Intricacies of Mass Transport during Electrocatalysis: A Journey through Iron Porphyrin-Catalyzed Oxygen Reduction.

J Am Chem Soc

Department of Spectroscopy and Catalysis, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.

Published: June 2024

AI Article Synopsis

  • Electrochemical methods are gaining popularity in green chemistry due to their potential for sustainability.
  • Understanding reactions at the electrode-solution interface is key, and the study uses a combination of techniques, including voltammetry and mass spectrometry, for real-time monitoring.
  • The research reveals important insights into the electrocatalytic processes involved in the reduction of oxygen, showing reaction intermediates and degradation pathways, which could improve optimization in sustainable electrochemical reactions.

Article Abstract

Electrochemical steps are increasingly attractive for green chemistry. Understanding reactions at the electrode-solution interface, governed by kinetics and mass transport, is crucial. Traditional insights into these mechanisms are limited, but our study bridges this gap through an integrated approach combining voltammetry, electrochemical impedance spectroscopy, and electrospray ionization mass spectrometry. This technique offers real-time monitoring of the chemical processes at the electrode-solution interface, tracking changes in intermediates and products during reactions. Applied to the electrochemical reduction of oxygen catalyzed by the iron(II) tetraphenyl porphyrin complex, it successfully reveals various reaction intermediates and degradation pathways under different kinetic regimes. Our findings illuminate complex electrocatalytic processes and propose new ways for studying reactions in alternating current and voltage-pulse electrosynthesis. This advancement enhances our capacity to optimize electrochemical reactions for more sustainable chemical processes.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11157527PMC
http://dx.doi.org/10.1021/jacs.4c04989DOI Listing

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