Crystal facet of materials is an important parameter that affects the catalytic properties of photocatalysts. In this study, taking CdS as a prototype, we demonstrate the different role of facet as surface active site and interfacial charge migration channel. CdS nanorods exposed with {100} facet and CdS nanosheets exposed with {001} facet can be synthesized via simple wet chemical methods. In photocatalytic reaction, experimental results demonstrate that pristine CdS nanorods show higher hydrogen evolution rate (16.99 μmol/h) than that of pristine CdS nanosheets (4.97 μmol/h). As a contrast, when integrating with Pt cocatalyst forming Pt-CdS hybrids, the loading of Pt can improve the hydrogen evolution rate of CdS nanorods by 9.99-folds, significantly lower than CdS nanosheets (26.41-folds). In the case of using pristine CdS as catalysts, {100} facet is more beneficial for proton adsorption compared to {001} facet, leading to higher performance of CdS nanorods exposed with {100} facet as surface reaction sites. As for Pt/CdS catalysts, photogenerated electrons can more effectively transfer across the CdS {001}-Pt interface than that of CdS {100}-Pt interface, resulting in higher enhancement factors of CdS nanosheets after loading of Pt cocatalysts. These results may provide ideas for designing photocatalysts based on facet engineering.

材料的晶面是影响光催化剂催化性能的重要参数。在这项研究中，我们以 CdS 为原型，展示了刻面作为表面活性位点和界面电荷迁移通道的不同作用。暴露于{100}面的CdS纳米棒和暴露于{001}面的CdS纳米片可以通过简单的湿化学方法合成。在光催化反应中，实验结果表明，原始 CdS 纳米棒的析氢速率 (16.99 μmol/h) 高于原始 CdS 纳米片 (4.97 μmol/h)。作为对比，当与 Pt 助催化剂结合形成 Pt-CdS 杂化物时，Pt 的负载可以将 CdS 纳米棒的析氢速率提高 9.99 倍，显着低于 CdS 纳米片（26.41 倍）。在使用原始 CdS 作为催化剂的情况下，与{001}面相比，{100}面更有利于质子吸附，导致暴露于{100}面作为表面反应位点的CdS纳米棒具有更高的性能。对于 Pt/CdS 催化剂，与 CdS {100}-Pt 界面相比，光生电子可以更有效地穿过 CdS {001}-Pt 界面，导致负载 Pt 助催化剂后 CdS 纳米片的增强因子更高。这些结果可能为基于面工程设计光催化剂提供思路。在负载 Pt 助催化剂后导致 CdS 纳米片的增强因子更高。这些结果可能为基于面工程设计光催化剂提供思路。在负载 Pt 助催化剂后导致 CdS 纳米片的增强因子更高。这些结果可能为基于面工程设计光催化剂提供思路。