ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
0/0

Fourteen-Membered Macrocyclic Fe Complexes for Oxygen Reduction Catalysis Inspired by FeN4 Centers Hosted by Graphene

preprint
submitted on 12.03.2020 and posted on 12.03.2020 by Makoto Moriya, Ryo Takahama, Kazuki Kamoi, Junya Ohyama, Shin Kawashima, Ryoichi Kojima, Mariko Okada, Teruaki Hayakawa, Yuta Nabae
For the globalization of polymer electrolyte fuel cells, the development of non-precious-metal (NPM) catalysts for oxygen reduction is extremely important. To date, many NPM catalysts have been synthesized by pyrolyzing Fe-, N-, and C-containing precursors, but they suffer from the density and uncertain chemical structure of their active sites. This study reports a 14-membered macrocyclic Fe complex, which was inspired by FeN4 centers in the pyrolyzed catalysts, whereas typical macrocyclic MN4 complexes have 16-membered rings. This 14-membered macrocycle has strong Fe-N bonding with an average bond distance of 1.90 Å, which has been evidenced by single-crystal X-ray diffraction, and is markedly shorter than that in porphyrin, 2.0 Å. Promising electrocatalytic activities for oxygen reduction have been demonstrated in both of acidic and basic media.

Funding

NEDO

History

Email Address of Submitting Author

nabae.y.aa@m.titech.ac.jp

Institution

Tokyo Institute of Technology

Country

Japan

ORCID For Submitting Author

0000-0002-9845-382X

Declaration of Conflict of Interest

There is no conflict of interest.

Version Notes

Preprint_20200312

Exports

Logo branding

Exports