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Juin 2019
  04 juin 2019, 14h00, Amphithéâtre, Séminaire d'équipe, Jonathan VEINOT (University of Alberta, Edmonton, Canada), Who would have though Group 14 nanomaterials could be so complicated (and useful)?,
  06 juin 2019, 14h00, Amphithéâtre, Séminaire-invité, Elise CONTRAIRES (Ecole Centrale de Lyon), Mouillage dynamique dans des interfaces complexes,
  13 juin 2019, 16h15, Amphithéâtre, Conférence du-jeudi, Damien VOIRY (IEM), Exfoliated 2D materials for electrocatalysis and molecular sieving,
Two-dimensional (2D) materials such as graphene and Transition Metal Dichalcogenides (TMDs) are fascinating objects impacting broad domains in chemistry and physics.1 2D materials have also emerged as electrocatalysts demonstrating excellent activity for key electrochemical processes including the hydrogen evolution reaction (HER), the oxygen evolution reaction (OER) and the CO2 reduction reaction (CO2RR).2 The properties of TMDs can be tuned by changing the elemental composition, the thickness and the atomic structure1. TMDs can indeed adopt two different coordinations for the metal atoms: either a trigonal prismatic coordination or an octahedral coordination that corresponds to 2H and 1T phases respectively3. Nanolaminate membranes made of exfoliated nanosheets such as graphene oxide (GO) are also promising candidates for molecular sieving via size-limited diffusion in the 2D capillaries of nanolaminate membranes4. Our research aims to investigate the behavior of 2D materials for novel electrochemical reactions and as building-blocks of nanolaminate membranes. We have notably explored the role of the structural phase and the defects on the HER performance from group-6 TMDs in order to optimize the thermodynamics and the kinetics of the catalytic reaction. Controlling the surface chemistry of the 2D nanosheets can provide additional levers for enhancing the sieving performance of the nanolaminate membranes. Through several examples, I will present our recent strategies for engineering exfoliated nanosheets of TMDs. My presentation will highlight how these strategies can be used for fine tuning the properties of the 2D TMDs and other 2D materials for molecular sieving and electrocatalysis. References: 1. Wang, Q. H., Kalantar-Zadeh, K., Kis, A., Coleman, J. N. & Strano, M. S. Electronics and optoelectronics of two-dimensional transition metal dichalcogenides. Nat. Nanotechnol. 7, 699–712 (2012). 2. Voiry, D., Shin, H. S., Loh, K. P. & Chhowalla, M. Low-dimensional catalysts for hydrogen evolution and CO2 reduction. Nat. Rev. Chem. 2, 0105 (2018). 3. Voiry, D., Mohite, A. & Chhowalla, M. Phase engineering of transition metal dichalcogenides. Chem. Soc. Rev. 44, 2702–2712 (2015). 4. Joshi, R. K. et al. Precise and Ultrafast Molecular Sieving Through Graphene Oxide Membranes. Science 343, 752–754 (2014).
Retour.
  25 juin 2019, 14h00, Amphithéâtre, Séminaire-invité, Seraphine Wegners, TBA,
Juillet 2019
  04 juillet 2019, 16h15, Amphithéâtre, Conférence du-jeudi, Benoit ROMAN (ESPCI, Paris), La frustrante géométrie des déchirures,

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