Catégorie : Articles

Correlative Microscopy Insight on Electrodeposited Ultrathin Graphite Oxide Films, N. Ortiz Peña, D. Ihiawakrim, V. Ball, S. Stanescu, M. Rastei, C. Sanchez, D. Portehault, O. Ersen, Journal of Physical Chemistry Letters, DOI: 10.1021/acs.jpclett.0c02482

The team has issued two new articles in September and October dedicated to boron chemistry in nanomaterials!

One article published in Inorganic Chemistry is one of the core achievements of Simon Delacroix would received his doctoral title recently. We report nanoparticles of a lithium boride and provide the first in-depth solid-state nuclear magnetic resonance study, coupled to DFT calculations, in order to assign the ⁷Li and ¹¹B NMR signals in such alkali borides. Nice collaboration with the SMILES group within LCMCP lab.

Synthesis in Molten Salts and Characterization of Li₆B₁₈(Li₂O)_x Nanoparticles, S. Delacroix, Y. Le Godec, C. Coelho-diogo, C. Gervais, I. Génois, P. Le Griel, D. Portehault*, Inorganic Chemistry, DOI: 10.1021/acs.inorgchem.0c01694

A second article relates to a work performed through our long-term collaboration with the team of Dr. Weiwei Lei at Deakin University. We report boronnitride-based membranes as high performance heat conductors.

Nacre-bionic nanocomposite membrane for efficient in-plane dissipation heat harvest under high temperature, J. Wang, D. Liu, Q. Li, C. Chen, Z. Chen, M. Naebe, P. Song, D. Portehault, C. J. Garvey, D. Golberg, W. Lei, Journal of Materiomics, DOI: 10.1016/j.jmat.2020.08.006

The work of Francisco Gonell on the selective synthesis of nickel perovskites into molten salts is published in ACS Applied Nanomaterials! This work was performed jointly with the RMES group of the Lab. LCMCP and with our colleagues from the LISE lab.

Francisco has studied the mechanisms at stake in the formation of perovskite oxides in molten salts in order to drive reaction pathways towards selected crystal structures. We have then shown that we could use these controlled syntheses to tune the electrocatalytic properties of the materials for the reduction of dioxygen.

Experimental Descriptors for the Synthesis of Multicationic Nickel Perovskite Nanoparticles for Oxygen Reduction, F. Gonell, C. M. Sanchez Sanchez, V. Vivier, C. Laberty-Robert, D. Portehault*, ACS Applied Nanomaterials, DOI: 10.1021/acsanm.0c01094

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.

Our new work with UCMadrid and José M. González-Calbet’s group is out in Chemistry of Materials! Another example of this fruitful collaboration for the design of functional nanoscaled oxides, this time  in aqueous media. Congrats to Alberto and Francisco for their really nice work.

A. Azor, M. L. Ruiz-González, F. Gonell, C. Laberty-Robert, M. Parras, C.Sanchez, D.Portehault,* and J. M. González-Calbet*, Nickel-doped sodium cobaltite 2D nanomaterials: synthesis and electrocatalytic properties, High pressures pathway toward boron-based nanostructured solids, DOI: 10.1021/acs.chemmater.8b01146