Auteur/autrice : david

The nice work of Ram Kumar has been accepted for publication in Nanoscale! In this paper, we tune molten salts synthesis pathways in order design nanoparticles of nickel silicides. We show that these nanoparticles undergo surface transformation upon exposure to water and oxidative electrochemical potential, so that a thin layer of nickel oxyhydroxide forms at their surface. This layer is an active electrocatalyst for water oxidation, while the silicide particles core remains intact and provides fast charge transfer. The material shows surprising long term stability under operation of water oxidation. A nice collaboration with the RMES team of LCMCP, the LRS lab at Sorbonne University, and University of Strasbourg.

Phase selective synthesis of nickel silicide nanocrystals in molten salts for electrocatalysis of the oxygen evolution reaction, R. Kumar, M. Bahri, Y. Song, F. Gonell, C. Thomas, O. Ersen, C. Sanchez, C. Laberty-Robert, D. Portehault*, Nanoscale, DOI: 10.1039/D0NR04284F

The work of Francisco Gonell has just been accepted for publication in Chemistry of Materials. In this paper, we tune syntheses in molten salts to control the formation of nanoparticles of 3D and bi-dimensional manganese perovskite oxides. We highlight the very high activity and stability of these nanomaterials for the electrocatalysis of the oxygen reduction reaction. Fruitful Sorbonne Université collaboration with Christel Laberty-Robert from the RMES group of LCMCP, with the LRS lab and the LISE lab (Vincent Vivier, Carlos Sanchez Sanchez).

Structure-activity relationship in manganese perovskite oxide nanocrystals from molten salts for efficient oxygen reduction reaction electrocatalysis, Chemistry of Materials, DOI: 10.1021/acs.chemmater.0c00681

Unambiguous localization of titanium and iron cations in doped manganese hollandite nanowires

It’s out: deciphering structure and nanoscale evolutions of electrocatalysts by in situ electrochemical transmission electron microscopy. Nice collaboration with O. Ersen – IPCMS Strasbourg – and B. Lassalle – synchrotron SOLEIL. Just appeared in ACS Nano.

New paper out in Chem. Eur. J.: we have combined hard templating and the differential reactivity of TiO₂ polymorphs to design mixed valence Ti³⁺/Ti⁴⁺ oxide nanoparticles with carbon-free surfaces. The approach enabled us to probe the surface states of the particles with synchrotron radiation.

We have discovered a new WO3 polymorph as a a 2D nanomaterial, through aqueous chemistry at low temperature. This material shows mpressive electrochromic properties. Congrats to Julie and Binghua for their great work, and thanks to collaborators from SOLVAY, INSP Paris, IPCM Paris, IRCP Paris, UC Madrid and UCCS Lille for bringing their own bricks to this nice assembly. Check the paper and the story of the discovery there and on the CNRS web site.