Preparation method of SrTiO3/SrSO4/Pt double-heterojunction nano material
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A nanomaterial and double heterojunction technology, applied in catalyst activation/preparation, chemical instruments and methods, hydrogen production, etc. Low site and other issues, to achieve the effect of simple operation, cost-friendly and environment-friendly, process controllable
Active Publication Date: 2020-11-10
HEFEI UNIV OF TECH
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[0004] The object of the present invention is to: provide a kind of SrTiO 3 /SrSO 4 The preparation method of /Pt double heterojunction nanomaterials mainly solves the technical problem of improving the high photoelectron-hole recombination rat...
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Embodiment 1
[0034] A SrTiO 3 / SrSO 4 / Pt double heterojunction nanomaterial preparation method, the specific steps are as follows:
[0035] (1) First configure A solution, dissolve 10mmol cysteine in 5ml deionized water, ultrasonically disperse in deionized water, stir vigorously on a magnetic stirrer for five minutes, then add 15mmol strontium nitrate, and then vigorously stir on a magnetic stirrer Stir until the liquid is clear without precipitates, and A solution is obtained.
[0036] (2) Then configure B solution, dissolve 2ml of glacial acetic acid in 40ml of absolute ethanol (AR, 99.5%) and stir for five minutes, then pour into a beaker filled with 10mmol TBT and continue stirring to obtain B solution.
[0037](3) Preparation of precursor solution: Add solution A dropwise during the stirring process of solution B. During the addition process, flocculent precipitates will gradually be found, and continue to stir vigorously for two hours to prepare a precursor solution.
[0038] ...
Embodiment 2
[0046] A SrTiO 3 / SrSO 4 / Pt double heterojunction nanomaterial preparation method, the specific steps are as follows:
[0047] (1) First configure A solution, dissolve 10mmol cysteine in 5ml deionized water, ultrasonically disperse in deionized water, stir vigorously on a magnetic stirrer for five minutes, then add 20mmol strontium nitrate, and then vigorously stir on a magnetic stirrer Stir until the liquid is clear and free of sediment.
[0048] (2) Then configure solution B, dissolve 2ml of glacial acetic acid in 40ml of absolute ethanol (AR, 99.5%) and stir for five minutes, then pour into a beaker filled with 10mmol TBT and continue stirring. A solution of B was obtained.
[0049] (3) Preparation of the precursor: Add the A solution prepared in step (1) dropwise during the stirring process of the B solution. During the addition process, the generation of flocculent precipitates will gradually be found, and continue to stir vigorously for two hours to form a precurso...
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Abstract
The invention discloses a preparation method of a SrTiO3/SrSO4/Pt double-heterojunction nano material. The preparation method comprises the following specific steps: preparing deionized water, glacialacetic acid and absolute ethyl alcohol as solvents and preparing strontium nitrate and tetrabutyl titanate respectively as a strontium source and a titanium source, wherein the added cysteine not only serves as a chelating agent, but also serves as a sulfur source; then preparing a precursor by adopting a sol-gel method, drying theprecursor in a drying box at low temperature for 48 hours, grinding the precursor, and annealing the precursor in a muffle furnace to obtain composite powder of strontium titanate and strontium sulfate; and finally, depositing a layer of platinum on the surface through a photodeposition method to form as a cocatalyst, and thereby the SrTiO3/SrSO4/Pt double-heterojunction nano material is obtained. The SrTiO3/SrSO4/Pt double-heterojunction nano material disclosedby the invention has a porous structure and a relatively large specific surface area, and can provide more active sites for a photocatalytic reaction; besides, the SrTiO3/SrSO4/Pt has very high activity on the precipitation of H2 under the illumination. The nano-material shows great development prospect in the field of photocatalysis.
Description
technical field [0001] The invention belongs to the field of photocatalysts, in particular to a SrTiO 3 / SrSO 4 / Pt double heterojunction nanomaterials preparation method. Background technique [0002] SrTiO 3 It has adjustable band structure and proper bandgap width (3.4eV). It can be used for photocatalytic water splitting and photoreduction of carbon dioxide to produce fuel. At the same time, it has the advantages of low cost and environmental friendliness. SrTiO 3 It is a perovskite-type material with great potential for photocatalytic conversion of renewable energy. But SrTiO 3 The main factor limiting the development in the field of photocatalysis is the easy recombination of photogenerated electrons and holes. There are many ways to suppress the recombination of photogenerated electrons and holes, including the deposition of ion-doped metals or nonmetals and noble metals. Combining two semiconductors with different conduction band and valence band positions t...
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