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Atomically Flat Pt Skin and Striking Enrichment of Co in Underlying Alloy at Pt3Co(111) Single Crystal with Unprecedented Activity for the Oxygen Reduction Reaction.
ACS Omega ( IF 3.7 ) Pub Date : 2018-01-17 , DOI: 10.1021/acsomega.7b01793 Shun Kobayashi 1 , Makoto Aoki 2 , Mitsuru Wakisaka 3 , Teppei Kawamoto 4 , Ryo Shirasaka 1 , Kohei Suda 4 , Donald A Tryk 4 , Junji Inukai 1 , Toshihiro Kondo 5 , Hiroyuki Uchida 1
ACS Omega ( IF 3.7 ) Pub Date : 2018-01-17 , DOI: 10.1021/acsomega.7b01793 Shun Kobayashi 1 , Makoto Aoki 2 , Mitsuru Wakisaka 3 , Teppei Kawamoto 4 , Ryo Shirasaka 1 , Kohei Suda 4 , Donald A Tryk 4 , Junji Inukai 1 , Toshihiro Kondo 5 , Hiroyuki Uchida 1
Affiliation
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By the use of in situ scanning tunneling microscopy and surface X-ray scattering techniques, we have clarified the surface structure and the layer-by-layer compositions of a Pt skin/Pt3Co(111) single-crystal electrode, which exhibited extremely high activity for the oxygen reduction reaction. The topmost layer was found to be an atomically flat Pt skin with (1 × 1) structure. Cobalt was enriched in the second layer up to 98 atom %, whereas the Co content in the third and fourth layers was slightly smaller than that in the bulk. By X-ray photoelectron spectroscopy, the Co in the subsurface layers was found to be positively charged, which is consistent with an electronic modification of the Pt skin. The extremely high activity at the Pt skin/Pt3Co(111) single crystal is correlated with this specific surface structure.
中文翻译：
Pt3Co（111）单晶上原子平坦的Pt皮和底层合金中Co的明显富集，具有前所未有的氧还原反应活性。
通过使用原位扫描隧道显微镜和表面X射线散射技术，我们弄清了具有极高活性的Pt皮/ Pt3Co（111）单晶电极的表面结构和逐层组成。用于氧还原反应。发现最顶层是具有（1×1）结构的原子平坦的Pt蒙皮。钴在第二层中的富集度高达98％（原子），而第三层和第四层中的Co含量略低于块状中的Co。通过X射线光电子能谱，发现地下层中的Co带正电，这与Pt皮肤的电子修饰相一致。在Pt皮/ Pt3Co（111）单晶上的极高活性与这种特定的表面结构相关。
更新日期：2018-01-17
中文翻译：
Pt3Co（111）单晶上原子平坦的Pt皮和底层合金中Co的明显富集，具有前所未有的氧还原反应活性。
通过使用原位扫描隧道显微镜和表面X射线散射技术，我们弄清了具有极高活性的Pt皮/ Pt3Co（111）单晶电极的表面结构和逐层组成。用于氧还原反应。发现最顶层是具有（1×1）结构的原子平坦的Pt蒙皮。钴在第二层中的富集度高达98％（原子），而第三层和第四层中的Co含量略低于块状中的Co。通过X射线光电子能谱，发现地下层中的Co带正电，这与Pt皮肤的电子修饰相一致。在Pt皮/ Pt3Co（111）单晶上的极高活性与这种特定的表面结构相关。
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