| 초록 |
ORR is one of the most important electrochemical reactions occurring at the cathode of PEMFCs. In general, the most commonly used electrocatalyst for the ORR is based on Pt/C. However, carbon supports often suffer from low durability because of their corrosion problem and Pt agglomerate due to the collapse of carbon. To improve the catalytic activity and durability, highly dispersed Pt on the stable oxide supports with high surface area have been adopted. Among them, TiO2 has been widely used for electrochemical applications. TiO2 is stable but has a poor electrochemical conductivity. Doping n-type dopants is improve the electrical conductivity. In this study, we developed the metal doped-TiO2 support catalyst with SMSI between metal and TiO2. Controlling the morphology of TiO2 into nanotube was used as a strategy to improve the activity and to highly disperse the Pt on the supports with high surface area. The ORR activity and durability of Pt/M-TiO2 nanotube catalysts compared to Pt/C catalyst were tested by three-electrode cell. Based on this, we identified the optimal concentration of metal dopants on the TiO2 nanotube to improve ORR activity and durability with SMSI. |
