ZnxCd1-xS quantum dot with enhanced photocatalytic H2-production performance
ZnxCd1-xS quantum dot with enhanced photocatalytic H2-production performance
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DOI：
10.1016/s1872-2067(20)63614-2
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发表时间：
2021-01-01
影响因子：
16.5
通讯作者：
Ho, Wingkei
中科院分区：
文献类型：
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作者：
Gao, Rongrong;Cheng, Bei;Ho, Wingkei
氢气具有能量密度高、环境友好等优点，是未来替代化石燃料的重要能源载体。作为一种可持续的制氢方法，光催化裂解制氢已引起人们的极大兴趣。本文采用热注射法制备了粒径分布均匀的油溶型锌镉镉量子点(ZCS QD)。然而，由于ZCS QD的疏水性，没有观察到它的光催化产氢活性。因此，通过配体交换的方法将油溶性ZCS QD转化为水溶性ZCS QD。水溶性ZCS QD在甘油和Ni2+存在下表现出良好的光催化产氢性能，在420 nm光照射下的表观量子效率为15.9%。此外，ZCS量子点的光催化产氢活性是传统共沉淀法制备的相对样品的10.7倍。这项工作将对其他半导体量子点光催化剂的设计和制备起到启发作用，因为量子点由于其细小的晶体尺寸而对光生电子-空穴对表现出优异的分离效率。(C)2021年，中国科学院大连化学物理研究所。爱思唯尔出版，版权所有。
H-2 is an important energy carrier for replacing fossil fuel in the future due to its high energy density and environmental friendliness. As a sustainable H-2-generation method, photocatalytic H-2 production by water splitting has attracted much interest. Here, oil-soluble ZnxCd1-xS quantum dot (ZCS QD) with a uniform particle size distribution were prepared by a hot-injection method. However, no photocatalytic H-2-production activity was observed for the oil-soluble ZCS QD due to its hydrophobicity. Thus, the oil-soluble ZCS QD was converted into a water-soluble ZCS QD by a ligand-exchange method. The water-soluble ZCS QD exhibited excellent photocatalytic H-2-production performance in the presence of glycerin and Ni2+, with an apparent quantum efficiency of 15.9% under irradiation of 420 nm light. Further, the photocatalytic H-2-generation activity of the ZCS QD was similar to 10.7 times higher than that of the ZnxCd1-xS relative samples prepared by the conventional co-precipitation method. This work will inspire the design and fabrication of other semiconductor QD photocatalysts because QD exhibits excellent separation efficiency for photogenerated electron-hole pairs due to its small crystallite size. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.