THE SURFACE-DIFFUSION OF GOLD ATOMS ON GOLD ELECTRODES IN ACID-SOLUTION AND ITS DEPENDENCE ON THE PRESENCE OF FOREIGN ADSORBATES

被引:85
作者
ALONSO, C
SALVAREZZA, RC
VARA, JM
ARVIA, AJ
机构
[1] Departamento de Química, Facultad de Ciencias, Universidad Autónoma de Madrid
关键词
D O I
10.1016/0013-4686(90)85003-6
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The surface diffusion coefficient (Ds) of Au atoms in 0.5 M H2SO4 at 298 K has been determined from the time dependence of the surface roughness factor of electrodispersed Au electrodes in 0.5 M H2SO4. The value of Ds for 0.5 M H2SO4 is 5 × 10-14 cm2 s-1, a figure which depends considerably on the presence of adsorbable species in solution. Thus, the adsorption of pyridine produces a remarkable decrease of Ds, Whereas the adsorption of Cl- ion results in the opposite effect. The corresponding values of Ds are 1.2 × 10-14 cm2 s-1 for 0.5 M H2SO4 + 0.1 M pyridine, and 2.5 × 10-13 cm2 s-1 for 0.5 M H2SO4 + 5 × 10-4 M KCl. These results are interpreted through the influence of the adsorbate on the Au surface atom diffusion mechanism. © 1990.
引用
收藏
页码:1331 / 1336
页数:6
相关论文
共 35 条
[1]  
ALONSO C, IN PRES J ELECTROCHE
[2]   ELEMENTARY STEPS OF ELECTROCHEMICAL OXIDATION OF SINGLE-CRYSTAL PLANES OF AU .2. A CHEMICAL AND STRUCTURAL BASIS OF OXIDATION OF THE (111) PLANE [J].
ANGERSTEINKOZLOWSKA, H ;
CONWAY, BE ;
HAMELIN, A ;
STOICOVICIU, L .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1987, 228 (1-2) :429-453
[3]   THE DEVELOPMENT OF METAL OVERLAYERS WITH SMOOTH AND ROUGH TOPOGRAPHIES [J].
ARVIA, AJ ;
SALVAREZZA, RC ;
TRIACA, WE .
ELECTROCHIMICA ACTA, 1989, 34 (08) :1057-1071
[4]   ANION AND PH EFFECTS ON POTENTIALS OF ZERO CHARGE OF GOLD AND SILVER ELECTRODES [J].
BODE, DD ;
ANDERSEN, TN ;
EYRING, H .
JOURNAL OF PHYSICAL CHEMISTRY, 1967, 71 (04) :792-&
[5]  
Bonzel H. P., 1975, SURFACE PHYSICS MATE, P280
[6]  
CHAKRAVE.BK, 1967, J PHYS CHEM SOLIDS, V28, P2401, DOI 10.1016/0022-3697(67)90026-1
[7]   CHANGES IN THE POLYCRYSTALLINE GOLD ELECTRODE SURFACE PRODUCED BY SQUARE-WAVE POTENTIAL PERTURBATIONS [J].
CHIALVO, AC ;
TRIACA, WE ;
ARVIA, AJ .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1984, 171 (1-2) :303-316
[8]   CHANGES IN THE ELECTROCHEMICAL RESPONSE OF NOBLE-METALS PRODUCED BY SQUARE-WAVE POTENTIAL PERTURBATIONS - A NEW TECHNIQUE FOR THE PREPARATION OF REPRODUCIBLE ELECTRODE SURFACES OF INTEREST IN ELECTROCATALYSIS [J].
CHIALVO, AC ;
TRIACA, WE ;
ARVIA, AJ .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1983, 146 (01) :93-108
[9]   STM STUDY OF THE SURFACE-MORPHOLOGY OF GOLD ON MICA [J].
CHIDSEY, CED ;
LOIACONO, DN ;
SLEATOR, T ;
NAKAHARA, S .
SURFACE SCIENCE, 1988, 200 (01) :45-66
[10]  
DICKERTMANN D, 1974, J ELECTROANAL CHEM, V59, P429