Effect of sulfuric acid concentration on the structure of sulfate adlayer on Au(111) electrode

被引：46

作者：

Sato, Kazuhiro

Yoshimoto, Soichiro

Inukai, Junji

Itaya, Kingo

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, NICHE, Sendai, Miyagi 9808579, Japan

[3] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2006年 / 8卷 / 05期

关键词：

Au(111); sulfuric acid solution; concentration; in situ STM; sulfate adlayer; phase transition;

D O I：

10.1016/j.elecom.2006.03.001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The adsorption of sulfate on A(111) single-crystal electrode was examined in sulfuric acid solutions of various concentrations (0.5-7.5 M) by cyclic voltammetry and in situ scanning tunneling microscopy (STM). The well-known sulfate adlayer with (root 3 x root 7) unit cell was found in 0.5 M sulfuric acid by in situ STM. In 2.5 and 5.0 M sulfuric acid, a new order-disorder phase transition, from the (root 3 x root 7) adlayer to a disordered structure, was found to take place at ca. 1.1 V vs. Ag vertical bar AgCl vertical bar KCl(sat.). In 7.5 M sulfuric acid, no current spikes were seen in the CV profile, and in situ STM showed that the sulfate adlayer was disordered. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：725 / 730

页数：6

共 37 条

[1] ELEMENTARY STEPS OF ELECTROCHEMICAL OXIDATION OF SINGLE-CRYSTAL PLANES OF AU .1. CHEMICAL BASIS OF PROCESSES INVOLVING GEOMETRY OF ANIONS AND THE ELECTRODE SURFACES [J].