期刊
COMPOSITES PART B-ENGINEERING
卷 161, 期 -, 页码 37-43出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2018.10.055
关键词
Sonochemistry; Graphene; MnO2; Composites; Supercapacitors
资金
- National Natural Science Foundation of China [51673061, 51273057, 21503282]
- Program for New Century Excellent Talents in University [NCET12-0709]
- Graphene R&D Center of SCUN
The past decade has witnessed substantial achievements on electrochemical energy storage in employing graphene-based composites; however, of which have been usually produced on a laboratory scale with a limited compatibility with future industrialization. Herein a facile, cheap, and scalable sonochemical method was developed to prepare MnO2/graphene composite electrodes for supercapacitors. Petal-like MnO2 arrays were densely grown on the surface of graphene oxide followed by annealing at 220 degrees C under an air atmosphere. The as-fabricated MnO2/graphene hierarchical composite electrodes deliver 292.9 and 156.1 F/g at 5 and 100 mV/s, respectively, showing higher specific capacitance and better rate capability compared to the MnO2 electrode. An excellent cyclability with a capacitance retention as high as 91.5% was also achieved for the composite electrodes after running 1000 cycles. Such excellent electrochemical performances are ascribed to the robust composite structure and synergetic contribution from petal-like MnO2 arrays and conductive graphene sheets.
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