(Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China)
Converting solar energy into chemical energy through artificial photosynthesis represents one of the most promising approaches to address the global energy crisis and environmental issues. Recently, two-dimensional covalent organic frameworks (COFs) have emerged as a promising class of photocatalysts for water splitting, CO2 reduction and hydrogen peroxide production as they generally possess versatile chemical structures, high crystallinity, and rich surface active sites. In this report, we highlight recent progress in developing two-dimensional COFs for solar-to-chemical energy conversion with emphasis on the design and synthetic strategies and corresponding applications in photocatalytic reactions. Furthermore, future opportunities and challenges in the field of solar-to-energy conversion are also briefly discussed.