Nanometer hollow structure of multi-metal nitrogen oxide as well as preparation method and application of nanometer hollow structure

Abstract

The invention discloses a nanometer hollow structure of multi-metal nitrogen oxide as well as a preparation method and application of the nanometer hollow structure. The nanometer hollow structure material of the multi-metal nitrogen oxide is prepared and obtained by using a template adsorption method, a multi-metal ion solution and subsequent nitrogen treatment. The nanometer hollow structure of an oxide with multiple metal components is nitrogenized and prepared into the nanometer hollow structure of various nitrogen oxide, such as a solid solution nitrogen oxide (Ga1-xZnx)(N1-xOx), a chemometry nitrogen oxide LaTiO2N, and a mixed nitrogen oxide (Ga1-xZnx)(N1-xOx)-InN. The specific surface area of the nanometer hollow structure is larger than or equal to 50m<2>. g<-1>, which is far larger than the specific surface area (smaller than or equal to 5m<2>. g<-1>) of conventional multi-metal nitrogen oxide; the shell layer thickness of the nanometer hollow structure is smaller than or equal to 20 nanometers; the granule size of the nanometer hollow structure is smaller than or equal to 10 nanometers, which is far smaller than the granule size (micron dimension) of conventional multi-metal nitrogen oxide; therefore, the defects that the multi-metal nitrogen oxide is difficult to realize nanocrystallization and the specific surface area is extremely low are overcome; the use efficiency of a catalyst can be greatly improved, the usage amount of the catalyst is reduced, and the catalyst has good application prospects; in addition, the nanometer hollow structure can also be used for the respects of gas catalysis, gas sensitivity, lithium ion batteries and the like.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a multi-metal oxynitride nano hollow structure and its preparation method and application. Background technique [0002] In recent years, the energy crisis has become increasingly prominent and the environmental problems caused by fossil fuels have become more and more serious. Finding clean new energy is a major issue in the new century. Using semiconductor photocatalysis to produce H from water 2 It is one of the effective ways to obtain clean energy, but most semiconductors are not suitable for photocatalytic hydrolysis of H 2 . Metal nitrides and metal oxynitrides are a new catalyst system. In particular, nitrides and oxynitrides containing multiple metal components, because of the presence of multiple metal components and oxygen and nitrogen, make multi-metal oxynitride not only reduce the bandgap width but also regulate the position of the energy band , so this compound is ...

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Problems solved by technology

For example Maeda, K.; Teramura, K.; Lu, D. et al, J. Phys. Chem. B, 2006, 110, 13753-13758; Maeda, K.; Teramura, K.; Lu, D. et al , Nature 2006, 440 (7082), 295-295; Japanese Patent JP2005144210-A are all reported (for the preparation process see figure 1 ), first of all, multi-metal oxides containing zinc oxide and gallium oxide should be prepared by co-precipitation, because Zn 2+ , Ga 3+ The precipitation pH of the two ions is very different (the formation of Zn 2+ The pH of the precipitate is about 6, forming Ga 3+ The pH of the precipitation is about 3), and during the co-precipitation process will lead to Ga 3+ Precipitate first and Zn 2+ post-precipitation, so that after the entire co-precipitation is completed, the particle size of the gallium-rich oxide in the multi-metal oxide is precipitated and grown first, which is much larger than the particle size of the zinc-rich oxide, so the manufacturing Large size (200 nanometers to 2 microns) and uneven size distribution of the obtained multi-metal oxide material particles

And the subsequent high-temperature nitriding process requires a temperature above 900°C. At such a high temperature, it must undergo a solid-state reaction process, and the materials in the mixture will undergo severe melting and agglomeration, making the obtained multi-metal nitrogen oxidation. The particle size of the compound is further increased (on the order of 10 microns), so the existing technology cannot produce nanostructured polymetallic oxynitride, which greatly limits the application of this type of material

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