Using angle resolved photoemission spectroscopy, the electronic structures of Pt-skin layer of Pt-Co and Pt-Ni alloys are investigated as CO molecules are adsorbed on the surface. Measured Fermi surface maps and band dispersions reflect the signatures of chemical bonding between Pt-skin layer with CO molecules. Furthermore, the degree of chemical bonding strength is estimated from the shift of the participating band structure, exhibiting the reduced chemical bonding strength of CO molecules on both Pt bimetallic alloys. Our results reveal how the surface band structure of Pt bimetallic alloys is modified with molecular orbitals of CO molecules at the surface, revealing the important role of the electronic structure in the determination of chemical properties of bimetallic alloys.

使用角分辨光电子能谱，研究了 Pt-Co 和 Pt-Ni 合金的 Pt-skin 层的电子结构，因为 CO 分子被吸附在表面上。测量的费米表面图和能带色散反映了 Pt 表层与 CO 分子之间化学键合的特征。此外，化学键强度的程度是根据参与能带结构的位移来估计的，这表明两种 Pt 双金属合金上 CO 分子的化学键强度都降低。我们的研究结果揭示了 Pt 双金属合金的表面能带结构如何被表面 CO 分子的分子轨道修饰，揭示了电子结构在确定双金属合金化学性质中的重要作用。