CdS nanoparticles grown in situ on oxygen deficiency-rich WO3−x nanosheets: direct Z-scheme heterojunction towards enhancing visible light-driven hydrogen evolution,CrystEngComm

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CdS nanoparticles grown in situ on oxygen deficiency-rich WO3−x nanosheets: direct Z-scheme heterojunction towards enhancing visible light-driven hydrogen evolution
CrystEngComm ( IF 2.6 ) Pub Date : 2020-07-28 , DOI: 10.1039/d0ce00966k
Qi Ran _{1,

2,

3,

4} , Tao Zhong _{1,

2,

3,

4} , Fengyuan Li _{1,

2,

3,

4} , Zebin Yu _{1,

2,

3,

4} , Yanping Hou _{1,

2,

3,

4} , Lun Qian _{1,

2,

3,

4} , Jun Huang _{2,

3,

5,

6} , Ronghua Jiang _{7,

8,

9,

10} , Heqing Zhang _{1,

2,

3,

4} , Qianqian Sun _{1,

2,

3,

4}

Affiliation

The rapid separation and transport of photogenerated carriers are pivotal toward enhancing the photocatalytic performance. Herein, CdS nanoparticles are grown in situ on oxygen deficiency-rich WO_3−x nanosheets, successfully providing a direct Z-scheme CdS/WO_3−x heterojunction to enhance photocatalytic hydrogen production. We demonstrate an effective electron collection in the Z-scheme CdS/WO_3−x heterojunction by regulating the relative content of WO_3−x. The optimized CdS/20 wt% WO_3−x (CW20) affords a high photocatalytic hydrogen production rate of 6545.3 μmol g⁻¹ h⁻¹ in lactic acid aqueous solution under visible light (400–800 nm), which is about 54.1 times that of pure CdS (121.0 μmol g⁻¹ h⁻¹). In addition, CW20 also provides a considerable external quantum efficiency (EQE) of 10.03% at λ = 420 nm. The best-performing CW20 sample is explored by cyclic stability experiment and XRD characterization after hydrogen production, which reveals the robust stability of CW20. The excellent photocatalytic activity can be attributed to the formation of a Z-scheme CdS/WO_3−x heterojunction, resulting in an efficient spatial separation of photogenerated carriers. Electron and hole catalytic centers are maintained in two separate components to minimize the adverse products of photocatalytic hydrogen production. This study uncovers the role of oxygen deficiency based on the Z-scheme heterojunction in affecting electron transfer and reaction sites, opening new opportunities for achieving efficient hydrogen production.

中文翻译：

在富氧缺乏的WO3-x纳米片上原位生长的CdS纳米粒子：直接Z方案异质结指向增强可见光驱动的氢释放

光生载流子的快速分离和运输对于提高光催化性能至关重要。本文中，CdS纳米粒子在富含氧缺乏的WO ₃ - _x纳米片上原位生长，成功地提供了直接Z方案CdS / WO _{3- x}异质结以增强光催化氢的产生。我们证明有效的电子集合中的Z-方案的CdS / WO _{3- X}异质结通过调节WO的相对含量_{3- X}。优化的CdS / 20 wt％WO _{3- x}（CW20）可提供6545.3μmolg ^-1 h ^-1的高光催化制氢速率在可见光（400–800 nm）下在乳酸水溶液中溶解，约为纯CdS（121.0μmolg ^-1 h ^-1）的54.1倍。此外，CW20在λ = 420 nm时还提供了10.03％的可观外部量子效率（EQE）。通过循环稳定性实验和产氢后的XRD表征探索了性能最佳的CW20样品，揭示了CW20的鲁棒稳定性。优异的光催化活性可以归因于Z方案CdS / WO _{3- x的形成}异质结，导致光生载流子的有效空间分离。电子和空穴催化中心保持在两个单独的组件中，以最大程度地减少光催化制氢的不利产物。这项研究揭示了基于Z型异质结的缺氧在影响电子转移和反应位点方面的作用，为实现高效制氢开辟了新机会。

更新日期：2020-09-14

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