Ti<sup>4+</sup> Ions-Doped Metal–Organic Framework (MOF-74) for Photoreduction of Carbon Dioxide
Zhu Ding, Xicheng Tang, Dandan Zhao, Sai Yan, Luyan Li, Peng Li, Wei Tang, Suyun Zhang, Y. J. Zeng
Abstract
The development of efficient and sustainable methods for reducing carbon dioxide (CO 2 ) and converting it into valuable hydrocarbons has gained significant attention. In this study, researchers focused on Ti 4+ -doped metal–organic framework (MOF-74) photocatalysts. The incorporation of Ti 4+ ions into the MOF-74 structure was achieved through a one-pot hydrothermal method. By replacing Zn 2+ ions with Ti 4+ ions in a substitutional manner, researchers have aimed to enhance the photocatalytic activity of the CO 2 reduction. The obtained Ti 4+ -doped MOF-74 photocatalysts exhibited a significantly improved performance in the reduction of CO 2 into carbon monoxide (CO). The doping of Ti 4+ ions induced energy bands below the conduction band minimum (CBM) of MOF-74, extending the visible response range and enabling the photocatalysts to utilize a broader spectrum of light for catalytic reactions. This extension of the visible response range enables photocatalysts to utilize a broader spectrum of light for catalytic reactions. The incorporation of Ti 4+ ions not only extends the visible response range but also suppresses charge carrier recombination. This work provides valuable insights into the design principles of MOF-based photocatalysts and paves the way for their practical implementation in addressing the energy crisis and reducing greenhouse gas emissions.