Surface X-ray scattering of stepped surfaces of platinum in an electrochemical environment: Pt(331) = 3(111)-(111) and Pt(511) = 3(100)-(111) |
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Authors: | Hoshi Nagahiro Nakamura Masashi Sakata Osami Nakahara Akira Naito Keita Ogata Hiroyuki |
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Institution: | Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522 Japan. hoshi@faculty.chiba-u.jp |
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Abstract: | Real surface structures of the high-index planes of Pt with three atomic rows of terraces (Pt(331) = 3(111)-(111) and Pt(511) = 3(100)-(111)) have been determined in 0.1 M HClO(4) at 0.1 and 0.5 V(RHE) with the use of surface X-ray scattering (SXS). The surfaces with two atomic rows of terraces, Pt(110) = 2(111)-(111) and Pt(311) = 2(100)-(111) = 2(111)-(100), are reconstructed to a (1 × 2) structure according to previous studies. However, the surfaces with three atomic rows of terraces have pseudo-(1 × 1) structures. The interlayer spacing between the first and the second layers, d(12), is expanded 13% on Pt(331) compared to that of the bulk, whereas it is contracted 37% on Pt(511). The surface structures do not depend on the applied potential on either surface. |
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