Electrochemical CO2 reduction by a cobalt bipyricorrole complex: decrease of an overpotential value derived from monoanionic ligand character of the porphyrinoid species

Ayumu Ogawa; Koji Oohora; Wenting Gu; Takashi Hayashi

doi:10.1039/C8CC08876D

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Electrochemical CO₂ reduction by a cobalt bipyricorrole complex: decrease of an overpotential value derived from monoanionic ligand character of the porphyrinoid species†

Ayumu Ogawa,^a Koji Oohora,

*^ab Wenting Gu^a and Takashi Hayashi

*^a

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* Corresponding authors

^a Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Japan
E-mail: oohora@chem.eng.osaka-u.ac.jp, thayashi@chem.eng.osaka-u.ac.jp

^b PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi 332-0012, Japan

Abstract

A newly synthesized Co(II) complex with a monoanionic bipyricorrole ligand is found to catalytically promote a selective CO₂ electroreduction to CO with Faradaic efficiency of 75%. Catalytic Tafel plots show that the overpotential of Co(II) bipyricorrole is 0.35 V lower than that of a Co(II) complex with the dianionic tetraphenylporphyrin ligand.

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Article information

DOI: https://doi.org/10.1039/C8CC08876D
Article type: Communication
Submitted: 07 Nov 2018
Accepted: 07 Dec 2018
First published: 07 Dec 2018

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Chem. Commun., 2019,55, 493-496

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Electrochemical CO₂ reduction by a cobalt bipyricorrole complex: decrease of an overpotential value derived from monoanionic ligand character of the porphyrinoid species

A. Ogawa, K. Oohora, W. Gu and T. Hayashi, Chem. Commun., 2019, 55, 493 DOI: 10.1039/C8CC08876D

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