Electrochemical and AFM study of cobalt nucleation mechanisms on glassy carbon from ammonium sulfate solutions

被引：119

作者：

Grujicic, D ^{[1
]}

Pesic, B ^{[1
]}

机构：

[1] Univ Idaho, Coll Engn, Dept Mat Sci & Engn, Moscow, ID 83844 USA

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 26期

基金：

美国国家科学基金会;

关键词：

cobalt nucleation; glassy carbon electrode; ammonia; cyclic voltammetry; chronoamperometry; atomic force microscopy;

D O I：

10.1016/j.electacta.2004.05.028

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Nucleation mechanisms of cobalt on a glassy carbon electrode (gce) from aqueous ammonium sulfate solutions were investigated through the electrochemical techniques of cyclic voltammetry (cv) and chronoamperometry (ca), coupled with atomic force microscopy (AFM) studies. The studied parameters were pH, cobalt concentration, temperature, scanning rate, and deposition potential. It was found that scanning in the cathodic direction produced two peaks, corresponding to cobalt and hydrogen reduction, respectively. Scanning in the anodic direction was characterized by cobalt dissolution, which was interrupted by formation of cobalt hydroxide, causing a second anodic peak. The amperometric study found progressive nucleation mechanisms, in contrast to the instantaneous nucleation mechanisms determined by the AFM study. An explanation for the contradictory nucleation mechanisms shown in the two studies is provided. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4719 / 4732

页数：14

共 28 条

[21] Influence of the coordination sphere on the mechanism of cobalt nucleation onto glassy carbon [J].

Palomar-Pardave, M ;

Gonzalez, I ;

Soto, AB ;

Arce, EM .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1998, 443 (01) :125-136

[22]

PARDAVE MP, 1996, J ELECTROCHEM SOC, V143, P1551

[23]

POURBAIX M, 1974, ATLAS ELECTROCHEMICA, P328

[24] ANODIC-OXIDATION OF COBALT IN NEUTRAL AND BASIC SOLUTION [J].

SATO, N ;

OHTSUKA, T .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1978, 125 (11) :1735-1740

[25] THEORETICAL AND EXPERIMENTAL STUDIES OF MULTIPLE NUCLEATION [J].

SCHARIFKER, B ;

HILLS, G .

ELECTROCHIMICA ACTA, 1983, 28 (07) :879-889

[26] Electrochemical nucleation of cobalt onto glassy carbon electrode from ammonium chloride solutions [J].

Soto, AB ;

Arce, EM ;

PalomarPardave, M ;

Gonzalez, I .

ELECTROCHIMICA ACTA, 1996, 41 (16) :2647-2655

[27]

TABAKOVIC I, 1998, EL SOC P PV 98 20 PE, P531

[28] Hydrodynamic behaviour of the FM01-LC reactor [J].

Trinidad, P ;

Walsh, FC .

ELECTROCHIMICA ACTA, 1996, 41 (04) :493-502

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