Novel β-NiS film modified CdS nanoflowers heterostructure nanocomposite: Extraordinarily highly efficient photocatalysts for hydrogen evolution
Novel β-NiS film modified CdS nanoflowers heterostructure nanocomposite: Extraordinarily highly efficient photocatalysts for hydrogen evolution
复制标题
新型β-NiS薄膜改性CdS纳米花异质结构纳米复合材料：非常高效的析氢光催化剂
DOI：
10.1016/j.apcatb.2017.11.043
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发表时间：
2018-05-01
影响因子：
22.1
通讯作者：
Fu, Xiuli
中科院分区：
文献类型：
--
作者：
Zhang, Yu;Peng, Zhijian;Fu, Xiuli
半导体基光催化剂与助催化剂的复合是获得高析氢效率的一种众所周知的有效策略，其形态和组成是大多数文献关注的问题。然而，他们之间一直难以改善的联系也是一个关键因素。本文通过简单的一锅水热法制备了一种新型的β -NiS膜修饰CdS纳米花（NiS/CdS NFs）异质结构纳米复合材料（HSNC）。所制得的NiS/CdS NFs HSNC具有良好的集成结构，半导体CdS NFs与共催化剂NiS薄膜之间具有较强的粘附性，具有良好的光电子转移能力和对可见光的高吸附能力。结果表明，该复合材料在可见光下具有非常高效的光催化析氢性能，在乳酸含量为20%的水溶液中具有很高的化学稳定性和结构稳定性。在25℃时，CdS-NiS复合催化剂的产氢速率最高，约为30.1 mmolh(-1) g(-1)，在420 nm处，表观量子效率最高，约为43%。提出了NiS/CdS纳米颗粒的生长和光催化机理。
The compositing of semiconductor based photocatalysts with cocatalysts is a well-known, effective strategy to acquire high hydrogen evolution efficiency, for which their morphology and composition are the concerns of most literatures. However, the contact between them, which has been always difficult to improve, is also a key factor. Here a novel beta-NiS film modified CdS nanoflowers (NiS/CdS NFs) heterostructure nanocomposite (HSNC) was successfully synthesized through a simple one-pot hydrothermal method. The obtained NiS/CdS NFs HSNC has well-constructed integrated structure of strong adhesion between the semiconducting CdS NFs and the co catalyst NiS thin films, displaying good transfer ability to photogenerated electrons and high adsorption to visible light together. Resultantly, the obtained composite presents extraordinarily highly efficient photo catalytic hydrogen evolution, and high chemical and structural stability in aqueous solution containing 20 vol.% lactic acid under visible light. The highest rate for hydrogen production reached a recorded value of about 30.1 mmolh(-1) g(-1) at 25 C among all CdS-NiS composite catalysts, and the highest apparent quantum efficiency was approximately 43% at 420 nm. The growth and photocatalysis mechanisms for the NiS/CdS NFs were proposed.