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Cadmium Sulfide 3D Photonic Crystal with Hierarchically Ordered Macropores for Highly Efficient Photocatalytic Hydrogen Generation
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-02-01 , DOI: 10.1021/acs.inorgchem.1c03798 Qingzhuo Lin 1 , Shudong Liang 1 , Jintao Wang 1 , Rongbin Zhang 1 , Xuewen Wang 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-02-01 , DOI: 10.1021/acs.inorgchem.1c03798 Qingzhuo Lin 1 , Shudong Liang 1 , Jintao Wang 1 , Rongbin Zhang 1 , Xuewen Wang 1
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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.
中文翻译：
具有分级有序大孔的硫化镉 3D 光子晶体用于高效光催化制氢
硫化镉是光催化水分解的潜在候选者。然而，CdS纳米粒子具有由聚集诱导的光诱导载流子的高复合率。因此，降低复合率、提高光生载流子的迁移率对于推动CdS在制氢中的发展和应用至关重要。在这项研究中，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 CdS。它不仅保留了CdS优异的可见光响应，而且利用3DOM结构中独特的传质、电荷分离和迁移能力，提高了CdS纳米粒子中光生载流子的易复合性。同时，3DOM CdS高度有序的周期性结构可以产生光子晶体的慢光子效应，从而获得更多的光生载流子。特别是，我们发现合适的阻带位置有利于最大限度地利用慢光子效应。构建3DOM结构后，Pt-CdS的光催化析氢速率显着提高。该研究提供了一种新的有序大孔硫化物催化剂设计策略，以实现高光催化活性。
更新日期：2022-02-01
中文翻译：
具有分级有序大孔的硫化镉 3D 光子晶体用于高效光催化制氢
硫化镉是光催化水分解的潜在候选者。然而，CdS纳米粒子具有由聚集诱导的光诱导载流子的高复合率。因此，降低复合率、提高光生载流子的迁移率对于推动CdS在制氢中的发展和应用至关重要。在这项研究中，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 CdS。它不仅保留了CdS优异的可见光响应，而且利用3DOM结构中独特的传质、电荷分离和迁移能力，提高了CdS纳米粒子中光生载流子的易复合性。同时，3DOM CdS高度有序的周期性结构可以产生光子晶体的慢光子效应，从而获得更多的光生载流子。特别是，我们发现合适的阻带位置有利于最大限度地利用慢光子效应。构建3DOM结构后，Pt-CdS的光催化析氢速率显着提高。该研究提供了一种新的有序大孔硫化物催化剂设计策略，以实现高光催化活性。
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