化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (1) : 72-75.

新材料与新技术

超薄碳涂层TiO₂纳米棒的制备及光解水制氢性能研究

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Preparation of ultrathin carbon-coated TiO₂ nanorods and the photocatalytic water splitting H₂ production

Liu Li, Yang Yurong, Qiu Min, Zhang Xiuping, Mu Yannan, Bai Yu

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Received		Published
2018-08-15		2020-01-20
Issue Date	Revised Date
2020-02-11	2018-08-15

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摘要

采用有机复合技术和热处理技术制备了超薄碳涂层TiO₂纳米棒。通过X射线衍射仪、激光拉曼光谱仪、高分辨率透射电子显微镜、紫外-可见分光光度计、荧光光谱仪和光解水制氢系统研究了不同层数的碳包覆一维TiO₂纳米棒的结构和光解水制氢性能。通过对碳层数的有效调控,实现TiO₂/C纳米棒的光催化效率和光吸收效率的最佳结合,获得高效的光解水制氢效率。结果表明:经过碳涂层后,TiO₂纳米棒光吸收能力增强,最大吸收边由紫外光区红移至可见光区。其中,用2层碳修饰的TiO₂纳米棒的光生载流子的分离和传输效率最高,其光解水制氢速率达1896μmol/(h·g),并且能够保持稳定的光催化活性,经过20h的循环反应,TiO₂纳米棒的产氢速率保持不变。

Abstract

Ultrathin carbon coated TiO₂ nanorods were prepared by organic composite technology and heat treatment technique.The structure and the photocatalytic H₂ production performance of one-dimensional TiO₂ nanorods with different carbon layers were studied by X-ray diffractometer,laser Raman spectrometer,high-resolution transmission electron microscope,ultraviolet-visible spectrophotometer,fluorescence spectrometer and photocatalytic water splitting systems for H₂ production.Through the effective regulation of the number of carbon layers,the optimal combination of photocatalytic efficiency and light absorption efficiency of the TiO₂/C nanorods was achieved,and efficient photocatalytic H₂ production efficiency was obtained.The result shown that the light absorption of the TiO₂ nanorods was enhanced after coated with carbon layers,and the maximum absorption edge shifted from the ultraviolet region to the visible region.The separation and transport efficiency of photo-generated carriers in the two-layer carbon-modified TiO₂ nanorods was the highest in all samples,the corresponding H₂ production rate was up to 1896μmol/(h·g).And it can maintained stable photocatalytic activity.After a 20h cycle reaction,the H₂ production rate of the nanorods remained unchanged.

关键词

TiO₂纳米棒 / 碳层 / 光生载流子 / 光解水制氢

Key words

TiO₂ nanorod / carbon layer / photo-generated carrier / photocatalytic water splitting for H₂

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超薄碳涂层TiO₂纳米棒的制备及光解水制氢性能研究[J]. 化工新型材料, 2020, 48(1): 72-75 DOI:

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