Li Fuxiang, Xiao Xudong, Zhao Chen, Liu Jianan, Li Qi, Guo Chuanyu, Tian Chungui, Zhang Liping, Hu Jiuan, Jiang Baojiang
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
J Colloid Interface Sci. 2020 Jul 15;572:22-30. doi: 10.1016/j.jcis.2020.03.071. Epub 2020 Mar 20.
Structural design, doping, and construction of heterojunctions are effective strategies for producing highly efficient photocatalytic materials. Herein, N-doped TiO was formed on hexagonal CN tube through in-situ hydrolysis of a Ti source on a supramolecular precursor, followed by thermal treatment. As a result, a double-shell microtube, CN@TiO heterostructure was fabricated. It was worth noting that the supramolecular precursor was prepared from melamine and cyanuric acid, which not only served as a template for the double-shell tubular structure, but also provided nitrogen for the doping of TiO. The photocatalytic efficiency of CN@TiO was investigated by conducting hydrogen production experiments. The hydrogen production rate of CN@TiO was measured to be 10.1 mmol h g, which is 4 times and 15 times that of CN and TiO, respectively. The improved photocatalytic activity of CN@TiO can be ascribed to (1) the tubular structure that provides a large number of reaction sites and enhances mass transport, (2) the heterojunction that is beneficial to charge separation, and (3) doping of TiO with nitrogen which extends its optical absorption range to visible light. This work demonstrates a facile method for synthesizing a highly efficient photocatalyst towards hydrogen evolution by modifying its structure and chemical composition as well as forming a heterojunction.
结构设计、掺杂以及异质结的构建是制备高效光催化材料的有效策略。在此，通过在超分子前驱体上原位水解钛源，随后进行热处理，在六方氮化碳管上形成了氮掺杂二氧化钛。结果，制备出了一种双层微管结构的CN@TiO异质结。值得注意的是，该超分子前驱体由三聚氰胺和氰尿酸制备而成，它不仅作为双层管状结构的模板，还为二氧化钛的掺杂提供了氮元素。通过进行产氢实验研究了CN@TiO的光催化效率。测得CN@TiO的产氢速率为10.1 mmol h⁻¹ g⁻¹，分别是氮化碳和二氧化钛的4倍和15倍。CN@TiO光催化活性的提高可归因于：（1）提供大量反应位点并增强传质的管状结构；（2）有利于电荷分离的异质结；（3）二氧化钛的氮掺杂将其光吸收范围扩展至可见光。这项工作展示了一种通过改变结构和化学成分以及形成异质结来合成高效析氢光催化剂的简便方法。
