Hydro-/solvo-thermal Synthesis And Property Of MoS₂/TiO₂ Nanohybrid

MoS2 is one typical member of graphene-like transition metal dichalcogenides. It is widely applied in solid lubricant, industrial catalysts, hydrogen evolution and electrochemistry. In recent years, MoS2 with different morphologies have been developed by various methods, and its applications in many fields were explored. Since MoS2 was first used as anode material for lithium ion battery in 1980 s, the electrochemical performance of MoS2 with different morphologies has been investigated. It has been shown that the morphology, size and the state of stacking have a significant effect on the electrochemical performance of Mo S2. In this paper, we focused on synthesis of MoS2/TiO2 nanohybrids by hydrothermal or solvothermal methods, and explored its applications in photocatalysis and lithium ion batteries. In the first, three dimensional flower-like MoS2/TiO2 hybrid was synthesized by sulfurizing the precursor of MoO2/TiO2. In the second, the TiO2-decorated MoS2 layer was prepared by using one-step hydrothermal method followed by annealing process. At last, the MoS2/TiO2 particles were obtained by a two-phase solvothermal method. The electrochemical property as anode material and photocatalytic property of products have been investigated.Firstly, three dimensional flower-like MoS2/TiO2 hybrids have been prepared by a two-step hydrothermal method followed by post-annealing process. The first hydrothermal step is to synthesize the precursor of MoO2/TiO2, which is sulfurized by thiourea in the second hydrothermal process. The electrochemical tests showed that MoS2/TiO2(4:1) exhibited better cycling durability and rate behavior. When the current density is 100 mA g-1, the reversible capacity of the MoS2/TiO2(4:1) remained 802.1 mAh g-1 after 50 cycles. We also carried out the photocatalytic performance of as-prepared products by degradation of the methyl orange(MO). The experimental results showed that MoS2/TiO2(4:1) was superior to the others. And it showed an enhanced photocatalytic performance with 97.7% degradation of MO within 110 min under UV light irradiation.Secondly, the TiO2-decorated MoS2 nanosheets synthesized by using ammonium molybdate as Mo resource and the ethyl alcohol solution of TiCl4 as Ti resource, CS(NH2)2 as S resource. The electrochemical tests showed that MoS2/TiO2(4:1) exhibited better cycling durability and rate behavior. When the current density is 100 mA g-1, the reversible capacity of the MoS2/TiO2(4:1) remained 793.3 mAh g-1 after 50 cycles. We also carried out the photocatalytic performance of as-prepared products by degradation of the MO. The experimental results showed that MoS2/TiO2(4:1) was superior to the others. And it showed an enhanced photocatalytic performance with 73.9% degradation of MO within 110 min under UV light irradiation.At last, the MoS2/TiO2 nanoparticles were synthesized by a two-phase solvothermal hydrothermal method followed by post-annealing using ammonium molybdate as Mo resource and the oleylamine as surfactant. The electrochemical tests showed that MoS2/TiO2(4:1) exhibited better cycling durability and rate behavior. When the current density is 100 mA g-1, the reversible capacity of the MoS2/TiO2(4:1) remained 593.9 mAh g-1 after 50 cycles. We also carried out the photocatalytic performance of as-prepared products by degradation of the MO. The experimental results showed that MoS2/TiO2(1:1) was superior to the others. And it showed an enhanced photocatalytic performance with 61.2% degradation of MO within 110 min under UV light irradiation.