High-density graphene/single-walled carbon nanohorn composite supercapacitor electrode with high volumetric capacitance
- High-density graphene/single-walled carbon nanohorn composite supercapacitor electrode with high volumetric capacitance
- 양철민; 김창효; 위재형; 황현태; 한종훈
- Graphene; Single-walled carbon nanohorn; Spray-drying process; Supercapacitor; Electrode bulk density; Volumetric capacitance
- Issue Date
- Applied surface science
- VOL 489-716
- The low density of porous carbon nanomaterials for supercapacitor electrodes has limited their widespread application, despite their ultra-high gravimetric capacitance. In this work, we successfully prepared highly densified composite electrodes of graphene and single-walled carbon nanohorns (SWCNHs) using a simple spray-drying method that is suitable for mass production. To prepare the high-density composite electrodes, water-based mixtures of oxidized SWCNHs (NHOs) and graphene oxides (GOs) were spray-dried in heated air; after spray-drying, GOs dispersed in water were agglomerated in spherical clusters containing NHO nanoparticles. The reduced spray-dried GO/NHO (rS-GO/NHO) composite electrodes exhibited an extremely high bulk density of 1.23  g·cm− 3, which is almost double that of commercial activated carbon (AC) and reduced NHO (r-NHO) electrodes, and three times higher than that of rS-GO electrodes. Of the materials tested, the rS-GO/NHO composite electrode had the highest volumetric capacitance (80  F·cm− 3 at 1  mA·cm− 2) and a low sheet resistance (0.005  Ω· sq.− 1), which are far superior to those of commercial AC (57  2 and 0.293  Ω·sq.− 1, respectively), without the need for a conductive material, such as carbon black. We expect that these high-density graphene/SWCNH composite electrodes with high volumetric capacitances can be substituted for commercial AC materials in energy storage devices, such as supercapacitors.
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