Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Department of Chemistry, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
Shenzhen HUASUAN Technology Co., Ltd, Shenzhen, 518055, P. R. China.
Chem Commun (Camb). 2023 Jun 27;59(52):8131-8134. doi: 10.1039/d3cc01322g.
In this paper, a series of micro-nano reactors assembled by N doped carbon coated TiO heterojunction nanosheets with different thickness, named TiO/N-C hollow framework (HF), TiO/N-C hollow hexahedron assembled by nanosheets (HHS), and TiO/N-C hollow hexahedron assembled by ultrathin nanosheets (HHUS), have been prepared by adjusting the alcoholysis rate of NH-MIL-125 and then pyrolysis. Experimental and theoretical studies revealed that with the decrease of the thickness of the heterojunction nanosheet subunit, more low-coordination Ti atoms would be exposed as effective sites for photocatalytic H evolution, and the interaction between the carbon layer and TiO would also be enhanced, which provided a smooth migration path for the effective separation of photogenerated carriers. Thus, TiO/N-C HHUS with the thinnest nanosheet subunit exhibited the best photoelectric performance and the highest photocatalytic hydrogen production activity.
本文通过调控 NH-MIL-125 的醇解速率，然后进行热解，制备了一系列不同厚度的 N 掺杂碳包覆 TiO 异质结纳米片组装的微纳反应器，分别命名为 TiO/N-C 空心框架（HF）、纳米片组装的 TiO/N-C 空心六面体（HHS）和超薄纳米片组装的 TiO/N-C 空心六面体（HHUS）。实验和理论研究表明，随着异质结纳米片亚单位厚度的减小，更多低配位 Ti 原子暴露出来，成为光催化 H2 析出的有效位点，并且碳层与 TiO 之间的相互作用也得到增强，这为光生载流子的有效分离提供了一个平滑的迁移路径。因此，具有最薄纳米片亚单位的 TiO/N-C HHUS 表现出最佳的光电性能和最高的光催化产氢活性。
