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Communication Dans Un Congrès Année : 2023

Tuning the catalytic activity of single atoms by interaction with nanoclusters for the oxygen reduction reaction

Javier Quílez-Bermejo
  • Fonction : Auteur
  • PersonId : 1183742
Vanessa Fierro
A. Celzard

Résumé

Fuel cells (FCs) are a promising option for efficient power generation in the future, their large-scale commercialization is currently hampered by their high cost. This is mainly due to the extensive use of platinum in these electrochemical systems, which is necessary to accelerate the unfavorable kinetics of the cathodic oxygen reduction reaction (ORR) [1–3]. As alternatives to platinum, two types of carbon-based catalysts have been suggested, namely, non-precious metal-based carbon catalysts and metal-free carbon catalysts. However, contradictory reports on their actual active sites and reduction mechanisms have been published [4]. Pyrolyzed metal-nitrogen-carbon (M-N-C) catalysts, particularly single-atom catalysts (SACs), have been extensively studied and have shown excellent electrocatalytic performance [5]. The combination of single-atom active sites with metal nanoclusters can further improve the catalytic activity [6]. The study presented in this work focuses on the preparation of nitrogen-doped and iron-doped carbon catalysts with precise control of the type of iron. The results showed that the iron-based catalysts exhibit outstanding catalytic activity and durability in alkaline medium for the ORR in the case of the nitrogen-doped carbon catalyst with iron single atoms and nanoclusters, even better than the commercial Pt (20 wt.%)/C catalyst used as reference. The analysis provided insight into the development of highly efficient multifunctional electrocatalysts, where the presence of iron nanoclusters was found to be a crucial determinant of the catalytic activity for the ORR.1.Debe, M. K. Electrocatalyst approaches and challenges for automotive fuel cells. Nature 486, 43–51 (2012).2.Sealy, C. The problem with platinum. Mater. Today 11, 65–68 (2008).3.Borghei, M., Lehtonen, J., Liu, L. & Rojas, O. J. Advanced Biomass-Derived Electrocatalysts for the Oxygen Reduction Reaction. Adv. Mater. 30, 1703691 (2018).4.Dessalle, A., Quílez-Bermejo, J., Fierro, V., Xu, F. & Celzard, A. Recent progress in the development of efficient biomass-based ORR electrocatalysts. Carbon 203, 237–260 (2023).5.Liu, K. et al. Insights into the activity of single-atom Fe-N-C catalysts for oxygen reduction reaction. Nat. Commun. 13, 2075 (2022).6.Wan, X. et al. Iron atom–cluster interactions increase activity and improve durability in Fe–N–C fuel cells. Nat. Commun. 13, 2963 (2022).

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Chimie
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Dates et versions

hal-04427876 , version 1 (31-01-2024)

Identifiants

  • HAL Id : hal-04427876 , version 1

Citer

Anthony Dessalle, Javier Quílez-Bermejo, Feina Xu, Vanessa Fierro, A. Celzard. Tuning the catalytic activity of single atoms by interaction with nanoclusters for the oxygen reduction reaction. 9th International Conference on Carbon for Energy Storage and Environmental Protection, Sep 2023, Budapest, Hungary. ⟨hal-04427876⟩
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