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DOE OSTI · 2574941

Quantification of Reactive Oxygen Species Produced from Electrocatalytic Materials

Messias, Igor [Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)]·Kupferberg, Jacob [Argonne National Laboratory (ANL), Argonne, IL (United States)]·Bielinski, Ashley R. [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000307735782)·Nagao, Raphael [Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)] (ORCID:0000000184009093)·Martinson, Alex B. F. [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000339161672)·Lopes, Pietro Papa [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:000000033211470X)
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Abstract

Oxygen electrochemistry goes beyond O 2 , as the formation of reactive oxygen species (ROS) such as H 2 O 2 and O 3 during water oxidation is key in the destruction of persistent pollutants in water remediation technologies as well as in the degradation of fuel cell and electrolyzer components. In this study, we developed an in situ method utilizing the rotating ring-disk electrode technique to quantify the formation of O 2 , O 3 , and H 2 O 2 species across a broad pH range (1–8.3). Oxygen selectivity trends over Pt, IrO 2 , and PbO 2 surfaces reveal that even O 2 evolution catalysts may produce small yet measurable amounts of ROS, further modulated by pH and electrode potential. In conclusion, these findings emphasize the need to probe the selectivity of oxygen electrochemistry for a more complete picture of advanced materials for electrochemical technologies.

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRYElectrodesElectrolytesFree radicalsPlatinumSelectivityhydrogen peroxideiridiumoxygen evolution reactionozonereactive oxygen species

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Messias, Igor [Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)], Kupferberg, Jacob [Argonne National Laboratory (ANL), Argonne, IL (United States)], Bielinski, Ashley R. [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000307735782), Nagao, Raphael [Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)] (ORCID:0000000184009093), Martinson, Alex B. F. [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000339161672), Lopes, Pietro Papa [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:000000033211470X). 2025-01-30. Quantification of Reactive Oxygen Species Produced from Electrocatalytic Materials. https://doi.org/10.1021/acscatal.4c06271

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