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Title
Japanese:High Durability of a 14-Membered Hexaaza Macrocyclic Fe Complex for an Acidic Oxygen Reduction Reaction Revealed by In Situ XAS Analysis 
English:High Durability of a 14-Membered Hexaaza Macrocyclic Fe Complex for an Acidic Oxygen Reduction Reaction Revealed by In Situ XAS Analysis 
Author
Japanese: Junya Ohyama, Makoto Moriya, Ryo Takahama, Kazuki Kamoi, Shin Kawashima, Ryoichi Kojima, Teruaki Hayakawa, Yuta Nabae.  
English: Junya Ohyama, Makoto Moriya, Ryo Takahama, Kazuki Kamoi, Shin Kawashima, Ryoichi Kojima, Teruaki Hayakawa, Yuta Nabae.  
Language English 
Journal/Book name
Japanese:JACS Au 
English:JACS Au 
Volume, Number, Page Vol. 1    No. 10    pp. 1798-1804
Published date Sept. 2021 
Publisher
Japanese:American Chemical Society 
English:American Chemical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.1021/jacsau.1c00309
 
DOI https://doi.org/10.1021/jacsau.1c00309
Abstract 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.

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