BARRIER PROPERTIES OF A THIN-FILM OF 4-PENTADECYLPYRIDINE COATED AT AU(111) ELECTRODE SURFACE

被引:21
作者
BIZZOTTO, D [1 ]
MCALEES, A [1 ]
LIPKOWSKI, J [1 ]
MCCRINDLE, R [1 ]
机构
[1] UNIV GUELPH,GUELPH WATERLOO CTR GRAD WORK CHEM,DEPT CHEM & BIOCHEM,GUELPH,ON N1G 2W1,CANADA
关键词
D O I
10.1021/la00008a058
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The reduction of Fe(CN)(6)(3-) at the Au(111) electrode coated with a thin film of 4-pentadecylpyridine (C15-4-Py) was investigated. The C15-4-Py molecules form a multilayer at the Au(111) surface which may be repeatedly adsorbed and desorbed by varying the electrode potential. At E > -0.2 V (SCE) the film has a very compact structure. Its capacity is lower than 1 mu F cm(-2) and it exhibits strong blocking behavior with respect to the reduction of Fe(CN)(6)(3-). At potentials -0.6 V (SCE) < E < -0.3 V (SCE) the film is less rigid. Its capacity increases to about 2 mu F cm(-2) and it is more porous. The rate of Fe(CN)(6)(3-) reduction at the film covered electrode is characteristic of nonlinear diffusion to active pores separated by inactive areas. The average pore size changes between 10 mu m and about 30 mu m and the pore separation varies between 200 and 500 mu m for -0.6 V (SCE) < E < -0.3 V (SCE). In this range the pore density changes from 100 to 6 x 10(3) pores/cm(2).
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页码:3243 / 3250
页数:8
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