CN109569727B - Preparation and application of high-efficiency hydrogen-producing double-halide perovskite photocatalyst - Google Patents
Preparation and application of high-efficiency hydrogen-producing double-halide perovskite photocatalyst Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000001257 hydrogen Substances 0.000 title claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 21
- 239000002243 precursor Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 12
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 12
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 12
- 229910052794 bromium Inorganic materials 0.000 claims description 12
- 230000001699 photocatalysis Effects 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229940071870 hydroiodic acid Drugs 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 150000004820 halides Chemical class 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical group [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 2
- 125000001246 bromo group Chemical group Br* 0.000 claims description 2
- 229910052801 chlorine Chemical group 0.000 claims description 2
- 239000000460 chlorine Chemical group 0.000 claims description 2
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 claims description 2
- -1 methylamino, amidino Chemical group 0.000 claims description 2
- 125000000962 organic group Chemical group 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 229910052736 halogen Inorganic materials 0.000 abstract description 2
- 150000002367 halogens Chemical class 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 229910000510 noble metal Inorganic materials 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 10
- ISWNAMNOYHCTSB-UHFFFAOYSA-N methanamine;hydrobromide Chemical compound [Br-].[NH3+]C ISWNAMNOYHCTSB-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012433 hydrogen halide Substances 0.000 description 1
- 229910000039 hydrogen halide Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
- B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
- B01J2531/44—Lead
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
Preparation and application of a double-halide perovskite photocatalyst for efficiently producing hydrogen belong to the technical field of preparation of catalysts. The double-halide perovskite photocatalyst is prepared by a simple process, and the element content and the forbidden bandwidth in the perovskite crystal can be regulated and controlled by controlling the adding proportion of two halogens in the precursor solution. The catalyst has the advantages of simple preparation process, low cost, reaction temperature of 40-110 ℃ and normal pressure. The obtained catalyst has no noble metal platinum promoter under the condition of visible light, and shows excellent catalytic activity.
Description
Technical Field
The invention relates to a method for preparing hydrogen by catalytically decomposing hydroiodic acid under visible light, in particular to a method for preparing a double-halide perovskite photocatalyst and application thereof.
Background
In the modern society with rapidly increasing global economic and technological levels, environmental issues have been one of the concerns of people. The influence of energy and environmental pollution problems on human life is more obvious in recent years, water environment pollution, haze air and the like threaten the health of people, and on the other hand, the shortage of petroleum and coal resources has to be paid more attention to by people. Therefore, the development of clean energy and the vigorous popularization of clean fuel become one of the important approaches to solve the energy and environmental problems at present.
Solar-driven splitting of hydrohalic acid (HX) is one of the main directions for hydrogen production, and is an excellent approach to energy and environmental issues. In addition, the simultaneous oxidation reactions involving the cleavage of HX produce value-added chemicals, such as I2/I3 -It has a variety of uses in the energy and hygiene industry. In 2017, Korea scientist Nam converts perovskite CH3NH3PbI3Is applied in the field of hydrogen production by photolysis of hydroiodic acid and has made great progress. However, CH3NH3PbI3The defects of easy recombination of photo-generated electrons and holes, low light utilization rate and the like exist, and the application of the photo-generated electrons and holes in the field of energy sources is limited. Therefore, there is a need to develop a novel catalyst.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the double-halide perovskite catalyst for preparing hydrogen by decomposing the photocatalytic hydroiodic acid is strong in catalytic capacity, simple in synthesis process, mild in operation condition, economical and applicable.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a photocatalyst comprises the following steps:
1) according to the general chemical formula APbI3-xBxThe molar ratio of the medium elements is proportioned, and corresponding amount of AI and PbI are weighed2、AB、PbB2As the perovskite precursor material, A is one or more mixed organic groups of methylamino, amidino and dimethylamino, and B is bromine or chlorine, wherein x is more than 0 and less than 3, and preferably x is more than or equal to 0.05 and less than or equal to 0.2;
2) dissolving the precursor material in the step 1) in an organic solvent according to the molar weight of the precursor material, preferably preparing a perovskite precursor solution with the Pb concentration of 0.1-5mol/L, wherein the organic solvent is one or a mixed solution of two of gamma-butyrolactone (GBL), N, N-Dimethylformamide (DMF) and dimethyl sulfoxide (DMSO).
