Sodium-doped carbon nitride nanotubes for efficient visible light-driven hydrogen production

被引:0
作者
Longshuai Zhang
Ning Ding
Muneaki Hashimoto
Koudai Iwasaki
Noriyasu Chikamori
Kazuya Nakata
Yuzhuan Xu
Jiangjian Shi
Huijue Wu
Yanhong Luo
Dongmei Li
Akira Fujishima
Qingbo Meng
机构
[1] Chinese Academy of Sciences (CAS),Key Laboratory for Renewable Energy
[2] Beijing Key Laboratory for New Energy Materials and Devices,Photocatalysis International Research Center, Research Institute for Science and Technology
[3] Beijing National Laboratory for Condensed Matter Physics,School of Physical Sciences
[4] Institute of Physics,undefined
[5] CAS,undefined
[6] Tokyo University of Science,undefined
[7] University of Chinese Academy of Sciences,undefined
来源
Nano Research | 2018年 / 11卷
关键词
graphitic carbon nitrides; nanotubes; alkali metal doping; photocatalytic hydrogen production; hydrothermal/thermopolymerization processes; two-step synthesis;
D O I
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中图分类号
学科分类号
摘要
Sodium-doped carbon nitride nanotubes (Nax-CNNTs) were prepared by a green and simple two-step method and applied in photocatalytic water splitting for the first time. Transmission electron microscopy (TEM) element mapping and X-ray photoelectron spectroscopy (XPS) measurements confirm that sodium was successfully introduced in the carbon nitride nanotubes (CNNTs), and the intrinsic structure of graphitic carbon nitride (g-C3N4) was also maintained in the products. Moreover, the porous structure of the CNNTs leads to relatively large specific surface areas. Photocatalytic tests indicate that the porous tubular structure and Na+ doping can synergistically enhance the hydrogen evolution rate under visible light (λ > 420 nm) irradiation in the presence of sacrificial agents, leading to a hydrogen evolution rate as high as 143 μmol·h−1 (20 mg catalyst). Moreover, other alkali metal-doped CNNTs, such as Lix-CNNTs and Kx-CNNTs, were tested; both materials were found to enhance the hydrogen evolution rate, but to a lower extent compared with the Nax-CNNTs. This highlights the general applicability of the present method to prepare alkali metal-doped CNNTs; a preliminary mechanism for the photocatalytic hydrogen evolution reaction in the Nax-CNNTs is also proposed.
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页码:2295 / 2309
页数:14
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