Facile Synthesis of MoS2 Modified TiO2 Nanospheres with Enhanced Photoelectrocatalytic activity

MoS 2 /TiO 2 nanocomposites composed of MoS 2 nanosheets and TiO 2 nanospheres have been successfully prepared by a facile hydrothermal process.The as-prepared MoS 2 /TiO 2 samples with different MoS 2 content have been characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM).The results show TiO 2 nanospheres with uniform size can improve the dispersion and decrease the aggregation of MoS 2 nanosheets.The best morphology and size of MoS 2 /TiO 2 nanocomposites can be obtained when the content of MoS 2 is 70 wt% (M-7).UV-vis data show that MoS 2 /TiO 2 samples have better absorption in visible light region compared to pure MoS 2 and TiO 2 .The photoelectrocatalytic activity of MoS 2 /TiO 2 samples has been evaluated by the photocurrent measurement.The results show that MoS 2 /TiO 2 nanocomposites with MoS 2 content of 70 wt% (M-7) have the highest photocurrent which implies best photoelectrocatalytic activity of M-7.The reason may be that the suitable content of MoS 2 and the tight junction between MoS 2 and TiO 2 nanosphers is helpful for preventing the recombination of photogenerated electrons and holes.