Abstract
Imine-linked covalent triazine frameworks (CTFs) with high crystallinity and nano-morphologies are synthesized more easily compared to the CTFs with irreversible bonds. Nevertheless, their photocatalytic hydrogen evolution is usually less efficient due to the low utilization of photogenerated charge carriers. Herein, ultrathin Ti3C2Tx nanosheets with high conductivity and a good deal of terminal -O groups are employed to improve the photocatalytic hydrogen evolution of CTF-TFB through the fabrication of composites CTF-TFB/Ti3C2Tx (TM-x). And the broad-spectrum light absorption and photothermal effect of Ti3C2Tx nanosheets significantly enhance the utilization of visible light for CTF-TFB. Typically, Ti3C2Tx absorbing photogenerated electrons from CTF-TFB to achieve spatial separation of charge carriers, thereby TM-20 exhibiting an about 0.5-fold increase in AQYs at 420 nm and 450 nm compared to CTF-TFB. Meanwhile, the great photothermal effect of Ti3C2Tx brings a higher surface temperature for TM-20, leading to an additional 67 % increase in the photocatalytic hydrogen evolution rate of TM-20.
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