| 초록 |
A single-walled carbon nanotube (SWNT) is considered as one of promising support materials for catalysts in the proton exchange membrane fuel cell (PEMFC) owing to its superior conductivity and durability compared to the carbon black. However, the SWNT severely aggregates in the hydrophilic solvents such as alcohol, water, etc., which limits the application to the catalysts for the PEMFC. To address this issue, polymer wrapping on the SWNT can improve the dispersion state of SWNT in the hydrophilic solvents. Therefore, the procedure of the polymer wrapping on the SWNT was investigated to improve the dispersion state of SWNT. Specifically, dimethylformamide and N-methylpyrrolidone were used as dispersing solvents and different rotating speeds were implemented by 5,000 rpm, 10,000 rpm, and 15,000 rpm. The high-resolution transmission electron microscopy equipped with the energy dispersive x-ray spectroscopy was employed to examine the degree of polymer wrapping on the SWNT. |
