| 초록 |
Tuning the structure of carbon electrocatlaysts is of great significance to improve their catalytic activities for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in zinc-air batteries. Covalent organic frameworks (COFs) are good candidates for the synthesis of carbon electrocatalysts due to their controllable crystal structures. Herein, pyridine-linked triazine covalent organic framework (PTCOF) was synthesized, and its electronic structure was modulated by incorporating cobalt nanoparticles on its plane to induce the bifunctional catalytic activities for both ORR and OER. Cobalt nanoparticles-incorporated PTCOF (CoNP-PTCOF) showed low overpotentials for both ORR and OER which are comparable with commercial Pt/C and RuO2. However, CoNP-PTCOF exhibited improved stability than Pt/C and RuO2. With DFT simulations, we found that down-shifted p-band of PTCOF after functionalization of CoNPs, facilitating the adsorption/desorption of oxygen intermediates on active sites. |
