Porous reduced graphene oxides derived by selective removal and formation of oxygen functional groups and their electrochemical capacitances

Title
Porous reduced graphene oxides derived by selective removal and formation of oxygen functional groups and their electrochemical capacitances
Authors
이성호황상엽이철호이해리손수영조한익
Keywords
graphene oxide; reduced graphene oxide; porous structure; pore forming; electrode materials; capacitance
Issue Date
2021-02
Publisher
Chemical engineering science
Citation
VOL 231, 116301
Abstract
In this study, reduced graphene oxides (rGOs) with a porous structure were synthesized through a facile sequential low-temperature treatment at 150 and 250 °C in air and nitrogen atmosphere, respectively, without toxic chemicals. For the first treatment under oxygen-rich conditions, competitive oxidation and reduction reactions between various kinds of oxygen functional groups were observed, leading to the formation of preferential pore-forming groups such as carboxyl. Weakly bound groups on the GO surface (such as hydroxyl and carboxyl groups) were removed in the second step, leading to the formation of pores and improving electrical conductivity. The rGO suitable for use as an electrode material had a surface area of 636.6 m2/g and a capacitance of 191.3 F/g. Therefore, we believe that this mild treatment could be a potentially cost-effective, efficient, and environmentally friendly strategy to synthesize electrode materials.
URI
http://pubs.kist.re.kr/handle/201004/72711
ISSN
0009-2509
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KIST Publication > Article
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