Porous reduced graphene oxides derived by selective removal and formation of oxygen functional groups and their electrochemical capacitances
- Porous reduced graphene oxides derived by selective removal and formation of oxygen functional groups and their electrochemical capacitances
- 이성호; 황상엽; 이철호; 이해리; 손수영; 조한익
- graphene oxide; reduced graphene oxide; porous structure; pore forming; electrode materials; capacitance
- Issue Date
- Chemical engineering science
- VOL 231, 116301
- 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.
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