Catalysis system for hydrogen generation by catalytic reduction of water with visible light, and preparation method thereof

Abstract

The invention discloses a catalysis system for hydrogen generation by catalytic reduction of water with visible light, and a preparation method thereof. The catalysis system comprises an eosin / rhodamine B (methyl red or vitamin 12) combined composite dye adopted as a sensitizing agent, carbon nanotubes adopted as a carrier and a light induced electron channel, and CuO adopted as an assistant catalyst. The preparation method comprises: stirring and mixing the carbon nanotubes and an aqueous solution of a copper salt; evaporating until no water exists to prepare a carbon nanotube-metal salt precursor; annealing the precursor in the air atmosphere to obtain CuO-loaded carbon nanotubes; placing the CuO-loaded carbon nanotubes into an aqueous solution containing a composite dye, and soaking under the protection of N2 to obtain the hydrogen generation catalysis system. According to the present invention, the catalysis system of the present invention provides high hydrogen generation activity for the hydrogen generation reaction by reduction of the water with the visible light in the presence of the sacrificial agent trolamine, can be used for the hydrogen generation by catalytic reduction of the water with the visible light, and provides a certain application values in the field of the hydrogen generation by reduction of the water with the sunlight.

Description

technical field [0001] The invention belongs to the field of energy technology, and in particular relates to a catalytic system for hydrogen production by catalytic reduction of water with visible light and a preparation method thereof. Background technique [0002] Solar photocatalytic hydrogen production technology is considered to be a very promising hydrogen production method, which has attracted widespread attention. A lot of research work has been done in this field. At present, photocatalytic hydrogen production materials using ultraviolet light can basically meet the requirements of practical applications. However, since most of the solar spectrum falls in the visible region, the solar energy utilization efficiency of these materials is very low. Therefore, obtaining hydrogen-producing materials with high activity in the visible light region is the common focus of scientific and technological workers from all over the world. In this regard, people usually adopt th...

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Problems solved by technology

However, the loading of composite oxides on carbon nanotubes is very difficult, and how to obtain composite cocatalysts with uniform composition is also a problem, which limits the choice of components in composite oxides.

In addition, the inventor of the present application also disclosed a single dye eosin Y as a sensitizer, carbon nanotubes as a carrier, photogenerated electron channels, copper oxide and other oxides in the Chinese invention patent application with the application number 201110003168.4. A co-catalyst for hydrogen production, but the hydrogen production effect is not ideal. One of the main reasons is that only one dye is used when constructing a dye-sensitized photocatalytic system

However, the working wavelength range of the dye is limited and cannot cover the whole solar spectrum, which makes the photocatalytic system unable to fully utilize the sunlight.

Moreover, the above-mentioned catalysts need to be used under strong alkaline conditions, which has certain limitations for large-scale practical use.

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