Morphological and chemical dynamics upon electrochemical cyclic sodiation of electrochromic tungsten oxide coatings extracted by in situ ellipsometry
| Autor: | Alexandre Zimmer, Clotilde Boulanger, Laurent Broch, Mickaël Gilliot, David Horwat, Nicolas Stein |
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| Přispěvatelé: | Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Ingéniérie et Science des Matériaux - EA 4695 (LISM), Université de Reims Champagne-Ardenne (URCA)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes (LCP-A2MC), Université de Lorraine (UL) |
| Rok vydání: | 2020 |
| Předmět: |
[PHYS]Physics [physics]
Materials science business.industry Scanning electron microscope Analytical chemistry Charge density 01 natural sciences Atomic and Molecular Physics and Optics Amorphous solid 010309 optics Optics Ellipsometry Electrochromism 0103 physical sciences Content (measure theory) Surface roughness Electrical and Electronic Engineering Cyclic voltammetry business Engineering (miscellaneous) |
| Zdroj: | Applied optics Applied optics, Optical Society of America, 2020, 59 (12), pp.3766-3772. ⟨10.1364/AO.389063⟩ |
| ISSN: | 1539-4522 0003-6935 |
| Popis: | The sodiation–desodiation process of sputtered amorphous electrochromic tungsten oxide coatings in an aqueous-based medium was simultaneously monitored over 99 cycles by cyclic voltammetry and in situ spectroscopic ellipsometry. This allowed extracting the evolution of optical and geometrical parameters upon cycling. The resulting electrochemical coloring-bleaching process was dynamically fitted in the 1.8–2.8 eV optical range with a four-phase model including a constrained spline parametrization of the dielectric function. This allows real time access to thickness, surface roughness, and dielectric function of N a x W O 3 . The temporal evolution of the latter in the fully colored state was used to highlight the porosity extent of the probed coating of opened morphology. The designed spectroelectrochemical approach was applied to map the temporal evolution of the N a content ( x in N a x W O 3 ) during and between cycles, taking into account the intricate interplay between charge density, thickness, and electrolyte uptake. |
| Databáze: | OpenAIRE |
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