Relationship between synthesis, microstructure and electrochemical properties of double-layered hydroxides (HDL)
type: Dataset
description: This work is devoted to the synthesis of NiAl-CO32- Layered Double Hydroxide phases (LDH) with controlled morphology and to the study of the relationship between the structural / microstructural and electrochemical properties. The LDH phases are prepared by a new synthetic method, based on the hydrothermal synthesis in presence of amino acids. We have highlighted the influence of various synthetic parameters such as the amount of amino acid, the concentration of metal salts, the pH of the medium, the temperature and time of hydrothermal treatment as well as the amino acid nature. Three phases of different degrees of crystallinity and different morphologies, representative of synthesized samples were particularly studied. Their structures and microstructures were determined by Rietveld refinement using high-resolution synchrotron powder X-ray diffraction (XRD) data. These XRD results combined with transmission electron microscopy (TEM) observations indicate that the broadening of 00l diffraction lines is mainly due to size effects, while both size and micro-strain effects contribute to the anisotropic broadening of the other hkl reflections. The micro-strain are attributed to an interstratification phenomena (CO32-/SO42-) and intergrowth between rhombohedral 3R1 and hexagonal 2H1 polytypes, confirmed and quantified using the software DIFFaX. The electrochemical properties of these phases are also studied by cyclic voltammetry showing that the presence of the 2H1 stacking motifs results in a net increase of the electrochemical signal.
identifier: NNT: 2012CLF22292
issued: 2026-05-11T03:57:01.941469
language: fr
modified: 2026-05-11T03:57:01.941474
contact point: Organization
  fn: CCSD
keyword: acide-amine
keyword: amino-acid
keyword: chimothechemical-sciencesother
keyword: cyclic-voltametry
keyword: diffax
keyword: electrochemical-properties
keyword: hydroxydes-doubles-lamellaires
keyword: infoeu-reposemanticsdoctoralthesis
keyword: interstratification
keyword: layered-double-hydroxides
keyword: methode-rietveld
keyword: polytype
keyword: proprietes-electrochimiques
keyword: rietveld-method
keyword: structure-microstructure
keyword: theses
keyword: voltametrie-cyclique
landing page: https://theses.hal.science/tel-00822128

Relationship between synthesis, microstructure and electrochemical properties of double-layered hydroxides (HDL)
type: Distribution
format: HTML
issued: 2026-05-11T03:57:01.947088
modified: 2026-05-11T03:57:01.923284
access URL: https://theses.hal.science/tel-00822128

test_moissonnage_selune
type: Agent