Effect of Non‐Specifically Adsorbed Ions on the Surface Oxidation of Pt(111) |
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| Authors: | Dr Masashi Nakamura Yo Nakajima Prof Dr Nagahiro Hoshi Dr Hiroo Tajiri Dr Osami Sakata |
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| Institution: | 1. Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi‐cho 1‐33 Inage‐ku, Chiba 263‐8522 (Japan);2. Research and Utilization Division, Japan Synchrotron Radiation Research Institute, Sayo‐gun, Hyogo (Japan);3. Synchrotron X‐ray Station at SPring‐8, National Institute for Material Science, Sayo‐gun, Hyogo (Japan) |
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| Abstract: | 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. |
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| Keywords: | electrochemistry IR spectroscopy platinum surface chemistry X‐ray diffraction |
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