Photocatalytic hydrogen production system and hydrogen gas preparation method thereof

Abstract

The invention discloses a photocatalytic hydrogen production system by utilizing a stabilizer. The system comprises a catalyst (polycarbonyl diiron dithiolate cluster compound), a photosensitizer (CdTe, CdSe, CdS quantum dots, and the like), a stabilizer (chitosan, beta-cyclodextrin, sodium polyacrylat, polyvinylpyrrolidone, sodium alginate, poly(N-isopropylacrylamide), polydimethyldiallylammonium chloride, benzalkonium chloride, octadecylmethyldihydroxyethyl ammonium bromide, etc.), an electronic sacrificial body (ascorbic acid), and a water-containing solvent. The photocatalytic hydrogen production system has the advantages of simple preparation, cheap and available components, high hydrogen yield efficiency, and good system stability, the hydrogen yield reaches 162 [mu]mol for a system with a total volume of 10 mL for one time, and the hydrogen conversion number is as high as 1615 calculated on the basis of catalyst. The hydrogen yield is only 7.5 [mu]mol in the same system in the absence of the stabilizer, and the hydrogen conversion number is only 57 calculated on the basis of catalyst.

Description

technical field [0001] The invention relates to a hydrogen production system and a method for preparing hydrogen, in particular to a photocatalytic hydrogen production system using a stabilizer and a method for preparing hydrogen. Background technique [0002] With the development of society and economy, human's demand for energy continues to increase, but the fossil energy that humans mainly rely on is approaching exhaustion. Hydrogen energy is a clean and efficient energy. Hydrogen can be effectively converted into electricity through fuel cells and produce water as the only by-product, which has incomparable advantages over fossil energy. The current industrial production of hydrogen is mainly through steam reforming, which requires high temperatures and is accompanied by the generation of greenhouse gases. Photocatalytic hydrogen production usually uses sunlight as energy to reduce water to hydrogen at room temperature. Low energy consumption, mild conditions, green an...

AI Technical Summary

Problems solved by technology

However, there are still some common problems in these systems: first, the catalytic system is not stable under light conditions.

The most stable photocatalytic system reported in the public literature is still prepared by our research group, which loses its catalytic activity after 10 hours of light; and most of the photocatalytic hydrogen production systems lose their catalytic activity after 1 hour of light

Second, the efficiency of catalytic hydrogen production is not high

Third, in order to increase the catalytic activity and water solubility of iron hydrogenase mimics, necessary chemical modifications make the molecular weight of iron hydrogenase mimics larger, and the structure tends to be more complex, which does not meet the requirements of green chemistry

Fourth, most systems use noble metals as photosensitizers, which increases the cost of the system

However, through the role of stabilizers, the photocatalytic hydrogen production system of iron hydrogenase mimetic compounds has not been reported to achieve continuous and efficient catalytic hydrogen production.

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