Synthesis and application of nitrogen-doped graphene quantum dot/similar-graphene phase carbon nitride composite material

Abstract

The invention discloses synthesis of nitrogen-doped graphene quantum dot / similar-graphene phase carbon nitride composite material and research and application of photocatalytic decomposition of aquatic hydrogen performance. A catalyst is composed of a nitrogen-doped graphene quantum dot and similar-graphene phase carbon nitride. Under simulated sunlight, the catalyst can efficiently and stably achieve water photolysis to produce hydrogen. The synthesis and application have the advantages that the catalyst is completely composed of nonmetal elements and has the advantages of being environmentally friendly and low in cost; the light response range of the similar-graphene phase carbon nitride is enlarged due to the doping of the nitrogen-doped graphene quantum dot, and absorption under the visible light is increased; the photosensitization effect and the ultrastrong electron conduction capacity of the nitrogen-doped graphene quantum dot are utilized at the same time, photo-induced electron and hole composition is restrained, and meanwhile the light utilization rate is improved; the raw materials are low in cost and easy to obtain, the synthesis method is simple, the synthesis yield and purity are high, and experimental repeatability is good.

Description

technical field [0001] The invention relates to the synthesis of a nitrogen-doped graphene quantum dot / graphene-like phase carbon nitride composite material and the research and application of photocatalytic decomposition of water to produce hydrogen. Background technique [0002] The 21st century is an era of high-tech development, and the development of new materials, information and biotechnology is the representative of high-tech. Photocatalysis originated from TiO reported in 1972 2 As an electrode material, it is reported that light can decompose water to generate hydrogen, so people began to pay attention to this technology---photocatalyst. Compared with traditional electrolysis, physical or chemical methods, the photocatalytic decomposition method is simple and the raw materials are cheap, but the catalytic efficiency is relatively low. Therefore, finding catalysts with high synthesis efficiency and good photocatalytic performance has become a research hotspot in th...

AI Technical Summary

Problems solved by technology

Compared with traditional electrolysis, physical or chemical methods, the method of photocatalytic decomposition is simple and the raw materials are cheap, but the catalytic efficiency is relatively low. Therefore, finding catalysts with high synthesis efficiency and good photocatalytic performance has become a research hotspot in this field.

The key to successful photocatalytic water splitting is to find a suitable catalyst. At present, semiconductor photocatalysts are the most widely used, but the catalytic efficiency is low. In order to further improve the water decomposition rate, the modification of traditional catalysts and the development of new catalysts , the vast number of researchers have carried out a lot of research work

[0003] At this stage, most of the semiconductor photocatalytic materials developed and developed by people can only absorb ultraviolet light, which accounts for less than 5% of the solar spectrum reaching the earth, and the utilization rate of solar energy is low.

As a typical semiconductor photocatalytic material, nitrogen-doped graphene quantum dots can be used as a stable and effective photosensitizer and co-catalyst, which has a good auxiliary catalytic effect on the photocatalytic decomposition of water to produce hydrogen, but the defect is photostability slightly worse

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