g-C 3 N 4 /TiO 2 Mesocrystals Composite for H 2 Evolution under Visible-Light Irradiation and Its Charge Carrier Dynamics.

The photocatalytic performance of graphitic carbon nitride (g-C3 N4 ) has been limited to low efficiency due to fast charge recombination. Here, we constructed g-C3 N4 nanosheets/TiO2 mesocrystals metal-free composite (g-C3 N4 NS/TMC) to promote the efficiency of charge separation. The photocatalytic H2 evolution experiments indicate that coupling g-C3 N4 NS with TMC increases photogenerated charge carriers in g-C3 N4 NS/TMC composite due to efficient charge separation. g-C3 N4 NS (31 wt %)/TMC shows the highest photocatalytic activity and the corresponding H2 evolution rate is 3.6 μ mol h-1 . This value is 20 times larger than that of g-C3 N4 NS without any noble metal cocatalyst under visible-light irradiation (λ > 420 nm). The photocatalytic activity of g-C3 N4 NS/TMC (3.6 μmol h-1 ) is 7 times higher than that of g-C3 N4 NS/P25 (0.5 μ mol h-1 ), confirming the importance of strong interface interaction between two-dimensional g-C3 N4 NS and plate-shape TMC. Femtosecond time-resolved diffuse reflectance (fs-TDR) was employed to study the fundamental photophysical processes of bulk g-C3 N4 , g-C3 N4 NS, and g-C3 N4 /TMC composite which are essential to explain the photocatalytic activity. Using fs-TDR, we demonstrate that the photocatalytic activity depends on the increased driving force for photoinduced electron transfer and a higher percentage of photogenerated charges.