Dramatic enhancement of photocatalytic H2 evolution over hydrolyzed MOF-5 coupled Zn0.2Cd0.8S heterojunction

Lifeng Cui; Xuhui Zou; Yanan Liu; Xi Li; Lingchang Jiang; Chengyun Li; Liuqing Yang; Mengjie Yu; Yangang Wang

doi:10.1016/j.jcis.2020.05.023

Dramatic enhancement of photocatalytic H₂ evolution over hydrolyzed MOF-5 coupled Zn_0.2Cd_0.8S heterojunction

J Colloid Interface Sci. 2020 Oct 1:577:233-241. doi: 10.1016/j.jcis.2020.05.023. Epub 2020 May 23.

Authors

Lifeng Cui¹, Xuhui Zou², Yanan Liu³, Xi Li⁴, Lingchang Jiang⁴, Chengyun Li¹, Liuqing Yang⁴, Mengjie Yu⁴, Yangang Wang⁵

Affiliations

¹ Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
² Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
³ College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China. Electronic address: yananliu@zjxu.edu.cn.
⁴ College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
⁵ College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China. Electronic address: ygwang8136@mail.zjxu.edu.cn.

PMID: 32485407
DOI: 10.1016/j.jcis.2020.05.023

Abstract

MOF-5 has been criticized for its poor water stability, which results in complete damage of its traditional functionality. Therefore, there are very few researches about the further application of hydrolyzed MOF-5 (h-M). However, in this work, the h-M can function as both superior support and semiconductor for photocatalytic reaction after a water-based process. Herein, a rational design of Zn_0.2Cd_0.8S@h-MOF-5 (ZCS@h-M) heterojunction photocatalyst has been synthesized via a hydrothermal method with different mass ratio of ZCS. As demonstrated in the results of SEM and TEM, during the hydrothermal process, MOF-5 exfoliated into two-dimensional small sheets and ZCS nanoparticles embedded into h-M frameworks, which is in favor for the dispersion of ZCS and better interface connection, thus further boosts the migration of photogenerated charge carriers and protect the photocorrosion of ZCS, ultimately improves the photocatalytic hydrogen production. Optimal ZCS content of 10 wt% exhibited a significantly enhanced visible light photocatalytic hydrogen production efficiency of 15.08 mmol h^-1 g^-1, which far surpassed bare ZCS at 7.62 times. Furthermore, the ZCS@h-M showed outstanding stability during photocatalytic hydrogen production over a number of cycles.

Keywords: Anti-photocorrosion; Hydrolyzed MOF-5; Photocatalytic hydrogen evolution; Visible light; Zn(0.2)Cd(0.8)S@h-MOF-5.