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Title
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Reactive oxygen species formation at Pt nanoparticles revisited by electron paramagnetic resonance and electrochemical analysis
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Author
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Abstract
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| 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 radical dotDEPMPO-OOH and indicate that only radical dotOH 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. |
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Language
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English
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Source (journal)
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Electrochemistry communications. - Amsterdam
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Publication
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Amsterdam
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2021
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ISSN
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1388-2481
1873-1902
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DOI
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10.1016/J.ELECOM.2020.106878
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Volume/pages
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122
(2021)
, 6 p.
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Article Reference
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106878
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ISI
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000620267900013
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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