3) Keeping the perovskite precursor solution obtained in the step 2) for 2-10 hours at 40-110 ℃ under the condition of stirring;
4) heating the perovskite solution obtained in the step 3), keeping the solution at the temperature of 50-120 ℃ for 4-20 hours, and evaporating the solvent accompanied with precipitation of crystal grains;
5) centrifuging and washing the perovskite crystal obtained in the step 4) for multiple times by using ether, and centrifuging;
6) drying the perovskite crystal obtained in the step 5), such as drying at 60 ℃, to obtain APbI3-xBxA photocatalyst.
The invention also comprises APbI prepared by the preparation method of the photocatalyst3-xBxThe application of the photocatalyst in the separation and production of hydrogen by photocatalytic hydroiodic acid.
The method specifically comprises the following steps: adding a mixed solution of hydrogen halide acid containing HI and HBr into a quartz photocatalytic reactor, then adding the double-halide perovskite until the solution is saturated, adding the double-halide perovskite on the basis of the solution saturation, blowing gas for 30 minutes by using pure nitrogen, sealing and irradiating under a 300W xenon lamp.
The invention has the beneficial effects that: by adopting the mixed anion type perovskite system, the crystal defect is improved, the service life of a current carrier is prolonged, and the transmission of the current carrier is enhanced, so that the photocatalytic performance and the stability of the perovskite crystal are improved.
The preparation method adopted by the invention has the characteristics of simple process, low cost, mild preparation conditions and the like.
Drawings
FIG. 1 shows a sample CH prepared according to the present invention3NH3PbI3-xBrx(X ═ 0,0.05,0.10,0.15,0.20) by X-ray powder diffraction pattern.
FIG. 2 shows a sample CH prepared according to the present invention3NH3PbI3-xBrx(x is 0,0.05,0.10,0.15,0.20) ultraviolet-visible absorption spectrum.
FIG. 3 shows a sample CH prepared according to the present invention3NH3PbI3-xBrxDistribution diagram of forbidden band width (x is 0,0.05,0.10,0.15,0.20)
FIG. 4 shows a sample CH prepared according to the present invention3NH3PbI3-xBrxAnd (x is 0,0.05,0.10,0.15 and 0.20) and hydrogen production activity comparison by photocatalysis.
Detailed Description
In order to describe the present invention in more detail, the following examples are given, but not limited thereto.
Example 1
Preparation of the Bihalide perovskite photocatalyst CH in this example3NH3PbI3-xBrxThe method comprises the following steps:
1) according to the chemical formula CH3NH3PbI2.7Br0.3Taking corresponding amount of 2mmol lead iodide (PbI)2) 1.8mmol of methyl amine iodide (CH)3NH3I) And 0.2mmol of methyl ammonium bromide (CH)3NH3Br) as perovskite precursor material (adjusting CH)3NH3I and CH3NH3The proportion of Br can obtain CH with other bromine doping amount3NH3PbI3-xBrxA precursor material);
2) dissolving a precursor material in 1mL of gamma-butyrolactone (GBL), preparing 2mol/L of perovskite precursor solution, and enabling the solution to be yellow;
3) keeping the solution obtained in the step 2) for 8 hours at 70 ℃ in a nitrogen atmosphere under the condition of magnetic stirring;
4) heating the solution obtained in the step 3) in a heating jacket at 110 ℃ for 12 hours until the solvent is completely evaporated and black grains remain.
5) Centrifuging and washing the crystal grains obtained in the step 4) by using ether for 3 times, and centrifuging for 8min at the rotating speed of 8000 r/min;
6) vacuumizing and drying the crystal grains obtained in the step 5) in a vacuum drying oven at 60 ℃ to obtain CH3NH3PbI2.7Br0.3A photocatalyst.
Example 2
Preparation of CH as in example 13NH3PbI3-xBrx，x＝0,0.05,0.10,0.15,0.20。
The photocatalytic activity test method for the prepared material in the examples is as follows:
the photocatalytic hydrogen production test was carried out in a closed quartz test tube (volume 60mL) system (at atmospheric pressure). The light source for irradiation is a 300W xenon lamp with a 420nm filter. The photocatalytic activity of the sample was evaluated by analyzing the amount of hydrogen produced by a gas chromatograph. By the double halide perovskite CH3NH3PbI2.7Br0.3Adding into 20mL mixed solution of halogen acid (HI: HBr molar ratio is 9:1) to saturation, adding 50mg double-halide perovskite on the solution saturation, blowing with high-purity nitrogen for 30 min, sealing, irradiating under 300W xenon lamp, manually sampling 500 μ L gas, and detecting with gas chromatograph.
