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Updated: Jun 18, 2026
![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
Published on: December 4, 2017
Electronic modulation of iron phthalocyanine molecular catalysts via cyano-substitution for oxygen reduction reaction
Kosuke Ishibashi1, Yutaro Hirai2,3, Noriko Haiya4
1Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1, Katahira, Aoba-Ku, Sendai 980-8577, Japan. hiroshi.yabu.d5@tohoku.ac.jp.
Abstract:
High-performance oxygen reduction reaction (ORR) catalysts are crucial as cathode catalysts for fuel cells and metal-air batteries. We have previously reported that iron azaphthalocyanine molecularly supported on Ketjenblack exhibits higher ORR activity than both iron phthalocyanine and Pt/C, while being free of precious metals. This enhancement is attributed to the modulation of the electronic state at the active center through the introduction of electron-withdrawing groups into the peripheral positions. In this study, we theoretically and experimentally investigate how the introduction of more strongly electron-withdrawing cyano groups influences ORR activity. Furthermore, we discuss the relationship between the ionization potential and the catalytic activity.
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