Metallocorroles as Non-Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

Naomi Levy; Atif Mahammed; Ariel Friedman; Bar Gavriel; Zeev Gross; Lior Elbaz

doi:10.1002/cctc.201600556

Metallocorroles as Non-Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

Naomi Levy, Atif Mahammed, Ariel Friedman, Bar Gavriel, Zeev Gross, Lior Elbaz

Technion-Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

A series of non-precious metal complexes, composed of five first-row transition-metal complexes with β-pyrrole-brominated 5,10,15-tris(pentafluorophenyl)corroles [M(tpfcBr₈), M=Mn, Fe, Co, Ni, and Cu], was investigated as catalysts for oxygen reduction in an alkaline solution (0.1 m KOH). The corroles were adsorbed on a high surface area carbon powder (BP2000) prior to electrochemical measurements to create a unique composite material. The comparison between the different metal complexes revealed a high oxygen reduction reaction (ORR) catalytic performance in the case of the Fe- and Co-corroles. These complexes reduce oxygen at very low overpotentials (with E_1/2=0.79 V and 0.77 V vs. RHE, respectively), which is better than other well-defined molecular catalysts and comparable to that of Pt on carbon (XC-72). The mechanism by which the most active complexes catalyze the ORR in alkaline solutions was also studied, disclosing that the dominant reaction path is a four-electron reduction of molecular oxygen to hydroxide.

Original language	English
Pages (from-to)	2832-2837
Number of pages	6
Journal	ChemCatChem
Volume	8
Issue number	17
DOIs	https://doi.org/10.1002/cctc.201600556
State	Published - 7 Sep 2016

Bibliographical note

Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Funding

The authors would like to thank the Israeli Ministry of Energy for partially funding this project (grant no. 024-11-215). A.F. would like to thank the Israeli Ministries of Energy and Science for his scholarship. L.E. would also like to thank the Israel Science Foundation and Israel Prime Minister's Office fuel alternatives initiative for partial funding of this work under the Israel Research Center for Electrochemical Propulsion (INREP) (grant no. ISF 2797/11).

Funders	Funder number
Israel Prime Minister's Office fuel alternatives
Israeli Ministries of Energy and Science
Israel Science Foundation
Israel National Research Center for Electrochemical Propulsion	ISF 2797/11
Ministry of Energy, Israel	024-11-215

Keywords

electrocatalysis
metallocorroles
non-precious metal catalysts
oxygen reduction

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10.1002/cctc.201600556

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abstract = "A series of non-precious metal complexes, composed of five first-row transition-metal complexes with β-pyrrole-brominated 5,10,15-tris(pentafluorophenyl)corroles [M(tpfcBr8), M=Mn, Fe, Co, Ni, and Cu], was investigated as catalysts for oxygen reduction in an alkaline solution (0.1 m KOH). The corroles were adsorbed on a high surface area carbon powder (BP2000) prior to electrochemical measurements to create a unique composite material. The comparison between the different metal complexes revealed a high oxygen reduction reaction (ORR) catalytic performance in the case of the Fe- and Co-corroles. These complexes reduce oxygen at very low overpotentials (with E1/2=0.79 V and 0.77 V vs. RHE, respectively), which is better than other well-defined molecular catalysts and comparable to that of Pt on carbon (XC-72). The mechanism by which the most active complexes catalyze the ORR in alkaline solutions was also studied, disclosing that the dominant reaction path is a four-electron reduction of molecular oxygen to hydroxide.",

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AU - Gross, Zeev

AU - Elbaz, Lior

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Metallocorroles as Non-Precious Metal Electrocatalysts for Highly Efficient Oxygen Reduction in Alkaline Media

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