Reactive oxygen species formation at Pt nanoparticles revisited by electron paramagnetic resonance and electrochemical analysis

Stephan den Hartog, Mohammad Samanipour, H. Y.Vincent Ching, Sabine Van Doorslaer, Tom Breugelmans, Annick Hubin, Jon Ustarroz

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Abstract

A combined electrochemical and electron paramagnetic resonance (EPR) procedure for the study of oxygen reduction reaction (ORR) intermediates generated at Pt nanoparticles (NPs) is validated in this work. Using spin-trap EPR complemented by electrochemical analysis, we show that we can detect and identify the free radicals that are produced during the ORR through trapping with 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) which are otherwise difficult to detect. Experiments with 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline-N-oxide (DEPMPO) as spin trap show no evidence of [rad]DEPMPO-OOH and indicate that only [rad]OH radicals are trapped during the ORR. The results of this study serve as a functional proof-of-concept for further research on the identification of radical ORR intermediates in solution. We propose that our procedure can be used for a more rigorous quantification of free radicals involved in other electrochemical reactions.

Original languageEnglish
Article number106878
Number of pages6
JournalElectrochemistry Communications
Volume122
DOIs
Publication statusPublished - Jan 2021

Keywords

  • Electron paramagnetic resonance (EPR)
  • Oxygen radicals
  • Oxygen reduction reaction (ORR)
  • Platinum nanoparticles
  • Reactive oxygen intermediates

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