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

被引：55

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

页码：2426 / 2431

页数：6

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