| Autor: |
Ohyama, Junya, Moriya, Makoto, Takahama, Ryo, Kamoi, Kazuki, Kawashima, Shin, Kojima, Ryoichi, Hayakawa, Teruaki, Nabae, Yuta |
| Zdroj: |
JACS Au; 20210101, Issue: Preprints |
| Abstrakt: |
Nonplatinum metal (NPM) catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) have been developed; however, NPM catalysts still need to be improved in terms of both their catalytic activity and durability. To overcome these problems, an Fe active site contained within a more compact ligand than conventional, porphyrinic, 16-membered ring ligands, or more specifically, a hexaaza macrocyclic ligand with a 14-membered ring (14MR), was developed. In this study, the durability of the Fe-14MR complex was compared to that of Fe phthalocyanine (FePc), which has a 16-membered ring ligand, using in situ X-ray absorption spectroscopy; demetalation of the Fe complexes was directly observed during electrochemical experiments performed under acidic ORR conditions. It was found that Fe-14MR is significantly more resistant to demetalation than FePc during the ORR. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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