METHOD OF PRODUCING COMPOSITE MATERIAL BASED ON TITANIUM DIOXIDE NANOTUBES AND SPHERICAL NICKEL NANOPARTICLES Russian patent published in 2025 - IPC C01G23/47 C01G53/00 B82B3/00 C25D11/26 C25D3/12 B82Y30/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and nanotechnology and can be used in production of beta-voltaic and photocatalytic elements, magnetic devices, as well as catalysts for synthesis of chemical compounds. First, a nanotubular titanium dioxide matrix is synthesized in an electrochemical cell containing electrodes and an electrolyte consisting of ethylene glycol, ammonium fluoride and water. Anode is a titanium plate fixed on the thermostatic element, and the cathode is a steel plate. Then, primary anodizing is carried out by maintaining a constant voltage of 20–200 V on the electrodes. Oxide layer obtained as a result of primary anodizing is removed. Then, secondary anodizing is carried out under the same conditions. Obtained oxide layer is annealed at 400–450 °C. Spherical nickel nanoparticles are deposited on the synthesized matrix, the diameter of nanotubes of which ranges from 40 nm to 140 nm, in an electrochemical cell containing electrodes and an electrolyte which is an aqueous solution of nickel sulphate and chloride and boric acid. One electrode is a titanium plate with a previously obtained matrix of nanotubular titanium dioxide, which is fixed on a thermostatic element, and the second electrode is a nickel plate. Electrodes are connected to the terminals of the power supply and direct or alternating current is supplied to them for 10–30 minutes. In the case of direct current supply, its density is selected from range of 0.5–5 mA/cm². In case of AC supply, its frequency is selected from range of 100–750 Hz. Thermostating element used is a brass plate connected to the Peltier element, which allows maintaining the temperature of the electrode fixed on it in range of 20 °C to 25 °C. Obtained composite material based on titanium dioxide nanotubes and spherical nanoparticles has high photocatalytic activity and high resistance to degradation.

EFFECT: no noble metals are used when producing said composite material.

8 cl, 4 dwg