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Fabrication of bimodal micro-mesoporous amorphous carbon-graphitic carbon-reduced graphene oxide composite microspheres prepared by pilot-scale spray drying and their application in supercapacitors

Authors
Kwon, Ha-NaPark, Gi DaeKang, Yun ChanRoh, Kwang Chul
Issue Date
4월-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Microporous materials; Mesoporous materials; Carbon microspheres; Reduced graphene oxide; Supercapacitor; Spray drying
Citation
CARBON, v.144, pp.591 - 600
Indexed
SCIE
SCOPUS
Journal Title
CARBON
Volume
144
Start Page
591
End Page
600
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/66476
DOI
10.1016/j.carbon.2018.12.111
ISSN
0008-6223
Abstract
There has been a demand for a suitable method which is applicable to mass production of electrode materials for supercapacitor. Herein, the synthesis of amorphous carbonegraphitic carbon-reduced graphene oxide (AC-GC-rGO-a) composite microspheres by pilot-scale spray drying/KOH activation is described and their performance as an electrode material is examined. Through pilot-scale spray drying in a 2 m high chamber, large-scale production of precursor (Fe nitrate-dextrin-GO composite) microspheres is realizable. Metallic Fe nanocrystals formed by carbothermal reduction play a role in the transformation of the dextrin-derived amorphous carbon into graphitic carbon layers. Micropores are then formed from the dextrin-derived amorphous carbon by KOH activation, and finally, bimodal pore-structured AC-GC-rGO-a composite microspheres are prepared. In particular, it is revealed that crumpling of the rGO increases the electrical conductivity of the composite microspheres and thus results in a large specific capacitance (408.2 F g(-1)) and enhanced rate performance. Additionally, AC-GC-rGO-a features improved cycling stability, exhibiting a capacity retention of 94.7% after 10,000 cycles at 10 mA g(-1). Therefore, the developed composite surpasses other carbon materials and graphene oxide composites and is potentially suitable for mass production. (C) 2019 Elsevier Ltd. All rights reserved.
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