Particle and Aerosol Research
Vol. 15, No. 4, December 2019, Pages 183-190
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ISSN : 1738-8716 (Print)
ISSN : 2287-8130 (Online)
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Synthesis of Porous Graphene Balls by the Activation and Aerosol Process for Supercapacitors Application
Chongmin Lee1),2), Hankwon Chang1),2), and Hee Dong Jang
1),2) *)
1)Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources
2)Department of Nanomaterials Science and Engineering, University of Science and Technology
*Corresponding author.
Tel.: +82-42-868-3612, E-mail: hdjang@kigam.re.kr
Received 09 December 2019, Revised 23 December 2019, Accepted 24 December 2019, Available online 31 December 2019
http://dx.doi.org/10.11629/jpaar.2019.15.4.183
Abstracts
Here, we introduce porous graphene balls (PGB) showing superior electrochemical properties as supercapacitor electrode materials. PGB was fabricated via activation of graphene oxides (GO) by H2O2 and aerosol spray drying in series. Effect of activation on the morphology, specific surface area, pore volume, and electrochemical properties were investigated. As-prepared PGB showed spherical morphology containing pores, which lead to the effective prevention of restacking in graphene sheets. It also exhibited a large surface area, unique porous structures, and high electrical conductivity. The electrochemical properties of the PGB as electrode materials of supercapacitor are investigated by using aqueous KOH under symmetric two-electrode system. The highest specific capacitance of PGB was 279 F/g at 0.1 A/g. In addition, the high rate capability (93.8% retention) and long-term cycling stability (92.2%) of the PGB were found due to the facilitated ion mobility between the porous graphene layers.
Keywords
Aerosol spray drying, Porous graphene balls, Supercapacitors