Wang Dengke, Zeng Hui, Xiong Xin, Wu Mei-Feng, Xia Meirong, Xie Maoliang, Zou Jian-Ping, Luo Sheng-Lian
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China.
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China.
Sci Bull (Beijing). 2020 Jan 30;65(2):113-122. doi: 10.1016/j.scib.2019.10.015. Epub 2019 Oct 17.
A facile and effective impregnation combined with photo-deposition approach was adopted to deposit cadmium sulfide (CdS) nanoparticles on CTF-1, a covalent triazine-based frameworks (CTFs). In this system, CTF-1 not only acted as supporter but also served as photocatalyst and electron donor. The performance of the obtained CdS deposited CTF-1 (CdS-CTF-1) nanocomposite was evaluated by H evolution reaction under visible light irradiation. As a result, CdS-CTF-1 exhibited high H production from water, far surpassing the CdS/CTF-1 nanocomposite, in which CdS was deposited via solvothermal method. The high activity of CdS-CTF-1 was attributed to the confined CdS nanoparticles with small size, leading to expose more active sites. In addition, time-resolved spectroscopy indicated that the superior performance of CdS-CTF-1 also can be ascribed to the fast electron transfer rate and injection efficiency (K = 0.18 × 10 s, η = 39.38%) between CdS and CTF-1 layers, which are 3.83 times faster and 4.84 times higher than that of CdS/CTF-1 nanocomposite. This work represents the first example on using covalent organic frameworks (COFs) as a support and electron-donor for fabricating novel CdS-COF nanocomposite system and its potential application in solar energy transformations.
采用一种简便有效的浸渍结合光沉积方法，将硫化镉（CdS）纳米颗粒沉积在共价三嗪基框架（CTF）之一的CTF-1上。在该体系中，CTF-1不仅作为载体，还作为光催化剂和电子供体。通过在可见光照射下的析氢反应评估所得CdS沉积的CTF-1（CdS-CTF-1）纳米复合材料的性能。结果表明，CdS-CTF-1表现出从水中高效产氢的能力，远远超过通过溶剂热法沉积CdS的CdS/CTF-1纳米复合材料。CdS-CTF-1的高活性归因于尺寸较小的受限CdS纳米颗粒，从而暴露出更多活性位点。此外，时间分辨光谱表明，CdS-CTF-1的优异性能还可归因于CdS与CTF-1层之间快速的电子转移速率和注入效率（K = 0.18×10 s，η = 39.38%），分别比CdS/CTF-1纳米复合材料快3.83倍和高4.84倍。这项工作代表了首次使用共价有机框架（COF）作为载体和电子供体来制备新型CdS-COF纳米复合体系及其在太阳能转换中的潜在应用的实例。
