Effect of Non-Specifically Adsorbed Ions on the Surface Oxidation of Pt(111)

被引：53
|
作者：
Nakamura, Masashi [1 ]
Nakajima, Yo [1 ]
Hoshi, Nagahiro [1 ]
Tajiri, Hiroo [2 ]
Sakata, Osami [3 ]
机构：
[1] Chiba Univ, Grad Sch Engn, Dept Appl Chem & Biotechnol, Inage Ku, Chiba 2638522, Japan
[2] Japan Synchrotron Radiat Res Inst, Res & Utilizat Div, Hyogo, Japan
[3] Natl Inst Mat Sci, Synchrotron Xray Stn SPring 8, Hyogo, Japan
来源：
CHEMPHYSCHEM | 2013年 / 14卷 / 11期
关键词：
electrochemistry; IR spectroscopy; platinum; surface chemistry; X-ray diffraction; ELECTROCHEMICAL DOUBLE-LAYER; IN-SITU; WATER; ELECTRODE; INTERFACES; AU; CO;
D O I：
10.1002/cphc.201300404
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The oxidation processes of a Pt(111) electrode in alkaline electrolytes depend on non-specifically adsorbed ions according to in situ X-ray diffraction and infrared spectroscopic measurements. In an aqueous solution of LiOH, an OHad adlayer is formed in the first oxidation step of the Pt(111) electrode as a result of the strong interaction between Li+ and OHad, whereas Pt oxidation proceeds without OHad formation in CsOH solution. Structural analysis by X-ray diffraction indicates that Li+ is strongly protective against surface roughening caused by subsurface oxidation. Although Cs+ is situated near the Pt surface, the weak protective effect of Cs+ results in irreversible surface roughening due to subsurface oxidation.
引用
收藏
页码：2426 / 2431
页数：6
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