Strontium titanate catalyst for hydrogenation by photolysis of water via visible light and preparation method

Abstract

The invention discloses a strontium titanate catalyst for hydrogenation by photolysis of water via visible light and a preparation method. The strontium titanate catalyst has the advantages that the strontium titanate catalyst nanoparticles and carbon source material are uniformly mixed and then carbonized at high temperature; by carbonizing the carbon source material, the carbon particles are loaded to the surface of the strontium titanate, and a large amount of low-valence state Ti2+ is formed at the surface of the strontium titanate, so that the surface energy state is established, the forbidden bandwidth of the strontium titanate is reduced, and the spectrum response range is widened to the visible light; the carbon particles at the surface can be used as electron acceptors, so that the function of separating electron cavities is realized, the separating efficiency of current carriers is improved, and the hydrogenation efficiency by photolysis of water via the strontium titanate catalyst is improved.

Description

technical field [0001] The invention belongs to the research field of production and utilization of new clean energy, and relates to a strontium titanate material with full-spectrum photolysis water performance and a preparation method thereof. Background technique [0002] Fossil energy is a non-renewable resource. With its massive consumption and exploitation, human beings are facing serious environmental pollution and energy crisis. Hydrogen is a clean and renewable energy, and photolysis of water to produce hydrogen is a way to fundamentally replace fossil energy. In 1972, Fujishima first used the surface coated with TiO 2 The electrode material photocatalytically splits water. Since then, research on the use of semiconductor materials for photolysis of water to produce hydrogen has been widely carried out. Improving the utilization range of the solar spectrum is an important way to improve photocatalytic efficiency. However, limited by the bandgap width of semiconduct...

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Problems solved by technology

However, SrTiO 3 The band gap is 3.2eV, and it only responds to ultraviolet light with a wavelength less than 390nm in the solar spectrum, and ultraviolet light only accounts for about 5% of the solar spectrum

[0005] Although some studies have reported that the use of hydrogenation reduction can reduce the TiO 2 However, Sun Tao conducted catalytic research on high-pressure hydrogenated strontium titanate in his doctoral thesis "Strontium titanate energy band structure modulation and photocatalytic application research", and found that high-pressure hydrogenated strontium titanate has no absorption edge The red shift and visible light catalytic activity of

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