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The generation of molecular active species on the surface of nano-materials has become promising routes to produce efficient electrocatalysts. Development of cost-effective catalysts with high performances for oxygen reduction reaction (ORR) is an important challenge for fuel cell and metal-air battery applications. In this work, we report a novel hybrid produced by room-temperature solution processes using Ni-based organometallic molecules and N-doped graphene-based materials. Chemical and structural characterizations reveal that Ni-containing species are well-dispersed on the surface of graphene network as molecular entity. The hybrid shows excellent electrocatalytic performances for ORR in basic medium with an onset potential of 0.87 V (vs. RHE), superior durability and good methanol tolerance. 相似文献
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Graphene-based electrochemical supercapacitors 总被引:9,自引:0,他引:9
S. R. C. Vivekchand Chandra Sekhar Rout K. S. Subrahmanyam A. Govindaraj C. N. R. Rao 《Journal of Chemical Sciences》2008,120(1):9-13
Graphenes prepared by three different methods have been investigated as electrode materials in electrochemical supercapacitors.
The samples prepared by exfoliation of graphitic oxide and by the transformation of nanodiamond exhibit high specific capacitance
in aq. H2SO4, the value reaching up to 117 F/g. By using an ionic liquid, the operating voltage has been extended to 3·5 V (instead of
1 V in the case of aq. H2SO4), the specific capacitance and energy density being 75 F/g and 31·9 Wh kg−1 respectively. This value of the energy density is one of the highest values reported to date. The performance characteristics
of the graphenes which are directly related to the quality, in terms of the number of layers and the surface area, are superior
to that of single-walled and multi-walled carbon nanotubes. 相似文献
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