Research Progress of β-Ketoenamine-Linked Covalent Organic Frameworks for Photocatalytic Hydrogen Evolution

Abstract

β-ketoamide COFs, also named Tp-COFs, are considered to be a milestone material in the history of photocatalysts because of its excellent visible-light absorption, high crystallinity, ultra-high stability and structural diversity. In recent years, a large number of Tp-COFs and their composites were successfully constructed based on molecular or composite engineering strategies, and exhibited splendid photocatalytic water splitting activity. In comparison with composite strategy, molecular engineering technique effectively avoids interface problems by designing and preparing frameworks in the molecular level. Therefore, it is necessary to timely summarize the construction of Tp-COF photocatalysts based on molecular engineering strategy, so as to provide some theoretical basis and enlightenment for the subsequent development of high-performance Tp-COFs. Finally, the shortcomings and challenges of this technique and personal views on the further development of Tp-COFs are presented.