原子级平整的铂表皮以及在PtCo(111)单晶底层合金中钴的显著富集，对氧还原反应具有前所未有的活性。
Atomically Flat Pt Skin and Striking Enrichment of Co in Underlying Alloy at PtCo(111) Single Crystal with Unprecedented Activity for the Oxygen Reduction Reaction.
作者信息
Kobayashi Shun, Aoki Makoto, Wakisaka Mitsuru, Kawamoto Teppei, Shirasaka Ryo, Suda Kohei, Tryk Donald A, Inukai Junji, Kondo Toshihiro, Uchida Hiroyuki
机构信息
Clean Energy Research Center, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan.
Division of Life, Medical, Natural Sciences and Technology, Organization for Advanced and Integrated Research, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 658-8501, Japan.
出版信息
ACS Omega. 2018 Jan 17;3(1):154-158. doi: 10.1021/acsomega.7b01793. eCollection 2018 Jan 31.
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/PtCo(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/PtCo(111) single crystal is correlated with this specific surface structure.
通过使用原位扫描隧道显微镜和表面X射线散射技术，我们阐明了Pt皮/PtCo(111)单晶电极的表面结构和逐层组成，该电极对氧还原反应表现出极高的活性。发现最顶层是具有(1×1)结构的原子级平整的Pt皮。钴在第二层中富集至98原子%，而第三层和第四层中的钴含量略低于体相中的含量。通过X射线光电子能谱，发现次表层中的钴带正电，这与Pt皮的电子修饰一致。Pt皮/PtCo(111)单晶的极高活性与这种特定的表面结构相关。
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