Photo-electrochemical O2 Reduction to H2O2 Using a Co-Porphyrin Based Metal-Organic Framework

Raya Ifraemov; Shahar Binyamin; Yanai Pearlmutter; Itamar Liberman; Ran Shimoni; Idan Hod

doi:https://doi.org/10.1002/celc.202300422

Photo-electrochemical O₂ Reduction to H₂O₂ Using a Co-Porphyrin Based Metal-Organic Framework

Raya Ifraemov, Shahar Binyamin, Yanai Pearlmutter, Itamar Liberman, Ran Shimoni, Idan Hod

Department of Chemistry

Ben-Gurion University of the Negev

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

Abstract

Metal-Organic Frameworks (MOFs) hold great potential to be used as porous (photo)-electrocatalytic platforms containing large concentration of immobilized molecular catalysts. Indeed, the use of MOFs in a photo-electrochemical devices was recently demonstrated. However, so far there are no reports of MOFs used for photo-electrochemical O₂ reduction to H₂O₂. Herein, we utilize a Co-porphyrin based MOF (Co-MOF-525), that produces H₂O₂ at high faradaic efficiency (95 %), both electrochemically and photo-electrochemically. Electrochemical characterization show that the active catalytic site is a MOF-tethered Co(I)-porphyrin. Additionally, under light illumination, the MOF's intrinsic catalytic rate is significantly accelerated compared to dark electrolysis conditions. Thus, this work could open a path for future implementation of photoactive MOFs in solar fuel schemes.

Original language	American English
Article number	e202300422
Journal	ChemElectroChem
Volume	11
Issue number	3
DOIs	https://doi.org/10.1002/celc.202300422
State	Published - 1 Feb 2024

Keywords

heterogenous catalysis
hydrogen peroxide generation
metal-organic frameworks
oxygen reduction reaction
photo-electrochemical cells
rotating ring-disk electrode

All Science Journal Classification (ASJC) codes

Catalysis
Electrochemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

https://doi.org/10.1002/celc.202300422

Cite this

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title = "Photo-electrochemical O2 Reduction to H2O2 Using a Co-Porphyrin Based Metal-Organic Framework",

abstract = "Metal-Organic Frameworks (MOFs) hold great potential to be used as porous (photo)-electrocatalytic platforms containing large concentration of immobilized molecular catalysts. Indeed, the use of MOFs in a photo-electrochemical devices was recently demonstrated. However, so far there are no reports of MOFs used for photo-electrochemical O2 reduction to H2O2. Herein, we utilize a Co-porphyrin based MOF (Co-MOF-525), that produces H2O2 at high faradaic efficiency (95 %), both electrochemically and photo-electrochemically. Electrochemical characterization show that the active catalytic site is a MOF-tethered Co(I)-porphyrin. Additionally, under light illumination, the MOF's intrinsic catalytic rate is significantly accelerated compared to dark electrolysis conditions. Thus, this work could open a path for future implementation of photoactive MOFs in solar fuel schemes.",

keywords = "heterogenous catalysis, hydrogen peroxide generation, metal-organic frameworks, oxygen reduction reaction, photo-electrochemical cells, rotating ring-disk electrode",

author = "Raya Ifraemov and Shahar Binyamin and Yanai Pearlmutter and Itamar Liberman and Ran Shimoni and Idan Hod",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors. ChemElectroChem published by Wiley-VCH GmbH.",

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T1 - Photo-electrochemical O2 Reduction to H2O2 Using a Co-Porphyrin Based Metal-Organic Framework

AU - Ifraemov, Raya

AU - Binyamin, Shahar

AU - Pearlmutter, Yanai

AU - Liberman, Itamar

AU - Shimoni, Ran

AU - Hod, Idan

PY - 2024/2/1

Y1 - 2024/2/1

N2 - Metal-Organic Frameworks (MOFs) hold great potential to be used as porous (photo)-electrocatalytic platforms containing large concentration of immobilized molecular catalysts. Indeed, the use of MOFs in a photo-electrochemical devices was recently demonstrated. However, so far there are no reports of MOFs used for photo-electrochemical O2 reduction to H2O2. Herein, we utilize a Co-porphyrin based MOF (Co-MOF-525), that produces H2O2 at high faradaic efficiency (95 %), both electrochemically and photo-electrochemically. Electrochemical characterization show that the active catalytic site is a MOF-tethered Co(I)-porphyrin. Additionally, under light illumination, the MOF's intrinsic catalytic rate is significantly accelerated compared to dark electrolysis conditions. Thus, this work could open a path for future implementation of photoactive MOFs in solar fuel schemes.

AB - Metal-Organic Frameworks (MOFs) hold great potential to be used as porous (photo)-electrocatalytic platforms containing large concentration of immobilized molecular catalysts. Indeed, the use of MOFs in a photo-electrochemical devices was recently demonstrated. However, so far there are no reports of MOFs used for photo-electrochemical O2 reduction to H2O2. Herein, we utilize a Co-porphyrin based MOF (Co-MOF-525), that produces H2O2 at high faradaic efficiency (95 %), both electrochemically and photo-electrochemically. Electrochemical characterization show that the active catalytic site is a MOF-tethered Co(I)-porphyrin. Additionally, under light illumination, the MOF's intrinsic catalytic rate is significantly accelerated compared to dark electrolysis conditions. Thus, this work could open a path for future implementation of photoactive MOFs in solar fuel schemes.

KW - heterogenous catalysis

KW - hydrogen peroxide generation

KW - metal-organic frameworks

KW - oxygen reduction reaction

KW - photo-electrochemical cells

KW - rotating ring-disk electrode

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