mAh/g at a current density of 50 mA/g, including a significant interfacial charge storage contribution. The obtained nanomaterials show a good rate capacity as well (220 mAh/g and 130 mAh/g) at a current density of 200 and 500mA/g, respectively.
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