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This invention discloses a CuBDC nanosheet, its preparation method, and its applications. The CuBDC nanosheet is a single-layer two-dimensional CuBDC nanosheet material; the aspect ratio of the CuBDC nanosheet is 80–400. The CuBDC nanosheet is single-layered, possessing a high aspect ratio and a large specific surface area. The preparation method is simple, the material is inexpensive and readily available, resulting in low cost and ease of mass production. The CuBDC nanosheet is suitable for gas storage, adsorption separation, heterogeneous catalysis, electrochemistry, and analytical applications.

The application discloses a vanadium pentoxide-based magnesium battery positive electrode material and a preparation method thereof. The application obtains flower-spherical vanadium pentoxide through a hydrothermal reaction of an ammonium metavanadate and a mixed solution of reactants and subsequent calcination; the method has high production efficiency, is convenient to produce, has short preparation time, is low in cost and has good repeatability. The flower-spherical vanadium pentoxide nanomaterial is used as a magnesium battery positive electrode material, more surface active sites can be exposed, ion transmission channels are increased, the problem of stacking and agglomeration of vanadium pentoxide nanosheets in a cycle process is solved, the exposed (001) crystal face reduces the interface side reaction of an electrode and an electrolyte surface, the storage capacity of vanadium pentoxide is greatly improved, the vanadium pentoxide has good cycle stability and is an excellent magnesium battery positive electrode material.

The application belongs to the field of catalytic materials, and specifically discloses a preparation method of a nano high-entropy alloy material and application of the material in oxygen electrocatalysis. The preparation method is as follows: a multi-metal organic complex, a reactive metal and a molten salt are mixed and calcined, and then subjected to simple water washing treatment and alkali washing modification treatment to obtain the nano high-entropy alloy material; the multi-metal organic complex is a complex formed by a metal M source and an organic complexing agent, and the metal M contains five or more than five kinds of Fe, Co, Ni, Cr, Mn, Cu, V, Mo, Ti, Au, Ag, Pt, Pd, Ru, Ir and Rh. The application also includes the material prepared by the preparation method and application of the material in OER / ORR catalysis. The material prepared by the method has excellent OER / ORR catalytic activity and stability.

The application discloses a TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst and a preparation method and application thereof, and relates to the field of photocatalytic materials. The TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst comprises a TiO2 inner core, and a ZnIn2S4 outer shell coated outside the TiO2 inner core; the ZnIn2S4 outer shell is formed by in-situ growth of ZnIn2S4 nanosheets on the surface of the TiO2 inner core to form a three-dimensional hierarchical nanoflower structure; wherein, an S-type heterojunction is formed between the TiO2 and the ZnIn2S4. The photocatalyst realizes efficient spatial separation of photo-generated carriers through a close heterojunction interface of the core-shell structure, and meanwhile, the S-type heterojunction retains the carriers with strong oxidation-reduction capacity, so that the performance of water decomposition for hydrogen production by photocatalysis and the cycle stability are improved.

A biomimetic silicification-enhanced catalyst and its preparation method are disclosed. The preparation method includes the following steps: S1: Urea, iron salt, and copper salt are added to a first solvent to obtain a mixed solution; S2: The mixed solution undergoes a hydrothermal reflux reaction to obtain particle units; S3: The particle units undergo a silicification reaction with ammonia and a silica precursor to obtain a catalyst. The catalyst prepared by this method can not only reduce its band gap by copper doping to utilize visible light as a reaction light source and reduce reaction conditions, but also inhibit the aggregation of catalyst particles by utilizing the mesoporous silica layer on the surface, expose more reaction sites, and limit the heat loss of the internal particle units, thereby increasing the reaction temperature. This can effectively improve the organic matter treatment effect of the catalyst. It adsorbs and degrades dyes in wastewater through two modes: electrostatic attraction and catalytic decomposition of hydrogen peroxide to generate strong oxidizing free radicals.