Fe3O4 Templated Pyrolyzed Fe N C Catalysts. Understanding the role of N-Functions and Fe3C on the ORR Activity and Mechanis
Entity
UAM. Departamento de Química Física AplicadaPublisher
WileyDate
2022-03-01Citation
10.1002/celc.202200115
ChemElectroChem 9.11 (2022): e202200115
ISSN
2196-0216 (online)DOI
10.1002/celc.202200115Funded by
knowledgements This work was supported by Fondecyt Regular Project 1161117, Conicyt Scholarship 21160212, Fondecyt Postdoctoral Projects 3180509 and 3170330, and Anillo Project ACT-192175. By MICIN grant PGC2018-095642-B-I00, MCIN/AEI/10.13039/501100011033 RTI2018-095303-B-C51, by ERDF A way to making Europe, and by CISC grant 2021AEP056. The authors acknowledge Jonathan Urra for its technical support in the electroProject
Gobierno de España. PGC2018-095642-B-I00; Gobierno de España. MCIN/AEI/10.13039/501100011033; Gobierno de España. RTI2018-095303-B-C51Editor's Version
https://doi.org/10.1002/celc.202200115Subjects
DFT; Iron Carbides Mechanism; Oxygen Reduction Reaction; Pyrolyzed Electrocatalysts; Física; QuímicaRights
© 2022 The AuthorsAbstract
Pyrolyzed non-precious metal catalysts have been proposed as an alternative to substitute the expensive and scarce noble metal catalysts in several conversion energy reactions. For the oxygen reduction reaction (ORR), the pyrolyzed catalyst M−N−C (M: Fe or Co) presents remarkable catalytic activity in acid and alkaline media. These pyrolyzed materials show a high heterogeneity of active sites being the most active in the MNx moieties. The activity and stability of these catalysts are also conditioned by other structural parameters such as the area, the N-doping, and by the presence of metal particles. In this study, we explore the use of Fe3O4 nanoparticles as templates and as iron sources to synthesize Fe−N−C. The best performance for the ORR in acidic media was reached with the catalysts using nanoparticles covered by PANI and iron salts as the precursor, with an onset potential of 0.85 vs. RHE and a direct 4-electrons mechanism. We corroborated the use of the catalysts’ redox potential as reactivity descriptors and discussed the detrimental role of the presence of Fe3C metallic particles in the mechanism. Based on the experimental results, we performed DFT calculations to explore the influence of N-doped species on the electronic density of the iron centers of FeN4 active sites, and we propose a theoretical model for increasing the activity based on the distance and ratio of N-doping to iron center
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Google Scholar:Venegas, Ricardo
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Zúñiga, César
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Zagal, José H.
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Toro Labbé, Alejandro
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Marco, José F.
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Menéndez González, Nieves
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Muñoz Becerra, Karina
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Recio, Francisco J.
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