Preparation method of a novel catalyst for hydrogen production by photolysis of water without precious metals

Abstract

The invention relates to a preparation method of a solar light splitting water hydrogen production catalyst without noble metal as a cocatalyst. Specifically, graphene is used as a cocatalyst to prepare semiconductor nanoparticle-graphene composite photocatalysts, including CdS-graphene composites and TiO2-graphene composites. The hydrogen production efficiency of the photocatalyst with graphene as the cocatalyst is comparable to or even higher than that of the photocatalyst containing the same mass of noble metal Pt under the same hydrogen production conditions. Graphene materials have good electron aggregation and transport functions, which promote the effective separation of electrons and holes, reduce the probability of proton recombination, and increase the photocatalytic efficiency of photocatalysts and the efficiency of photo-splitting water to produce hydrogen; and the preparation method of graphene materials is simple , cheaper than precious metals, and has no pollution to the environment, which is conducive to large-scale preparation and production. The preparation of photocatalysts using graphene as a cocatalyst has opened up a new method for reducing the cost of hydrogen production from solar energy and improving the efficiency of hydrogen production by photolysis of water.

Description

technical field [0001] The invention relates to a preparation method of a solar water splitting hydrogen production catalyst without using noble metals as cocatalysts, and belongs to the fields of photocatalysis technology and environmental science. Background technique [0002] Hydrogen energy is considered to be one of the most ideal secondary energy sources in the future because of its pollution-free nature. With the utilization and development of solar energy resources, it has become a research hotspot in the field of hydrogen preparation to use solar energy to split water to produce hydrogen. However, the hydrogen production efficiency is generally low in most photocatalytic hydrogen production systems, and noble metal materials are still required as cocatalysts. Therefore, a very important aspect of hydrogen production by photolysis of water is the preparation of photocatalysts with good stability, visible light response, high hydrogen production efficiency and low pr...

AI Technical Summary

Problems solved by technology

Usually, noble metals Pt, Pd, Ru and Rh are used as cocatalysts with CdS, TiO 2 and other semiconductor materials to improve its photocatalytic activity and photo-splitting water hydrogen production efficiency, but precious metals are expensive, difficult to recycle, and unfriendly to the environment, which restricts its use. Therefore, researchers hope to establish a new hydrogen production system or discover Cheap and environmentally friendly green materials replace precious metals to achieve efficient and low-cost hydrogen production

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