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Insertion of cations into WO3 investigated by QCM techniques

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Abstract

The electrochemical insertion of Li+, Na+, and hydrogen ions into thin layers of WO3 was investigated with the help of an electrochemical quartz crystal microbalance. Solutions of perchlorates in propylene carbonate were used as electrolytes, and the first cycle of coloration/discoloration cycles was studied. In both cases, insertion of cations was accompanied by a massive and partly irreversible uptake of the solvent in a molar ratio from 1:1 to 1:2 (ion vs solvent). The insertion of Na was observed for the first time. Molecules of water coinserted with H+ indicated that the inserted species is H3O+ rather than merely a proton H+. Very small but observable insertion of Mg2+ from perchlorate/PC solution proceeded in a marginal but observable extent from ClO4 -/PC solution.

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Acknowledgment

The investigations were supported by: Academy of Sciences, Research Plan AV/0Z4030502, Ministry of Education of Czech Republic, Project MSM002130516, Grant Agency of the Academy of Sciences, Grant No. B208130604, Ministry of Environment of Czech Republic, Grant No. VaV SN/3/171/05, Czech Science Foundation, Grant No. 104/06/1471.

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Correspondence to Jiří Vondrák.

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Vondrák, J., Sedlaříková, M., Velická, J. et al. Insertion of cations into WO3 investigated by QCM techniques. J Solid State Electrochem 11, 1459–1462 (2007). https://doi.org/10.1007/s10008-007-0329-x

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  • DOI: https://doi.org/10.1007/s10008-007-0329-x

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