Here we realize the decoration of isolated platinum atoms onto the surface step of CdS nanowires. The single-atom co-catalyst with high stability can realize maximum atom efficiency and significantly boost electron-hole separation efficiency in chromophore units, generating a greatly enhanced photocatalytic hydrogen evolution performance, 7.69 times as high as Pt nanoparticles do and 63.77 times higher than that of bare CdS nanowires. Directional migrations of photogenerated excitons from the conduction band of CdS to catalytic platinum centers have been witnessed by transient absorption spectroscopy, leading to the supply of long-lived electrons for highly efficient photocatalytic hydrogen evolution. Density functional theory calculations further confirm that the excellent catalytic performance is associated with positively charged platinum sites with partially vacant 5d orbitals, which change distribution of charge density and facilitate higher excited carrier density.

在这里，我们实现了将隔离的铂原子装饰到CdS纳米线的表面台阶上的功能。具有高稳定性的单原子助催化剂可以实现最大的原子效率，并显着提高生色团单元中的电子-空穴分离效率，产生大大增强的光催化氢释放性能，是Pt纳米颗粒的7.69倍，比Pt纳米颗粒高63.77倍。裸露的CdS纳米线。瞬态吸收光谱法已经证明了光生激子从CdS的导带向催化铂中心的定向迁移，从而为高效光催化氢的释放提供了长寿命电子。