Voltammetric and UHV characterisation of the (1 x 1) and reconstructed hex-R0.7° phases of Pt{100}

被引:39
作者
Al-Akl, A [1 ]
Attard, GA [1 ]
Price, R [1 ]
Timothy, B [1 ]
机构
[1] Univ Wales, Dept Chem, Cardiff CF1 3TB, S Glam, Wales
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1999年 / 467卷 / 1-2期
基金
英国工程与自然科学研究理事会;
关键词
voltammetry; Pt{100} electrodes; UHV;
D O I
10.1016/S0022-0728(99)00038-8
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The voltammetry of the clean (1 x 1) and reconstructed hex-R0.7 degrees phases of Pt{100} prepared in UHV are reported. By comparison with the UHV data, both phases may readily be prepared using a flame-annealing procedure so long as the conditions of sample cooling are precisely controlled. The well-ordered (1 x 1) phase may be formed by cooling in hydrogen. Back transfer to UHV of the hydrogen-cooled sample gave rise to a p(1 x 1) LEED pattern. These findings are in accordance with previous investigations [Attard and Price, Surf. Sci. 335 (1995) 63 and erratum; Al-Akl et al., J. Chem. Soc. Faraday Trans. 91 (1995) 3585; Sashikata et al., Langmuir 14 (1998) 2896; Tidswell et al., Phys. Rev. Lett. 71 (1993) 1601]. The voltammetry of the UHV-prepared hex-R0.7 degrees phase can be obtained only after a flame-anneal treatment by cooling rapidly in a flow of inert gas such as argon in which oxygen has been rigorously excluded. In contrast to the hydrogen cooled Pt{100} electrode, subsequent LEED analysis of the argon cooled sample showed a reconstruction pattern similar, though not identical to one reported recently by Zei et al. for a partially deconstructed Pt{100} electrode. On the basis of these results it is suggested that the p(1 x 1) and hex-R0.7 degrees phases of Pt{100} may be prepared under ambient conditions in an electrochemical cell. Although the potentials at which the reconstructed phase is stable are different from those reported by Zei and co-workers, the data do support their earlier results showing that the reconstructed phase of Pt{100} is stable when in contact with electrolyte solutions. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:60 / 66
页数:7
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