Effect of sulfuric acid concentration on the structure of sulfate adlayer on Au(1 1 1) electrode
Effect of sulfuric acid concentration on the structure of sulfate adlayer on Au(1 1 1) electrode
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DOI：
10.1016/j.elecom.2006.03.001
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发表时间：
2006-05
影响因子：
5.4
通讯作者：
Kazuhiro Sato;Soichiro Yoshimoto;J. Inukai;K. Itaya
中科院分区：
文献类型：
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作者：
Kazuhiro Sato;Soichiro Yoshimoto;J. Inukai;K. Itaya
通过循环伏安法和原位扫描隧道显微镜（STM）在不同浓度（0.5-7.5M）的硫酸溶液中检测硫酸盐在Au（111）单晶电极上的吸附。原位STM在0.5M硫酸中发现了著名的具有(√3×√7)晶胞的硫酸盐吸附层。在2.5和5.0M硫酸中，发现从(√3×√7)吸附层到无序结构的新的有序-无序相变发生在大约。 1.1V 与 Ag∣AgCl∣KCl（饱和）。在7.5M硫酸中，CV曲线中没有看到电流尖峰，原位STM显示硫酸盐吸附层是无序的。
The adsorption of sulfate on Au(111) single-crystal electrode was examined in sulfuric acid solutions of various concentrations (0.5–7.5M) by cyclic voltammetry and in situ scanning tunneling microscopy (STM). The well-known sulfate adlayer with (√3×√7) unit cell was found in 0.5M sulfuric acid by in situ STM. In 2.5 and 5.0M sulfuric acid, a new order–disorder phase transition, from the (√3×√7) adlayer to a disordered structure, was found to take place at ca. 1.1V vs. Ag∣AgCl∣KCl(sat.). In 7.5M sulfuric acid, no current spikes were seen in the CV profile, and in situ STM showed that the sulfate adlayer was disordered.