Highly efficient charge transfer in CdS-covalent organic framework nanocomposites for stable photocatalytic hydrogen evolution under visible light

Dengke Wang; Hui Zeng; Xin Xiong; Mei-Feng Wu; Meirong Xia; Maoliang Xie; Jian-Ping Zou; Sheng-Lian Luo

doi:10.1016/j.scib.2019.10.015

Highly efficient charge transfer in CdS-covalent organic framework nanocomposites for stable photocatalytic hydrogen evolution under visible light

Sci Bull (Beijing). 2020 Jan 30;65(2):113-122. doi: 10.1016/j.scib.2019.10.015. Epub 2019 Oct 17.

Authors

Dengke Wang¹, Hui Zeng¹, Xin Xiong¹, Mei-Feng Wu¹, Meirong Xia¹, Maoliang Xie¹, Jian-Ping Zou², Sheng-Lian Luo³

Affiliations

¹ Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China.
² Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China. Electronic address: zjp_112@126.com.
³ Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China. Electronic address: sllou@hnu.edu.cn.

PMID: 36659074
DOI: 10.1016/j.scib.2019.10.015

Abstract

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 H₂ evolution reaction under visible light irradiation. As a result, CdS-CTF-1 exhibited high H₂ 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_ET = 0.18 × 10⁹ s^-1, η_inj = 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.

Keywords: CdS nanoparticles; Charge transfer dynamics; Covalent organic frameworks; Hydrogen generation; Photo-deposition.