Abstract
The photocatalytic efficiency is greatly limited due to the narrow light response range and the low charge separation of MoS2. The 1 T @ 2 H phase MoS2 nanoflowers with controllable fabrication of defect levels were successfully prepared with excellent full-spectrum response by controlling various amounts of excesses thiourea as a sulfur source. Meanwhile, the 1 T @ 2 H MoS2-S4 sample with the optimal S defect level showed excellent photocatalytic degradation activity under UV-Vis and NIR light, with a degradation rate of 95.0% and 99.1% respectively. The EDS, EPR and UV-Vis-NIR absorption results show that the S defects has a significant effect on expanding the light absorption response range and enhancing the light absorption capacity. Compared with 1 T @ 2 H MoS2, the light absorption capacity of 1 T @ 2 H MoS2-S4 increased by 2.2 times due to the introduction of S vacancy. Ulteriorly, the introduction of 1 T phase has an excellent optimization effect on the photogenerated charge transmission path due to its own higher electron concentration and conductivity. Therefore, defect engineering and phase engineering are of great significance to the investigate of full-spectrum photocatalytic materials.
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