Nanostructured Fe-N-C pyrolyzed catalyst for the H2O2 electrochemical sensing

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dc.contributor.authorCandia-Onfray, Christian
dc.contributor.authorBollo, Soledad
dc.contributor.authorYanez, Claudia
dc.contributor.authorEscalona, Nestor
dc.contributor.authorMarco, Jose F.
dc.contributor.authorMenendez, Nieves
dc.contributor.authorSalazar, Ricardo
dc.contributor.authorRecio, F. Javier
dc.date.accessioned2025-01-20T23:50:48Z
dc.date.available2025-01-20T23:50:48Z
dc.date.issued2021
dc.description.abstractFe-N-C pyrolyzed materials have been proposed as substitutes of the noble-based catalyst for energy conversion reactions. However, their use as electrochemical sensors has not been deeply explored. In the present work, different Fe-N-C pyrolyzed catalysts were synthesized for the amperometric sensing of the H2O2 reduction in neutral media. The catalysts were characterized by BET, TEM, FESEM, XPS, Mossbauer spectroscopy, and cyclic voltammetry. The catalysts present an N-doped graphitic matrix with a macroporous structure and mesoporous contribution. Different amounts of N-pyridinic, N-pyrrolic, N-graphitic, N-oxides, and FeN4 sites have been detected on the catalysts. Among the different active sites present in the catalysts, the FeN4 structure is proposed as the most catalytic active site for the hydrogen peroxide reduction reaction (HPRR). Under optimal conditions (0.61 V vs. NHE, 0.00 V vs. Ag/AgCl), the materials show a lineal amperometric response in the range of 0.08 and 14 mu M, with a sensitivity of 31.3 mu A mu M-1 cm(-2), and a detection and quantification limits of 0.25 mu M and 0.75 mu M respectively. The amperometric results indicate that the best performance is reached when increasing the amount of FeN4 active sites, and the redox potential of the FeN4 species becomes more positive. The Fe-N-C catalyst stands out for the more positive working potential than other materials proposed in the literature. (C) 2021 Elsevier Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.electacta.2021.138468
dc.identifier.eissn1873-3859
dc.identifier.issn0013-4686
dc.identifier.urihttps://doi.org/10.1016/j.electacta.2021.138468
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94740
dc.identifier.wosidWOS:000658236500007
dc.language.isoen
dc.revistaElectrochimica acta
dc.rightsacceso restringido
dc.subjectPyrolyzed catalyst
dc.subjectHydrogen peroxide reduction
dc.subjectElectrochemical sensor, Reactivity descriptors
dc.subject.ods07 Affordable and Clean Energy
dc.subject.odspa07 Energía asequible y no contaminante
dc.titleNanostructured Fe-N-C pyrolyzed catalyst for the H2O2 electrochemical sensing
dc.typeartículo
dc.volumen387
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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