Facile synthesis and photoelectrochemical properties of novel TiN/C3N4/CdS nanotube core/shell arrays
Facile synthesis and photoelectrochemical properties of novel TiN/C3N4/CdS nanotube core/shell arrays
复制标题
新型TiN/C3N4/CdS纳米管核/壳阵列的简便合成及其光电化学性能
DOI：
10.1016/s1872-2067(19)63512-6
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发表时间：
2020-10-01
影响因子：
16.5
通讯作者：
Lin, Shiwei
中科院分区：
文献类型：
--
作者：
Ai, Changzhi;Tong, Li;Lin, Shiwei
近年来，g-C3N4基异质结由于能极大提高光生载流子的分离效率而得到了广泛的研究.然而，大多数的研究都是基于g-C3N4粉体.为了提高g-C3N4基异质结的光电催化性能，本文设计了一种新颖的具有核/壳结构的TiN/C3N4/CdS纳米管阵列.此结构中TiN纳米管阵列对模拟太阳光几乎没有响应，因此只是作为支撑g-C3N4/CdS异质结的优良导电纳米管阵列骨架.采用简单液相原子层沉积法制备的g-C3N4由于具有合适的能带位置，在此结构中主要作为电子传输和分离的受体.通过连续离子层吸附反应法制备的CdS量子点可以有效地吸收可见光，从而在此结构中主要起到增强光吸收的作用.近年来，g-C3N4基异质结由于能极大提高光生载流子的分离效率而得到了广泛的研究.与TiN/C3 N4纳米管阵列相比，TiN/C3 N4/CdS样品的光电化学性能有了很大的提高，这可以通过光电化学测试和光电化学催化降解来评价。特别是在模拟太阳光下，优化后的TiN/C3 N4/CdS在0 V偏压下的光电流密度比TiN/C3 N4提高了近120倍，这主要归因于其有效地扩大了光吸收范围和分离了电子-空穴对。(c)2020年，中国科学院大连化学物理研究所。Elsevier B. V.出版，保留所有权利。
Recently, the g-C3N4-based heterojunctions have been widely investigated for their greatly enhanced photogenerated carrier separation efficiency. However, most studies are based on the study of g-C3N4 powders. In this study, a novel TiN/C3N4/CdS nanotube arrays core/shell structure is designed to improve the photoelectrochemical catalytic performance of the g-C3N4-based heterojunctions. Among them, TiN nanotube arrays do not respond to simulated solar light, and thus only serve as an excellently conductive nanotube arrays backbone for supporting g-C3N4/CdS heterojunctions. g-C3N4 prepared by simple liquid atomic layer deposition, which possesses appropriate energy band position, mainly acts as the electron acceptor to transport and separate electrons. Deposited CdS quantum dots obtained by successive ionic layer adsorption reaction can effectively absorb visible light and thus act as a light absorber. The TiN/C3N4/CdS nanotube arrays core/shell structure could be verified by X-ray diffractions, Raman spectra, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy elemental mappings and X-ray photoelectron spectroscopy. Compared with TiN/C3N4 nanotube arrays, the TiN/C3N4/CdS samples greatly improve the photoelectrochemical performance, which can be evaluated by photoelectrochemical tests and photoelectrochemical catalytic degradation. Especially, the optimized photocurrent density of TiN/C3N4/CdS has almost 120 times improvement on TiN/C3N4 at 0 V bias under simulated sunlight, which can be ascribed to the effective expansion of the light absorption range and separation of electron-hole pairs. (c) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.