Efficient Visible-Light-Driven Photocatalytic Hydrogen Generation over 2D/2D Co-ZIF-9/Ti 3 C 2 Hybrids.

Exploring precious-metal-free catalysts for efficient photocatalytic H 2 evolution is highly desirable but still challenging. Herein, a novel 2D/2D Co-ZIF-9/Ti 3 C 2 composite was fabricated by a facile electrostatic self-assembly strategy. Owing to higher flux of photogenerated electron-holes and lower rate of recombination, the resultant composite exhibited better photocatalytic H 2 evolution compared to Co-ZIF-9. When the content of Ti 3 C 2 was 2.5 wt %, a maximum photocatalytic H 2 -generation rate of 3538.5 μmol g -1  ⋅ h -1 was achieved, which is 9.6 times that of bare Co-ZIF-9. Moreover, the Co-ZIF-9/Ti 3 C 2 composite displayed high photocatalytic stability. This study demonstrated for the first time the great potential of Co-ZIF-9/Ti 3 C 2 as a noble-metal-free catalyst for photocatalytic H 2 generation.