Unveiling Charge-Separation Dynamics in CdS/Metal–Organic Framework Composites for Enhanced Photocatalysis

作者：Hai-Qun Xu, Sizhuo Yang, Xing Ma, Jier Huang, Hai‐Long Jiang · 发表于：ACS Catalysis · 年份：2018 · DOI：10.1021/acscatal.8b03233 · 被引用次数：404 · 研究领域：Advanced Photocatalysis Techniques、Metal-Organic Frameworks: Synthesis and Applications、Covalent Organic Framework Applications

Photocatalytic water splitting for H 2 production becomes one of the most favorable pathways for solar energy utilization, while the charge-separation dynamics in composite photocatalysts is largely elusive. In the present work, CdS-decorated metal–organic framework (MOF) composites, namely, CdS/UiO-66, have been synthesized and exhibit high H 2 production activity from photocatalytic water splitting, far surpassing the MOF and CdS counterparts, under visible light irradiation. Transient absorption (TA) spectroscopy has been adopted in this report to unveil the charge-separation dynamics in CdS/UiO-66 composites, a key process that dictates their function in photocatalysis. We show that, in addition to the preferable formation of fine CdS particles assisted by the MOF, effective electron transfer, which occurs from excited CdS to UiO-66, significantly inhibits the recombination of photogenerated charge carriers, ultimately boosting the photocatalytic activity for H 2 generation. This report on charge-separation dynamics for CdS–MOF composites affords significant insights for future fabrication of advanced composite photocatalysts.