期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 10, 页码 3422-3427出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm03175e
关键词
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资金
- MOE (Singapore) [AcRF Tier 1 RG 31/08, MOE2010-T2-1-060]
- Singapore Ministry of Education [MOE2010-T2-1-017]
- [NRF2009EWT-CERP001-026]
- [NRF-CRP4-2008-03]
We report a facile approach to synthesize nanocomposites with Fe3O4 nanopaticles (NPs) attached to reduced graphene oxide (rGO) sheets by a solvothermal process, which combines the growth of Fe3O4 NPs and the reduction of GOs in one single step. These Fe3O4/rGO nanocomposites were further used to fabricate thin film supercapacitor electrodes by using a spray deposition technique without the addition of insulating binders. It was found that the Fe3O4/rGO nanocomposites showed much higher specific capacitances than that of either pure rGO or pure Fe3O4 NPs. We further carried out electrochemical characterization of the Fe3O4/rGO nanocomposites with different Fe3O4 : rGO weight ratios (e.g. I-Fe3O4 : rGO) and showed that Fe3O4/rGO nanocomposites with I-Fe3O4 : rGO 2.8 exhibited the highest specific capacitance of 480 F g(-1) at a discharge current density of 5 A g(-1) with the corresponding energy density of 67 W h kg(-1) at a power density of 5506 W kg(-1). These Fe3O4/rGO nanocomposites also showed stable cycling performance without any decrease in the specific capacitance after 1000 charge/discharge cycles.
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