CVD Grown Sub 10 nm Size g-C3N4 Particle-Decorated TiO2 Nanotube Array Composites for Enhanced Photocatalytic H2 Production.

IF 5.7 Q2 CHEMISTRY, PHYSICAL
ACS Materials Au Pub Date : 2024-12-09 eCollection Date: 2025-03-12 DOI:10.1021/acsmaterialsau.4c00084
Kosei Ito, Sho Yoneyama, Shusuke Yoneyama, Paul Fons, Kei Noda
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引用次数: 0

Abstract

TiO2 nanotube arrays (NTA) have attracted much attention among photocatalysts because of their large specific surface area and easy surface transfer of excited electrons, and in recent years, attempts have been made to further improve their properties by forming Z-schemes when they are composited with other photocatalysts. However, as the spacing within and between nanotubes is only a few nanometers, the formation of heterojunctions is extremely difficult when TiO2-NTA is composited with other photocatalytic materials with larger grain sizes. Creating nanoparticle photocatalysts with dimensions smaller than those of the nanotube system is thus required to effectively form heterojunctions. We have constructed an original vacuum chemical vapor deposition (CVD) system with fine temperature control, an attribute that we believe is necessary for the preparation of small nanoparticles. Using this system, it is possible to greatly reduce the polymerization rate of melamine, the precursor of the carbon nitride (g-C3N4) photocatalyst, which offers the benefits of increased reduction power and a metal-free composition. As a result, g-C3N4 small nanoparticles with particle sizes of about 10 nm were successfully prepared, and heterojunctions could be formed even inside TiO2-NTA. The fabricated TiO2-NTA/g-C3N4 composite structure exhibited significantly improved redox power and photocatalytic hydrogen production compared to TiO2-NTA and g-C3N4 alone. In addition, while the hydrogen production rates for TiO2-NTA and g-C3N4 were almost constant, TiO2-NTA/g-C3N4 showed a rapid increase in the hydrogen production rate after a certain period of light irradiation, which was presumably caused by oxygen desorption from g-C3N4. The results of this study provide a method for supporting small nanoparticle materials on nanotube substrates and their importance in improving photocatalytic properties, and will also make a significant contribution not only to the field of photocatalysis but also to other fields requiring small nanoparticle materials.

CVD生长10 nm以下尺寸的g-C3N4颗粒修饰TiO2纳米管阵列复合材料增强光催化制氢
二氧化钛纳米管阵列(NTA)因其比表面积大、激发电子易于表面转移而在光催化剂中备受关注,近年来,人们试图通过将其与其他光催化剂复合形成 Z 型结构来进一步改善其性能。然而,由于纳米管内部和之间的间距只有几纳米,当 TiO2-NTA 与其他粒度较大的光催化材料复合时,异质结的形成极为困难。因此,要想有效地形成异质结,就必须创造出尺寸小于纳米管系统尺寸的纳米颗粒光催化剂。我们构建了一个具有微温控制功能的独创真空化学气相沉积(CVD)系统,我们认为这是制备小型纳米粒子的必要条件。利用这种系统,可以大大降低氮化碳(g-C3N4)光催化剂的前体三聚氰胺的聚合速率,从而提高还原能力并获得无金属成分的优点。因此,成功制备出了粒径约为 10 纳米的 g-C3N4 小纳米颗粒,甚至在 TiO2-NTA 内部也能形成异质结。与单独使用 TiO2-NTA 和 g-C3N4 相比,所制备的 TiO2-NTA/g-C3N4 复合结构的氧化还原能力和光催化产氢能力都有显著提高。此外,TiO2-NTA 和 g-C3N4 的产氢率几乎恒定,而 TiO2-NTA/g-C3N4 的产氢率在光照射一段时间后迅速增加,这可能是由于 g-C3N4 中的氧气解吸所致。该研究结果提供了一种在纳米管基底上支持小纳米颗粒材料的方法,以及它们在提高光催化性能方面的重要性,不仅对光催化领域,而且对其他需要小纳米颗粒材料的领域也将做出重要贡献。
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来源期刊
ACS Materials Au
ACS Materials Au 材料科学-
CiteScore
5.00
自引率
0.00%
发文量
0
期刊介绍: ACS Materials Au is an open access journal publishing letters articles reviews and perspectives describing high-quality research at the forefront of fundamental and applied research and at the interface between materials and other disciplines such as chemistry engineering and biology. Papers that showcase multidisciplinary and innovative materials research addressing global challenges are especially welcome. Areas of interest include but are not limited to:Design synthesis characterization and evaluation of forefront and emerging materialsUnderstanding structure property performance relationships and their underlying mechanismsDevelopment of materials for energy environmental biomedical electronic and catalytic applications
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