| 초록 |
Carbon supported platinum is widely used as a cathode catalyst in PEFC. However, under the cathodic harsh condition, carbon support becomes corroded which directly affect platinum agglomeration and detachment. In the present study, carbon was coated with silica by successive hydrolysis of APTES and TEOS. Shape and thickness of silica layer on carbon could be controlled by changing the concentration and ratio of APTES and TEOS. Platinum nanoparticles are then deposited on the silica coated carbon catalyst support. Physical and electrochemical properties of Pt/SiO2-carbon catalyst were studied by TEM, TGA, nitrogen isotherm, X-ray diffraction and CV. ORR activity and ECSA after potential cycles were measured in order to investigate the catalyst durability enhancement by silica coating. |
