| 초록 |
Nitrogen-doped nanoonion and graphene-carbon nanotube hybrids (NNO/NG-NCNT) were prepared as a non-precious electrocatalytic material for oxygen reduction reaction (ORR). The NNO is a new promising carbon-based catalytic material, and its ORR activity was further improved by mixing with NG-NCNT. This improvement was achieved through the formation of hybrid structure, because the NG-NCNT weakened aggregation of the NNO by working as spacers. The formation of the NNO/NG-NCNT was characterized by Raman spectroscopy, FE-SEM, HR-TEM and XPS. The ORR performance of the NNO/NG-NCNT was studied using rotating disk electrode (RDE) measurement. RDE results indicated that the NNO had higher ORR activity than that of NG/NCNT, and the NNO/NG-NCNT showed superior ORR performance which was comparable to that of the Pt/C. In addition, the NNO/NG-NCNT has excellent long-term durability. Thus, the high ORR performance of the NNO/NG-NCNT makes its potential applications as a metal-free catalyst for ORR. |
