Jump diffusion coefficient of different cations intercalated into amorphous WO3 |
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| Institution: | 1. Departament de Ciències Experimentals, Universitat Jaume I, E-12071 Castelló, Spain;2. FEMAN, Departament de Física Aplicada i Òptica, Universitat de Barcelona, E-08080 Barcelona, Spain;1. Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Section 4, Keelung Road, Taipei 106, Taiwan;2. Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung 81148, Taiwan;3. Department of Chemical and Materials Engineering, Tamkang University, New Taipei 25137, Taiwan;4. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan;1. Department of Chemical Engineering, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;2. Department of Bioengineering, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;3. College of Computer and Information Science, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;4. Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;2. ENEA UTTMAT-IRR, Via Anguillarese 301, 00123 Rome, Italy;1. Laboratoire Science des Procédés Céramiques et de Traitements de Surface, UMR 7315 CNRS – Université de Limoges, Centre Européen de la Céramique, 12, rue Atlantis, 87068 Limoges Cedex, France;2. Institut XLIM, UMR 7252 CNRS – Université de Limoges, 123, Avenue Albert Thomas, 87060 Limoges Cedex, France;3. Field of Advanced Energy Conversion, Department of Frontier Materials, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan |
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| Abstract: | This work shows how the combination of quasi-equilibrium (chronopotentiometry) and kinetical measurements (electrochemical impedance) is able to extract ionic mobility values like the jump diffusion coefficient DJ. Results are presented on the jump diffusion coefficient variation with composition of several cations (Li+, Na+, and K+) intercalated into electron beam evaporation-prepared a-WO3 thin films. DJ exhibits higher values for the smallest ion (Li+), and decreases as the ion size enlarges. In all cases DJ shows lower values for high intercalation levels. It is noted that the type of cation rather influences transport mechanisms than equilibrium properties (insertion thermodynamics). The energy barrier of ion hopping is analyzed in light of available microscopic diffusion models and theoretical simulations. |
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