Covalent coupling promoting charge transport of CdSeTe/UiO-66 for boosting photocatalytic CO2 reduction

• Published in: Chinese chemical letters Vol. 34; no. 6; pp. 107903 - 194
• Main Authors: Chen, Lisha, Tang, Qianqian, Wu, Shihao, Zhang, Longshuai, Feng, Lifang, Wang, Yuan, Xie, Yiling, Li, Yan, Zou, Jian-Ping, Luo, Sheng-Lian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2023; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle,Nanchang Hangkong University,Nanchang 330063,China; Key Laboratory of Poyang Lake Environment and Resource Utilization of Ministry of Education,School of Resources & Environment,Nanchang University,Nanchang 330031,China%Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle,Nanchang Hangkong University,Nanchang 330063,China%School of Chemistry & Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China%Key Laboratory of Poyang Lake Environment and Resource Utilization of Ministry of Education,School of Resources & Environment,Nanchang University,Nanchang 330031,China
• Subjects: CO2 reduction; Covalent coupling; MOFs; Photocatalytic; Quantum dots; Photocatalytic; MOFs; Covalent coupling; CO2 reduction; Quantum dots
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2022.107903

Quantum dots (QDs) based heterojunction is a candidate for the photocatalytic CO2 reduction, owing to the large extinction coefficient and easy modification of band structures. However, the van der Waals interaction causes the large charge resistance and strong recombination centers between QDs and host materials, which makes the poor photocatalytic performance. Herein, a covalent bonded CdSeTe QDs and NH2-UiO-66 heterojunction (NUC-x) is constructed through an acylamino (-CONH-). The results indicate that the acylamino between NH2-UiO-66 and CdSeTe QDs can serve as the transfer channels for the photogenerated charges and stabilize the QDs. The optimized NUC-1200 achieved a CO generation rate of 228.68 µmol/g, which is 13 and 4 times higher than that of NH2-UiO-66 and CdSeTe QDs, respectively. This work provides a new avenue for efficient and stable photocatalysis of QDs. The acylamino between CdSeTe QDs and NH2-UiO-66 can act as a bridge for electron transmission and the covalent bonding can significantly improve the stability of heterojunction photocatalysts. [Display omitted]