| 초록 |
Metal-organic frameworks (MOFs) have been used in various applications such as gas separation, storage, and catalysis due to its significantly large surface area and open pore structure. However, MOF-based electrocatalyst still showed low catalytic activity and stability compared to commercial noble metal catalyst. To solve this problem, a small amount of precious metal has been added to the MOF to maximize the performance of the MOF-based electrocatalyst. In this study, we synthesized various sizes of Pt@Co-NC catalysts (50, 200, 500 nm in size). Different solvents affected nucleation and crystal growth rates during MOF synthesis, which resulted in various sizes of ZIF-67 crystals, and we used them as sacrificial templates to grow ZIF-8 on the surface. As ZIF-8 grew on the surface, the excavation of ZIF-67 by heat treatment made the particles hollow. Through the carbonization step and polyol reduction of Pt, hollow Pt@Co-NC catalysts were synthesized The synthesized Pt@Co-NC catalysts were analyzed by XRD, FE-SEM, BET, and electrochemical analysis system. |
