AN ELECTROCHEMICAL QUARTZ-CRYSTAL MICROBALANCE STUDY OF LITHIUM INSERTION INTO THIN-FILMS OF TUNGSTEN TRIOXIDE .1. MODELING OF THE IONIC INSERTION MECHANISM

被引:44
作者
BOHNKE, O
VUILLEMIN, B
GABRIELLI, C
KEDDAM, M
PERROT, H
TAKENOUTI, H
TORRESI, R
机构
[1] UNIV MAINE,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE
[2] UNIV BOURGOGNE,RECH REACT SOLIDES LAB,CNRS,URA 23,F-21004 DIJON,FRANCE
[3] UNIV PARIS 06,CNRS,UPR 15,F-75252 PARIS 05,FRANCE
关键词
IONIC INSERTION; ELECTROCHEMICAL QUARTZ CRYSTAL MICROBALANCE; AC IMPEDANCE SPECTROSCOPY; THIN FILMS; TUNGSTEN TRIOXIDE;
D O I
10.1016/0013-4686(95)00254-C
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A theoretical description of the mechanism of lithium insertion into amorphous thin films of tungsten trioxide (a-WO3) prepared by thermal vacuum evaporation of WO3 powder is presented. The model developed is based on the experimental results obtained by chronoamperometry and ac impedance spectroscopy associated with electrochemical quartz crystal microbalance (EQCM). The electrode mass change and the current flowing through the electrochemical cell during cathodic polarization are simultaneously recorded. As expected, it can be observed that the insertion process is associated with a gain of mass of the inserted electrode at long times (t > 1 s). On the other hand at short times (t < 1 s) a net loss of mass is observed. The existence of a non faradaic surface process involving the expulsion of anions from the electrode surface and occuring simultaneously with the faradaic insertion of non-solvated lithium ions into the oxide layer is discussed.
引用
收藏
页码:2755 / 2764
页数:10
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