Ion intercalation dynamics of electrosynthesized mesoporous WO3 thin films studied by multi-scale coupled electrogravimetric methods
| Autor: | Fatemeh Razzaghi, Françoise Pillier, Catherine Debiemme-Chouvy, Hubert Perrot, Ozlem Sel |
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| Přispěvatelé: | Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Inorganic chemistry Analytical chemistry General Physics and Astronomy Ionic bonding ion transfer dynamics 2 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Ion Li intercalation/extraction WO3 mesoporosity Physical and Theoretical Chemistry Thin film surfactant-assisted electrodeposition Quartz crystal microbalance 021001 nanoscience & nanotechnology EQCM 0104 chemical sciences Dielectric spectroscopy Electrochromism ac-electrogravimetry 0210 nano-technology Mesoporous material [CHIM.OTHE]Chemical Sciences/Other |
| Zdroj: | Physical Chemistry Chemical Physics Physical Chemistry Chemical Physics, 2015, 17 (22), pp.14773-14787. ⟨10.1039/c5cp00336a⟩ Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2015, 17 (22), pp.14773-14787. ⟨10.1039/c5cp00336a⟩ |
| ISSN: | 1463-9076 1463-9084 |
| DOI: | 10.1039/c5cp00336a⟩ |
| Popis: | International audience; Mesoporous WO3 thin films were prepared electrochemically by using an ionic surfactant during the synthesis, and the electrochemical properties are investigated in comparison with their dense analogues. This report specifically highlights the suitability of a time resolved coupled electrogravimetric method to follow meticulously the ion intercalation/extraction phenomena which revealed the enhanced ion intercalation/extraction behavior of electrodeposited mesoporous WO3 thin films for diverse applications in energy storage and electrochromism. This methodology (electrochemical impedance spectroscopy (EIS) and its coupling with a fast quartz crystal microbalance (QCM)) has the ability to detect the contribution of the charged or uncharged species during the electrochemical processes, and to deconvolute the global EQCM responses into the anionic, cationic, and the free solvent contributions. Our study identifies the involvement of several charged species (Li(+), Li(+)·H2O) in the compensation of charge, and H2O molecules indirectly contribute to the process in both dense and mesoporous WO3 thin films. Even a slight contribution of ClO4(-) ions was detected in the case of mesoporous analogues. The results of the study indicate that the transfer resistances of Li(+) and Li(+)·H2O are decreased when the WO3 films are mesoporous. A more significant difference is observed for the larger and partially dehydrated Li(+)·H2O ions, suggesting that increased surface area and pore volume created by mesoporous morphology facilitate the transfer of larger charged species. The relative concentration changes of cations are also magnified in the mesoporous films. The final concentration variations are higher in mesoporous films than that in the dense analogues; ∼4 times and ∼10 times higher for Li(+) and for Li(+)·H2O, respectively. To the best of our knowledge, an unambiguous identification of species other than desolvated cations (e.g. Li(+) ions), the information on their transfer dynamics and quantification of the transferred species have never been reported in the literature to describe the charge compensation process in WO3 based electrodes. |
| Databáze: | OpenAIRE |
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