Electrochemical characterization of a novel salen-type modified electrode

被引:103
作者
Vilas-Boas, M
Freire, C
de Castro, B
Hillman, AR
机构
[1] Univ Porto, Fac Ciencias, Dept Quim, CEQUP, P-4150 Porto, Portugal
[2] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 43期
关键词
D O I
10.1021/jp982160r
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The nickel(II) complex with H(2)saltMe, a N2O2 Schiff base ligand derived from salicylaldehyde, was oxidatively electropolymerized on Pt electrodes in CH3CN/0.1 mol dm(-3) tetraethylammonium perchlorate (TEAP) to generate polymer films that exhibit reversible oxidative electrochemical behavior in a wide potential range (0.0-1.3 V), high conductivity, and stability/durability. The films of poly[Ni(saltMe)] can be made to exhibit the three regimes of charge transport behavior by manipulation of the film thickness and the experimental time scale, Films prepared by a small number of potential cycles show thin-layer/surface-type cyclic voltammetry behavior in the scan rate range used. Thicker polymers exhibit a changeover from this thin-layer regime to diffusion control at a critical scan rate that depends on film thickness. In chronoamperometry experiments a transition from semiinfinite diffusion to finite diffusion conditions was observed at longer times following the potential step. Values of (DC)-C-1/2 for the second electrochemical stage of film oxidation redox obtained from both techniques were in good agreement. A comparison of the values for oxidative and reductive electrochemical reactions suggests that ingress of counterions and solvent swelling must occur predominantly up to 0.8V in the positive going potential scan.
引用
收藏
页码:8533 / 8540
页数:8
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