Salle 5, Site Marcelin Berthelot
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Single atom catalysts (SAC) can offer appealing catalytic activity and selectivity for heterogeneous catalysis in general, [1] and for electrocatalysis for energy conversion devices in particular. [2] This presentation will describe some examples of studies on the aspects of synthesis, structural characterization and catalytic properties of Metal-Nitrogen-Carbon SACs for fuel cells, electrochemical H2O2 production and CO2 conversion. In many of these potential applications, Metal-Nitrogen-Carbon catalysts (with non-precious metal center) are however competing with precious metal-based catalysts, and the benefits of their lower cost must be balanced with their often lower activity and/or durability performances. Durability is especially a challenge, with the general tendency of M-N4 single metal atom sites to dynamically transform or to degrade as a result of exposure to highly oxidative or reductive conditions. [3-4] The presentation will discuss these broad aspects, fundamentally related to the nature of the M-Nx active sites and their achievable active site density.


[1] X. Yang, A. Wang, B. Qiao, J. Li, J. Liu, T. Zhang, « Single-atom catalysts: a new frontier in heterogeneous catalysis », Acc. Chem. Res, vol. 46, 2013, p. 1740-1748.

[2] Q. Zhang, J. Guan, « Single-atom catalysts for electrocatalytic applications », Adv Funct. Mater., vol. 30, n° 31, 2020.

[3] K. Kumar, L. Dubau, F. Jaouen, F. Maillard, « Review on the Degradation Mechanisms of Metal-N-C Catalysts for the Oxygen Reduction Reaction in Acid Electrolyte: Current Understanding and Mitigation Approaches », Chem. Rev., vol. 123, n° 15, 2023, p. 9265-9326.

[4] D. Karapinar, N. Tran Huan, N. Ranjbar Sahraie, J. Li, D. Wakerley, N. Touati, S. Zanna, D. Taverna, L. H. G. Tizei, A. Zitolo, F. Jaouen, M. Fontecave, « Electroreduction of CO2 on Single-Site Copper-Nitrogen-Doped Carbon Material: Selective Formation of Ethanol and Reversible Restructuration of the Metal Sites, Angew », Chemie Int. Ed., vol. 58, n° 42, 2019, p. 15098-15103.


Single iron atom sites on graphene