Insertion of cations into WO3 investigated by QCM techniques

0085055 - ÚACH 2008 RIV DE eng J - Journal Article
Vondrák, Jiří - Sedlaříková, M. - Velická, Jana - Špičák, P. - Svoboda, V. - Kazelle, J.
Insertion of cations into WO3 investigated by QCM techniques.
[Inserce kationtů do WO3 studovaná technikou QCM.]
Journal of Solid State Electrochemistry. Roč. 11, č. 10 (2007), s. 1459-1462. ISSN 1432-8488. E-ISSN 1433-0768
R&D Projects: GA MŽP SN/3/171/05; GA AV ČR(CZ) KJB208130604; GA ČR(CZ) GA104/06/1471
Institutional research plan: CEZ:AV0Z40320502
Keywords : tungsten trioxide * insertion of cations * quartz crystal microbalance
Subject RIV: CG - Electrochemistry
Impact factor: 1.535, year: 2007

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.

Pomocí elektrochemické krystalové mikrováhy QCM byla studována inserce iontů H+, Li+ a Na+ do tenkých vrstev WO3. Inserce alkalických iontů z roztoků chloristanů v propylenkarbonátu je provázena rozsáhlou současnou insercí rozpouštědla v molárním poměru 1:1 až 1:2. Tato inserce byla jen zčásti reverzibilní. Inserce Na byla takto pozorována ponejprv. Pozorovali jsme rovněž inserci hořčíku, i když v malé míře. Inserce vodíku do WO3 probíhá patně jako inserce iontů H3O1.
Permanent Link: http://hdl.handle.net/11104/0147645