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2019-12-02 - Colloque/Présentation - communication orale - Anglais - page(s)

Liang Hui, Li W.J., Panepinto Adriano , Chen M, Snyders Rony , Thiry Damien , "Synthesis of an air-stable polymer/Mg nanocomposite materials combining plasma based method: application for hydrogen storage" in 2019 MRS Fall Meeting, Boston, Etats-Unis

  • Codes CREF : Chimie des surfaces et des interfaces (DI1327)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)

Abstract(s) :

(Anglais) Hydrogen is considered as a promising alternative energy carrier due to its high energy density, great variety of potential sources, light weight and low environmental impact. Though the storage of hydrogen via Mg-based nanomaterials is very promising, the high reactivity of Mg towards oxygen leads to the easy formation of MgO, which blocks the penetration of hydrogen in the material, limiting the performance of the device. In this work, in order to overcome this limitation, we propose to synthesize bilayer nanostructured Mg/polymer thin films using cold plasma-based processes. The process consists of two steps: (i) the synthesis of Mg nanostructured films by magnetron sputtering at grazing incidence and (ii) the coverage of the metallic nanostructured film by plasma polymerization from ethylene precursor. This method should allow (i) to control the porosity of Mg films by simply modifying depositions parameters such as temperature, incidence angle of the depositing particles (α) or pressure, and (ii) to avoid oxidation of the Mg-based nano-objects by protecting them with a highly cross-linked plasma polymer. SEM characterization of the samples has revealed the presence of isolated Mg-based nanocolumns. Both the intercolumnar space (i.e. from 20 to 100 nm) and the diameter of the nano-objects (i.e. from 100 to 300 nm) depend on the incidence angle of the depositing particles. This evolution is directly related to the competition between surface diffusion and shadowing effect as confirmed by kinetic Monte Carlo methods. Mg-based nanostructures were homogeneously covered by a carbon/hydrogen-based plasma polymer which protects the films against oxidation. The obtained material has a high potential for efficient hydrogen storage.