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All-solid-state Z-type heterostructure photocatalyst synthesized in situ, preparation method of all-solid-state Z-type heterostructure photocatalyst and application in photoelectrocatalytic synthesis of H2O2

A photoelectric catalysis, 2h-mose2 technology, applied in electrodes, electrolysis components, electrolysis processes, etc., can solve the problems of poor separation ability of photogenerated electrons and holes, easy recombination of electrons and holes in the body, and limited to ultraviolet light, etc. The preparation method is simple, is beneficial to the realization of industrialization, and has the effects of broad practical prospects

Active Publication Date: 2021-06-29
HAINAN UNICAN SCI & TECH INNOVATION INST CO LTD
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Problems solved by technology

However, TiO 2 Photocatalytic preparation of H 2 o 2 This can be attributed to the following three main reasons: 1) the absorption spectrum is limited to the ultraviolet (UV) region due to the inherent wide bandgap (about 3.2 eV); 2) the poor separation ability of photogenerated electrons and holes , and electrons and holes are easily recombined in vivo; 3) decompose TiO by forming peroxide (Ti-OOH) under light 2 H adsorbed on the surface 2 o 2

Method used

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  • All-solid-state Z-type heterostructure photocatalyst synthesized in situ, preparation method of all-solid-state Z-type heterostructure photocatalyst and application in photoelectrocatalytic synthesis of H2O2
  • All-solid-state Z-type heterostructure photocatalyst synthesized in situ, preparation method of all-solid-state Z-type heterostructure photocatalyst and application in photoelectrocatalytic synthesis of H2O2
  • All-solid-state Z-type heterostructure photocatalyst synthesized in situ, preparation method of all-solid-state Z-type heterostructure photocatalyst and application in photoelectrocatalytic synthesis of H2O2

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preparation example Construction

[0083] The invention provides a 1T / 2H-MoSe 2 @TiO 2 The preparation method of nanocomposite material, comprises the following steps:

[0084] 1) Place the conductive substrate on TiO 2 The hydrothermal reaction is carried out in the precursor solution, and after annealing treatment, TiO 2 Nano stave;

[0085] 2) After mixing the selenium powder solution and the molybdate solution, the precursor solution is obtained, and then the TiO obtained in the above steps is 2 The nanorods were placed in the precursor solution for hydrothermal reaction again, and after annealing treatment again, the intermediate product 2H-MoSe was obtained 2 @TiO 2 ;

[0086] 3) In an atmosphere containing ammonia, continue annealing the intermediate product obtained in the above steps to obtain 1T / 2H-MoSe 2 @TiO 2 nanocomposites.

[0087] The present invention first places the conductive substrate on TiO 2 The hydrothermal reaction is carried out in the precursor solution, and after annealing ...

Embodiment

[0139] (1) Preparation of TiO by hydrothermal method 2 Material:

[0140] The FTO substrate needs to be cleaned by ultrasonic cleaning in acetone, ethanol, and deionized water for 10 min in sequence. Preparation of TiO 2 Transfer the precursor solution into a high-pressure reaction kettle with a polytetrafluoroethylene liner, and then place the cleaned FTO on the polytetrafluoroethylene liner, with the conductive surface leaning downward at a certain angle lining. After tightening the reactor, place it in a blast drying oven and react at 150°C for 15-24 hours. After natural cooling, the prepared samples were taken out and cleaned with deionized water and ethanol in turn, then placed in a vacuum drying oven to dry for 12 hours, and finally placed in a muffle furnace and annealed in an air atmosphere at 450°C to obtain the rutile phase TiO 2 , the heating rate is 2°C / min.

[0141] where TiO 2 The precursor solution was prepared with tetrabutyl titanate, hydrochloric acid ...

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Abstract

The invention provides a 1T / 2H-MoSe2 (at) TiO2 nano composite material. The 1T / 2H-MoSe2 (at) TiO2 nano composite material comprises a TiO2 nano rod and MoSe2 nano particles compounded on the TiO2 nano rod, the MoSe2 nano particles comprise a mixed phase MoSe2 nano particle; and the mixed phase includes a 1T metal phase and a 2H semiconductor phase. The composite material provided by the invention is an all-solid-state Z-type composite system photocatalyst, synthesis of a small part of 2H-MoSe2 into 1T-MoSe2 and a 1T phase serves as a bridge of electron transfer, separation of electron-hole pairs is further promoted, and therefore, a constructed photoelectrocatalysis system can greatly improve the photoelectrocatalysis performance, so that the yield of H2O2 is increased, and the production of H2O2 is more facilitated. The preparation method provided by the invention is simple, mild in condition, controllable in process and beneficial to industrial realization, and has a wide practical prospect.

Description

technical field [0001] The invention belongs to photoelectric catalytic synthesis of H 2 o 2 Technical field, relates to a kind of 1T / 2H-MoSe 2 @TiO 2 Nanocomposite materials and their preparation methods and applications, especially related to an in-situ synthesized all-solid-state Z-type heterostructure photocatalyst and its preparation method, photocatalytic production of H 2 o 2 in the application. Background technique [0002] Currently industrially synthesized hydrogen peroxide (H 2 o 2 ) methods mainly include anthraquinone method and hydrogen (H 2 ) and oxygen (O 2 ) directly synthesized, but the anthraquinone method involves different hydrogenation and oxidation reactions, consumes a large amount of organic solvent and energy, and H 2 with O 2 Direct synthesis is prone to explosion. Therefore, the industry has always needed to find a safe, environmentally friendly and energy-saving synthetic H 2 o 2 effective method. In recent years, many researchers h...

Claims

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Application Information

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IPC IPC(8): C25B1/55C25B1/30C25B11/091
CPCC25B1/30Y02P20/133
Inventor 张旭东林仕伟陈汉德符坚周义龙陈宝林正玺王玲转林慧媛符智豪黄修彩
Owner HAINAN UNICAN SCI & TECH INNOVATION INST CO LTD
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