کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5435663 | 1509355 | 2017 | 8 صفحه PDF | دانلود رایگان |
- The nitrogen-doped graphene had a high doping level with 11.7%.
- Co3O4 nanoparticles were homogenously anchored on the nitrogen-doped graphene nanosheets.
- With the synergy between the highly nitrogen-doped graphene and uniform Co3O4 nanoparticles, the HNG/Co3O4 hybrids exhibited enhanced electrochemical performances.
Chemical doping with heterogeneous atoms is an effective method to improve the intrinsic properties of graphene. In this work, a competitive type of highly nitrogen-doped graphene (HNG) and its composites hybridized with Co3O4 nanoparticles were synthesized via simple pre-mixing followed by a hydrothermal method. The highest nitrogen content achieved was 11.7%, which endowed the graphene with superior electrochemical performance. Co3O4 nanoparticles could be obtained with an optimal size of approximately 80-100Â nm and were homogenously anchored on the graphene nanosheets. Because of the synergy between the highly nitrogen-doped graphene and uniform Co3O4 nanoparticles, the HNG/Co3O4 hybrids exhibited enhanced rate capability and cycling stability, which were considerably higher than those of bare HNG and Co3O4. As the current density increased from 0.2 to 5Â AÂ gâ1, 80.6% of the specific capacitance was retained. Moreover, over 84.5% of the original specific capacitance was maintained after cycling 1000 cycles. This study has demonstrated the significance of nitrogen doping on the performance of graphene-based materials for supercapacitor electrodes.
Highly nitrogen-doped graphene and the nanocomposite of uniform Co3O4 nanoparticles decorated on the doped graphene were facilely synthesized. The graphene with highly doping content was conducive to a perfect combination of Co3O4 nanoparticles. With the synergy between the highly nitrogen-doped graphene and uniform Co3O4 nanoparticles, the HNG/Co3O4 hybrid exhibited superior electrochemical performance (see figure).229
Journal: Synthetic Metals - Volume 223, January 2017, Pages 145-152