| 초록 |
Carbon papers (CPs) have been widely investigated as a gas diffusion layer for high performance fuel cells. Herein we report the fabrication of CPs by wet-laying of ozone-treated carbon fibers (CFs) with hydrophilic functional groups. To improve the dispersion of CFs in water, the surface of the CFs was modified by the ozone treatment. The ozone-treated CFs have hydrophilic functional groups such as C-O, C=O and O-C=O. In addition, the negative charge of CFs determined by zeta potential was significantly increased after the ozone treatment. Since ozone-treated CFs were well dispersed in aqueous solution than bare CFs, the prepared CPs by a wet-laying process of ozone-treated CFs have higher porosity and gas permeability than those from bare CFs. In addition, the prepared CPs from ozone-treated CFs showed better performance in I-V measurement of the single cell than those from bare CFs because of their high gas permeability. |
