Spectroelectrochemical identity of Prussian blue films in various electrolytes: comparison of time-derivative voltabsorptometric responses with conventional cyclic voltammetry

被引:44
作者
Kulesza, PJ
Zamponi, S
Malik, MA
Miecznikowski, K
Berrettoni, M
Marassi, R
机构
[1] Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland
[2] Univ Camerino, Dipartimento Sci Chim, I-62032 Camerino, Italy
[3] Czestochowa Tech Univ, Dept Met & Mat Engn, Div Gen Chem, PL-42200 Czestochowa, Poland
关键词
Prussian blue; voltabsorptometry; alkali metal cations; electrochromism;
D O I
10.1007/s100080050027
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Using Prussian blue (PB) electrodeposited on gold-covered foil as a model sq stem, we have demonstrated the usefulness of the time-derivative measurements of absorbance versus potential (linear potential-scan voltabsorptometry) for spectroelectrochemical characterization of thin electrochromic films. The time-derivative signals were monitored for PB at 680 and 420 nm in potassium. sodium and lithium electrolytes. Information obtained from cyclic voltabsorptometry is equivalent or complementary to that from conventional cyclic voltammetry. In the case of PB films investigated in lithium electrolyte, the voltabsorptometric time-derivative peaks are better defined than the respective voltammetric peaks. The combination of voltabsorptometry with voltammetry enables molar absorptivity and/or film loading to be determined. Also, concentration changes of differently colored mixed-valence redox centers can be monitored as a function of applied potential.
引用
收藏
页码:88 / 93
页数:6
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