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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Article numbere202300422
JournalChemElectroChem
Volume11
Issue number3
DOIs
StatePublished - 1 Feb 2024

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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