Influence of the adsorbate structure and surface barrier at micropores. The adsorption on columnar-structured gold electrodes of pyridine from aqueous perchlorate ion-containing solutions

被引:12
作者
Gomez, MM
Garcia, MP
SanFabian, J
Vazquez, L
Salvarezza, RC
Arvia, AJ
机构
[1] INST INVEST FIS QUIM TEORICAS & APLICADAS,RA-1900 LA PLATA,BUENOS AIRES,ARGENTINA
[2] UNIV AUTONOMA MADRID,FAC CIENCIAS,DEPT QUIM FIS APLICADA,MADRID 28049,SPAIN
关键词
D O I
10.1021/la950937r
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The electroadsorption on columnar Au electrodes (substrate) of pyridine from x M pyridine + 0.1 M HClO4 and x M pyridine + 0.1 M KClO4 aqueous solutions (10(-3) less than or equal to x less than or equal to 10(-2)), at constant potential and 298 K, was studied using voltammetry, chronocoulometry, and ac impedance combined with scanning tunneling microscopy to characterize the substrate topography. For a constant pyridine concentration (c), the degree of surface coverage by pyridine adsorbate (theta) diminished as R was increased. The theta vs c plots, irrespective of R, were interpreted by a Frumkin adsorption isotherm including a constant standard adsorption free energy. The evaluation of adsorption isotherms reflects the existence of an excluded volume effect, which can be related to a barrier effect due to adsorbates at nanometer size pore entrances.
引用
收藏
页码:1317 / 1326
页数:10
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