Lin Qingzhuo, Liang Shudong, Wang Jintao, Zhang Rongbin, Wang Xuewen
Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, the College of Chemistry, Nanchang University, 999 Xuefu Road, Nanchang 330031, China.
Inorg Chem. 2022 Feb 14;61(6):2920-2928. doi: 10.1021/acs.inorgchem.1c03798. Epub 2022 Feb 1.
Cadmium sulfide is a potential candidate for photocatalytic water splitting. However, CdS nanoparticles have a high recombination rate of photoinduced carriers induced by aggregation. Therefore, decreasing the recombination rate and increasing the migration rate of photogenerated carriers are essential to drive the development and application of CdS in hydrogen production. In this study, we design CdS with a three-dimensional ordered macroporous (3DOM) structure using polymethylmethacrylate as a template. It not only retains the excellent visible light response of CdS but also improves the easy recombination of photogenerated carriers in CdS nanoparticles by taking advantage of the unique ability of mass transfer, charge separation, and migration in the 3DOM structure. Meanwhile, the highly ordered periodic structure of 3DOM CdS can produce a slow photon effect of photonic crystals to obtain more photoinduced carriers. In particular, we found that a suitable stop-band position is beneficial to maximize the utilization of the slow photon effect. The photocatalytic hydrogen evolution rate of Pt-CdS is considerably improved after constructing the 3DOM structure. This study provides a new design strategy of ordered macroporous sulfide catalysts to achieve high photocatalytic activity.
硫化镉是光催化水分解的潜在候选材料。然而，硫化镉纳米颗粒因聚集导致光生载流子的复合率较高。因此，降低复合率并提高光生载流子的迁移率对于推动硫化镉在制氢方面的发展和应用至关重要。在本研究中，我们以聚甲基丙烯酸甲酯为模板设计了具有三维有序大孔（3DOM）结构的硫化镉。它不仅保留了硫化镉优异的可见光响应，还利用3DOM结构中独特的传质、电荷分离和迁移能力改善了硫化镉纳米颗粒中光生载流子容易复合的问题。同时，3DOM硫化镉的高度有序周期性结构可产生光子晶体的慢光效应以获得更多光生载流子。特别地，我们发现合适的禁带位置有利于最大化慢光效应的利用。构建3DOM结构后，Pt-CdS的光催化析氢速率有显著提高。本研究为实现高光催化活性提供了一种有序大孔硫化物催化剂的新设计策略。
