分会

第四十六分会：纳米材料的合成与组装

摘要

直接Z型光催化体系模拟光合作用的光生载流子传输方式，有效促进了光生载流子的分离，从而提升催化剂的光催化制氢性能。在本工作中，我们以WO3纳米棒（NRs）和四吡啶基锌卟啉单体分别为成核模板和组装单元，通过简单的酸碱中和胶束限域组装的方法实现了ZnTPyP组装体/WO3纳米棒异质纳米棒-棒结构(ZnTPyP/WO3)。ZnTPyP通过N-W配位在WO3纳米棒上实现了可控组装，ZnTPyP/WO3复合材料的光催化制氢速率表现出了高的结构依赖性。在以Pt为助催化剂时，ZnTPyP/WO3表现出了最佳的产氢速率（74.53 mmol g-1 h-1），是ZnTPyP自组装纳米棒的2.64倍。ZnTPyP/WO3光催化制氢效率的提高主要归因于WO3和ZnTPyP之间的直接Z型电子转移机制。本研究首次报道了使用卟啉组装纳米结构构建有机-无机Z型异质光催化剂的方法，为基于有机超分子有序聚集体材料制备新型高效光催化剂提供了有价值的信息。 The direct Z-scheme photocatalytic system can effectively improve the separation efficiency of photogenerated carriers through the photosynthesis-based photocarrier transport model. In this study, zinc porphyrin-assembled nanorods (ZnTPyP) and WO3 nanorods’ nanorod-on-nanorod heterojunctions (ZnTPyP/WO3) were successfully prepared through a simple modified acid–base neutralization micelleconfined assembly method using WO3 nanorods as the nucleation template and ZnTPyP as building blocks. ZnTPyP achieved a controllable assembly onto WO3 nanorods through N–W coordination. ZnTPyP/WO3 nanorod-on-nanorod heterojunctions exhibited a structure-dependent photocatalytic performance for hydrogen production. The ZnTPyP/WO3 nanorod-on-nanorod heterojunctions exhibited a optimal hydrogen production rate (74.53 mmol g−1 h−1) using Pt as the co-catalyst, which was 2.64 times that of the ZnTPyP self-assembled nanorods. The improvement in the photocatalytic hydrogen production efficiency could be mainly attributed to the direct Z-scheme electron-transfer mechanism from WO3 to ZnTPyP. This is the first report of an approach using porphyrin-assembled nanostructures to construct organic–inorganic Z-scheme photocatalysts. This study offers valuable information for preparing new efficient photocatalysts based on organic supramolecular orderly aggregate materials.

关键词

卟啉;可控共组装;直接Z型光催化体系;光催化制氢

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