Preparation method and application of gallium-indium-zinc ternary nitrogen oxide

Abstract

The invention discloses a preparation method of gallium-indium-zinc ternary nitrogen oxide. Ga(NO3)3*xH2O, Zn(Ac)2*2H2O, In(NO3)3*XH2O serve as a gallium source, a zinc source and an indium source, ethanol amine and a small amount of acetic acid serve as solvents, uniform precursor mixed solution is acquired by a solvent thermal method, a precursor is placed in a low-temperature environment for along time and is gel-like, the precursor is roasted at high temperature to obtain faint yellow gallium-indium-zinc oxide (GIZO), and finally, high-temperature nitridation is performed in ammonia atmosphere to prepare a grayish-green GIZNO nano-material. The prepared GIZNO has an obvious core-shell structure, density functional theory (DFT) calculation proves that the core-shell structure can effectively promote separation of photon-generated carriers in the photocatalytic water splitting process, and photocatalytic water splitting can be efficiently performed. 1wt% of rhodium (Rh) is loaded toserve as a co-catalyst, under the irradiation condition of visible light (lambda>=420nm), photocatalytic water splitting hydrogen production rate is 603 micromoles h<-1> g<-1>, oxygen production rateis 274 micromoles h<-1> g<-1>, the apparent quantum efficiency of a 430nm position reaches 3.5%, and a good application prospect is shown.

Description

technical field [0001] The invention belongs to the field of chemistry and relates to the technical field of photocatalytic nano material preparation, in particular to a preparation method and application of a nano-core-shell gallium indium zinc ternary nitrogen oxide. Background technique [0002] In 2005, Domen et al prepared GaN / ZnO photocatalyst by direct nitriding solid solution method, and conducted in-depth analysis on its synthesis method, characterization results, material modification and other aspects. This is the first nitride solid solution photocatalyst that decomposes pure water under visible light, and it is also a very efficient photocatalyst that can decompose pure water using visible light. Gallium nitride has a hexagonal wurtzite structure and is currently mainly used in semiconductor lighting and is the core component of light-emitting diodes. The application of zinc oxide is relatively wide, its band gap and exciton binding energy are large, and it has...

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Problems solved by technology

The two have many things in common. Both GaN and ZnO are UV-responsive semiconductors. Their band gaps are 3.4eV and 3.2eV respectively, and their utilization rate of solar energy is less than 5%.

The advantage of the high-temperature sintering method is that the method is relatively simple. It only needs to mix and nitride the raw materials, but it also has certain disadvantages. Long-term high-temperature sintering and volatilization lead to a decrease in the zinc content of the solid solution, especially the content of Zn close to the surface layer is even close to zero.

However, as we all know, the catalytic reaction is a surface reaction, such a result will not only reduce its visible light application range, but will certainly affect the catalytic effect

In addition, the composition of the obtained product is not particularly uniform by simply nitriding the precursor, which will also affect the photocatalytic activity and reproducibility of the sample.

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