One-step hydrothermal synthesis of (CuIn)(0.2)Zn1.6S2 hollow sub-microspheres for efficient visible-light-driven photocatalytic hydrogen generation
One-step hydrothermal synthesis of (CuIn)(0.2)Zn1.6S2 hollow sub-microspheres for efficient visible-light-driven photocatalytic hydrogen generation
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一步水热合成(CuIn)(0.2)Zn1.6S2空心亚微球用于高效可见光驱动光催化制氢
DOI：
10.1016/j.ijhydene.2015.11.087
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发表时间：
2016
影响因子：
7.2
通讯作者：
Guo Liejin
中科院分区：
文献类型：
--
作者：
Chen Yubin;Qin Zhixiao;Guo Xu;Wang Xixi;Guo Liejin
以硫代乙酰胺(TAA)为硫源，采用简单的一步水热法制备了(CuIn)0.2Zn1.6S2(CIZs)中空亚微球。结果表明，TAA的含量对CIZ样品的形貌起着关键作用。较低的TAA含量导致了固体亚微球的形成。然而，TAA的高含量促进了中空亚微球的生长，这可以用气泡模板机制来解释。随着TAA含量的增加，样品的形态发生转变，微晶尺寸减小，比表面积增大。同时，随着TAA含量的增加，CIZ样品中的缺陷态逐渐减少。产物比表面积的提高和缺陷的减少有助于提高电荷分离和表面化学反应的效率。TAA用量对CIZ光催化剂的光催化性能有很大影响。当TAA用量为5 g时，制备的CIZS样品的产氢速率最高，在420 nm处的表观量子产率为11.5%。结果表明，催化剂具有较大的比表面积、较少的缺陷和相对清洁的表面，具有较高的光催化活性。本工作不仅为制备中空结构光催化剂提供了一条简单的途径，而且论证了硫源对金属硫化物光催化剂光催化性能的重要性。
(CuIn)0.2Zn1.6S2(CIZS) hollow sub-microspheres were prepared by a simple one-step hydrothermal method using thioacetamide (TAA) as a sulfur source. It was demonstrated that the amount of TAA played a key role on the morphology of CIZS samples. Low amount of TAA led to the formation of solid sub-microspheres. Nevertheless, high amount of TAA gave rise to the growth of hollow sub-microspheres, which could be elucidated by a bubble template mechanism. The morphology transition, as well as the reduced crystallite size, led to the increased specific surface area with the increased amount of TAA. Meanwhile, the defect states in CIZS samples were gradually decreased, when the amount of TAA was increased. The improved specific surface area and decreased defects of CIZS products contributed to higher efficiencies of charge separation and surface chemical reaction. The photocatalytic performance of CIZS photocatalysts was closely influenced by the amount of TAA. CIZS samples prepared with 5 g of TAA showed the highest hydrogen production rate, with the apparent quantum yield of 11.5% at 420 nm. It was summarized that the superior photocatalytic activity should be attributed to the larger specific surface area, decreased defects and relatively clean surface. This work not only provided a simple route to prepare hollow-structured photocatalysts, but also demonstrated the importance of sulfur source on photocatalytic properties of metal sulfide photocatalysts.