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Developing semiconductor catalysts with high catalytic activity and good economic benefits is an important and challenging task in the field of photocatalysis. In this study, CdS nanosheets with a three-dimensional hollow structure were grown on MoS2 nanosheets by a hydrothermal method. The hydrogen production of the CdS@MoS2-25 wt% composites is 8.2 mmol in 3 h, which is 43.71 times that of pure CdS and 4.7 times that of Pt. Density functional theory (DFT) was used to further study the band structure of the composites. The experimental and calculation results show that the addition of co-catalyst MoS2 reduces the band gap of CdS and accelerates the transfer rate of photogenerated electrons. The construction of a n–n homogeneous structure reduces the interface transmission resistance of the carriers, and the photocatalytic performance of the composite material has been significantly improved. Therefore, the composite material is an excellent semiconductor photocatalyst that can replace precious metals in the reaction. In addition, after adding the promoter MoS2 to participate in the photocatalytic reaction for 12 h, the composite material still maintains high photocatalytic activity, and the recombination rate of photogenerated carriers is greatly reduced, which proves that the photocatalyst has good stability. [ABSTRACT FROM AUTHOR]

Herein, we presented a simple two-step hydrothermal method to fabricate noble-metal-free 3D net-like Ni 3 (VO 4) 2 ultrathin nanosheets coupled with the MoS 2 @CFC interface. Benefiting from the reciprocally binding structure and interfacial coupling effects between Ni 3 (VO 4) 2 nanosheet and MoS 2 @CFC, the catalytically active area was expanded, and the intrinsic activity toward HER was significantly improved. [Display omitted] • Ni 3 (VO 4) 2 with 3D net-like structure was constructed on the MoS 2 nanosheets. • The interface coupling structure was formed between MoS 2 and Ni 3 (VO 4) 2. • This work provides new perspectives to construct efficient electrocatalysts. The use of cheap and efficient electrocatalyst for the production of hydrogen is the key to solving the current energy crisis. Herein, we used a two-step hydrothermal process to fabricate noble-metal-free 3D net-like Ni 3 (VO 4) 2 ultrathin nanosheets coupled with MoS 2 @CFC interface. Unlike the traditional two-dimensional composite materials, Ni 3 (VO 4) 2 ultrathin nanosheets intersect with MoS 2 nanosheets grown on CFC in a 3D net-like structure (Ni 3 (VO 4) 2 /MoS 2 @CFC). Due to the mutual combination of structures and the interfacial coupling cooperation effect between Ni 3 (VO 4) 2 nanosheet and MoS 2 @CFC, the catalytically active area was expanded, and the intrinsic activity toward HER was significantly improved. Ni 3 (VO 4) 2 /MoS 2 @CFC showed high activity at the industrial temperature (75 °C), with an overpotential of 77 mV (10 mA/cm2) and a 65 mV/dec Tafel slope. This material showed good stability at 0.5 M H 2 SO 4. This work provides a heterostructure scheme for the construction of a novel noble metal-free electrocatalyst to promote hydrogen evolution reaction. [ABSTRACT FROM AUTHOR]

Uniformly lamellar MoS 2 nanoflowers have successfully grown on the surface of cornstalks with biocarbon based template. The as-formed biocarbon based composite materials (MoS 2 /C) were used in lithium-ion battery and supercapacitors. It showed outstanding electrochemical properties as anode materials in LIBs, the discharge capacity was 1129 mAh g−1 (or 339 mAh g−1) after 100 cycles at a current density of 0.1 A g−1 (or 1 A g−1). Furthermore, the composites possessed a high specific capacitance of 338.3 F g−1 and good cycling stability as negative electrode in supercapacitors. BET and XPS results confirmed the large specific surface areas and heterogeneous structures of the composite materials, which endowed them more active sites and excellent conductance properties conducive to improve the energy storage properties. So, biocarbon based template method and this composite material had great application prospects in the field of energy. Uniformly lamellar MoS 2 have successfully grown on the surface of cornstalks with biocarbon based template, which showed outstanding electrochemical properties in lithium-ion battery and supercapacitors. Image 1 • Lamellar MoS 2 nanoflowers have successfully and uniformly grown on the surface of cornstalks for the first time. • The composite materials had heterogeneous structure, which were conducive to improve the energy storage properties. • As anode material in LIBs and negative electrode in supercapacitors of MoS 2 /C all had excellent energy storage performance. [ABSTRACT FROM AUTHOR]