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Engineering a highly dispersed co-catalyst on a few-layered catalyst for efficient photocatalytic H2 evolution: a case study of Ni(OH)2/HNb3O8 nanocomposites
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-10-05 00:00:00 , DOI: 10.1039/c7cy01792h Yuzhou Xia 1, 2, 3, 4 , Weihang Chen 2, 4, 5, 6 , Shijing Liang 1, 2, 3, 4, 5 , Jinhong Bi 1, 2, 3, 4, 5 , Ling Wu 1, 2, 3, 4 , Xuxu Wang 1, 2, 3, 4
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-10-05 00:00:00 , DOI: 10.1039/c7cy01792h Yuzhou Xia 1, 2, 3, 4 , Weihang Chen 2, 4, 5, 6 , Shijing Liang 1, 2, 3, 4, 5 , Jinhong Bi 1, 2, 3, 4, 5 , Ling Wu 1, 2, 3, 4 , Xuxu Wang 1, 2, 3, 4
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How to control the size and dispersity of co-catalysts and enhance the interaction between the catalyst and co-catalysts are open issues in catalysis. In this work, we have developed a novel approach to solve the aforementioned problems by utilizing the interlayered spatial steric inhibition effect of layered materials and the self-assembly of 2D nanosheets. A Ni(OH)2-modified few-layered HNb3O8 photocatalyst is taken as a typical example. SEM and TEM results show that the co-catalyst Ni(OH)2 with an ultrasmall size has been uniformly dispersed on the HNb3O8 layers through our method. However, the samples prepared by a traditional deposition method exhibit a heterogeneous Ni(OH)2 modification with a large size. That is, our method could provide a larger number of surface active sites. Furthermore, due to the confined interlayer region of the layered HNb3O8, a very strong interaction between Ni(OH)2 and HNb3O8 is achieved. As a result, the photogenerated charge carriers have been separated efficiently and the lifetime of the charge carrier is prolonged. Thus, the photocatalytic activities of our Ni(OH)2/HNb3O8 samples are greatly enhanced. The optimal H2 evolution rate of our sample is about 15.7 times higher than that of the sample prepared by a traditional co-catalyst modification method. This work highlights an efficient strategy for obtaining a highly dispersed co-catalyst, which might help to guide the way toward the development of highly efficient co-catalyst-modified photocatalyst systems.
中文翻译：
在几层催化剂上设计高度分散的助催化剂以有效地光催化H 2释放：Ni（OH）2 / HNb 3 O 8纳米复合材料的案例研究
如何控制助催化剂的尺寸和分散性以及增强催化剂与助催化剂之间的相互作用是催化领域的开放性问题。在这项工作中，我们已经开发出一种新颖的方法，通过利用层状材料的层间空间空间抑制作用和2D纳米片的自组装来解决上述问题。以Ni（OH）2改性的几层HNb 3 O 8光催化剂为典型实例。SEM和TEM结果表明，通过我们的方法，具有超小尺寸的助催化剂Ni（OH）2已经均匀地分散在HNb 3 O 8层上。然而，通过传统的沉积方法制备的样品表现出异质的Ni（OH）2大尺寸的修改。也就是说，我们的方法可以提供更多的表面活性部位。另外，由于层状的HNb 3 O 8的层间区域狭窄，因此Ni（OH） 2与HNb 3 O 8之间的相互作用非常强。结果，有效地分离了光生电荷载流子，并延长了电荷载流子的寿命。因此，我们的Ni（OH） 2 / HNb 3 O 8样品的光催化活性大大提高。最佳H 2我们样品的进化速率比传统助催化剂改性方法制备的样品高约15.7倍。这项工作强调了获得高度分散的助催化剂的有效策略，这可能有助于指导开发高效助催化剂改性的光催化剂体系的方法。
更新日期：2017-11-27
中文翻译：
在几层催化剂上设计高度分散的助催化剂以有效地光催化H 2释放：Ni（OH）2 / HNb 3 O 8纳米复合材料的案例研究
如何控制助催化剂的尺寸和分散性以及增强催化剂与助催化剂之间的相互作用是催化领域的开放性问题。在这项工作中，我们已经开发出一种新颖的方法，通过利用层状材料的层间空间空间抑制作用和2D纳米片的自组装来解决上述问题。以Ni（OH）2改性的几层HNb 3 O 8光催化剂为典型实例。SEM和TEM结果表明，通过我们的方法，具有超小尺寸的助催化剂Ni（OH）2已经均匀地分散在HNb 3 O 8层上。然而，通过传统的沉积方法制备的样品表现出异质的Ni（OH）2大尺寸的修改。也就是说，我们的方法可以提供更多的表面活性部位。另外，由于层状的HNb 3 O 8的层间区域狭窄，因此Ni（OH） 2与HNb 3 O 8之间的相互作用非常强。结果，有效地分离了光生电荷载流子，并延长了电荷载流子的寿命。因此，我们的Ni（OH） 2 / HNb 3 O 8样品的光催化活性大大提高。最佳H 2我们样品的进化速率比传统助催化剂改性方法制备的样品高约15.7倍。这项工作强调了获得高度分散的助催化剂的有效策略，这可能有助于指导开发高效助催化剂改性的光催化剂体系的方法。
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