Photocatalytic CO2 reduction to syngas using metallosalen covalent organic frameworks
Wei Zhou, Xiao Wang, Wenling Zhao, Naijia Lu, Die Cong, Zhen Li, Peigeng Han, Guoqing Ren, Lei Sun, Chengcheng Liu, Wei Deng
Abstract
Abstract Metallosalen-covalent organic frameworks have recently gained attention in photocatalysis. However, their use in CO 2 photoreduction is yet to be reported. Moreover, facile preparation of metallosalen-covalent organic frameworks with good crystallinity remains considerably challenging. Herein, we report a series of metallosalen-covalent organic frameworks produced via a one-step synthesis strategy that does not require vacuum evacuation. Metallosalen-covalent organic frameworks possessing controllable coordination environments of mononuclear and binuclear metal sites are obtained and act as photocatalysts for tunable syngas production from CO 2 . Metallosalen-covalent organic frameworks obtained via one-step synthesis exhibit higher crystallinity and catalytic activities than those obtained from two-step synthesis. The optimal framework material containing cobalt and triazine achieves a syngas production rate of 19.7 mmol g −1 h −1 (11:8 H 2 /CO), outperforming previously reported porous crystalline materials. This study provides a facile strategy for producing metallosalen-covalent organic frameworks of high quality and can accelerate their exploration in various applications.