A polyoxometalate composite metal-organic framework material for visible light photolysis of water to produce hydrogen and its preparation method

Abstract

The invention discloses a polyoxometallate composite metal-organic framework material for visible light photolysis of water to produce hydrogen and a preparation method thereof. The preparation method includes the following steps: first, sequentially add nickel nitrate, zinc nitrate, water, 1 , add 10-phenanthroline, phosphoric acid, and sodium tungstate into the container, mix and stir the reaction thoroughly to prepare a reaction precursor; then put the reaction precursor into a hydrothermal kettle for hydrothermal reaction to prepare a reaction suspension; Finally, the reaction suspension is centrifuged, washed, and dried in order to obtain a polyoxometallate composite metal-organic framework material for visible light photolysis of water for hydrogen production. The preparation method of the present invention is simple, low-cost, and can be produced on a large scale. The prepared polyoxometallate composite metal-organic framework material for visible light photolysis of water to produce hydrogen does not require the addition of other photosensitizers and precious metal cocatalysts. Under the action of visible light, visible light catalytic decomposition of water can be achieved to produce hydrogen.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a polyoxometalate composite metal-organic framework material for visible light photolysis of water to produce hydrogen and a preparation method thereof. Background technique [0002] Hydrogen energy has become the most promising clean energy to replace existing fossil energy because of its high combustion value, abundant reserves, and no pollution. Therefore, the conversion and development of hydrogen energy has become a research hotspot in the energy field. Using renewable energy such as solar energy to complete the conversion of hydrogen energy is an inevitable trend of sustainable development in the energy field. At present, the research in this field still has the problem of using only 4% of the solar energy in the ultraviolet band light source (λ<400nm) to split water and produce hydrogen, and the hydrogen production efficiency is not high. The main reaso...

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Problems solved by technology

[0005] However, most of these hydrogen production systems use polypyridine iridium complexes (lr(ppy) 2 (dtbbpy)) + Or other chromophores as photosensitizers, and studies have pointed out that the type and content of photosensitizers have a greater impact on its photocatalytic performance

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