PtNi_xCo_y concave nanocubes (CNCs) are synthesized using a hydrothermal method and decorated on the surface of CdS via a fast photo-deposition method (denoted as PtNi_xCo_y/CdS). The photocatalytic hydrogen evolution activity is investigated under visible light irradiation, and Pt/CdS exhibits a good hydrogen generation rate of about 37.80 mmol h⁻¹ g⁻¹ (QE = 44.64%, λ = 420 nm). Moreover, the performance of the PtNi_xCo_y CNCs is enhanced with the addition of Ni and Co, and the hydrogen generation rate of PtNiCo/CdS is as high as 50.60 mmol h⁻¹ g⁻¹ (QE = 56.82%, λ = 420 nm), which is 1.3-fold higher than that of Pt/CdS and also significantly higher than those of PtNi/CdS (42.71 mmol h⁻¹ g⁻¹) and PtCo_0.5/CdS (40.33 mmol h⁻¹ g⁻¹). The high photocatalytic performance could be explained by the high surface index and the highly unsaturated atom coordination of PtNiCo CNCs, and the synergistic effects of the tri-metals, which enhance the capturing ability of photo-generated electrons, and finally result in high charge separation and high charge transport between the alloy CNCs and CdS at the interface.

中文翻译：

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PtNixCoy凹形纳米立方体：合成及其在光催化制氢中的应用

使用水热法合成了PtNi _x Co _y凹形纳米立方体（CNC），并通过快速光沉积法（称为PtNi _x Co _y / CdS）在CdS的表面上进行了装饰。在可见光照射下研究了光催化氢释放活性，并且Pt / CdS表现出约37.80 mmol h ^-1 g ^-1的良好氢生成速率（QE = 44.64％，λ = 420 nm）。此外，添加Ni和Co可以增强PtNi _x Co _y CNC的性能，并且PtNiCo / CdS的氢生成速率高达50.60 mmol h ^-1 g^-1（QE = 56.82％， λ = 420 nm），比Pt / CdS高1.3倍，也显着高于PtNi / CdS（42.71 mmol h ^-1 g ^-1）和PtCo _0.5 / CdS（40.33 mmol h ^-1 g ^-1）。PtNiCo CNCs的高表面指数和高度不饱和的原子配位以及三金属的协同作用可以提高光催化性能，这可以增强光生电子的捕获能力，并最终导致高电荷分离以及界面处的合金CNC和CdS之间的高电荷传输。