The experimental results are as follows:
FIG. 1 shows CH with different bromine doping amounts according to the present invention3NH3PbI3-xBrxThe X-ray diffraction pattern of (A) shows that the synthesized CH3NH3PbI3-xBrxNo other miscellaneous peak appears, and the components are purer. The bromine is doped to shift the position of diffraction peak to high angle, and part of tetragonal crystal faceThe diffraction peak (004) crystal face disappears, and the cubic phase crystal face diffraction peak (220) crystal face is dominant, which indicates that bromine is successfully doped into the perovskite crystal structure.
FIG. 2 shows CH with different bromine doping amounts3NH3PbI3-xBrxThe ultraviolet-visible light absorption spectrum of the perovskite crystal structure shows that the absorption band edge has a slight blue shift with the increase of the bromine doping amount, but the absorption range still covers the whole visible light range, which indicates that bromine is successfully doped into the perovskite crystal structure.
FIG. 3 shows CH with different bromine doping amounts3NH3PbI3-xBrxThe forbidden band width distribution graph shows that the forbidden band width of the catalyst is gradually increased along with the increase of the bromine doping amount, and the longer carrier diffusion distance and the fewer carriers are recombined.
FIG. 4 shows CH with different bromine doping amounts3NH3PbI3-xBrxThe curve of the photocatalyst for photocatalytic hydrogen production can be seen from FIG. 4, in the visible light, CH3NH3PbI2.7Br0.1The maximum hydrogen yield is 1471 mu molh-1g-1The hydrogen production activity is obviously higher than that of single halogenated perovskite, about 40 times of the performance of the single halogenated perovskite, and is about 8 times higher than that of the single halogenated perovskite loaded by platinum. This shows that the bromine-doped double-halide perovskite can be used as a novel photocatalyst to catalyze the hydrogen production by decomposing hydroiodic acid, and does not need the load of platinum.
Claims (6)
1. A double-halide perovskite photocatalyst is characterized in that the chemical general formula is APbI3-xBxA is one or more mixed organic groups of methylamino, amidino and dimethylamino, B is bromine or chlorine, wherein x is more than 0 and less than 3;
the preparation method comprises the following steps:
1) according to the general chemical formula APbI3-xBxThe molar ratio of the medium elements is proportioned, and corresponding amount of AI and PbI are weighed2、AB、PbB2As a perovskite precursor material;
2) dissolving the precursor material in the step 1) in an organic solvent according to the molar weight of the precursor material, wherein the organic solvent is one or a mixed solution of two of gamma-butyrolactone (GBL), N, N-Dimethylformamide (DMF) and dimethyl sulfoxide (DMSO);
3) keeping the perovskite precursor solution obtained in the step 2) for 2-10 hours at 40-110 ℃ under the condition of stirring;
4) heating the perovskite solution obtained in the step 3), keeping the solution at the temperature of 50-120 ℃ for 4-20 hours, and evaporating the solvent accompanied with precipitation of crystal grains;
5) centrifuging and washing the perovskite crystal obtained in the step 4) for multiple times by using ether, and centrifuging;
6) drying the perovskite crystal obtained in the step 5) to prepare APbI3-xBxA photocatalyst.
2. A double halide perovskite photocatalyst as claimed in claim 1, wherein x is 0.05. ltoreq. x.ltoreq.0.2.
3. A method of preparing a double halide perovskite photocatalyst as claimed in claim 1 or 2, comprising the steps of:
1) according to the general chemical formula APbI3-xBxThe molar ratio of the medium elements is proportioned, and corresponding amount of AI and PbI are weighed2、AB、PbB2As a perovskite precursor material;
2) dissolving the precursor material in the step 1) in an organic solvent according to the molar weight of the precursor material, wherein the organic solvent is one or a mixed solution of two of gamma-butyrolactone (GBL), N, N-Dimethylformamide (DMF) and dimethyl sulfoxide (DMSO);
3) keeping the perovskite precursor solution obtained in the step 2) for 2-10 hours at 40-110 ℃ under the condition of stirring;
4) heating the perovskite solution obtained in the step 3), keeping the solution at the temperature of 50-120 ℃ for 4-20 hours, and evaporating the solvent accompanied with precipitation of crystal grains;
5) centrifuging and washing the perovskite crystal obtained in the step 4) for multiple times by using ether, and centrifuging;
6) drying the perovskite crystal obtained in the step 5) to prepare APbI3-xBxA photocatalyst.
4. The production method according to claim 3, wherein the step 2) is carried out by preparing a perovskite precursor liquid having a Pb concentration of 0.1 to 5 mol/L.
5. Use of a double-halide perovskite photocatalyst as defined in claim 1 or 2 for photocatalytic hydrogen production of hydroiodic acid and HBr.
6. The use according to claim 5, wherein the quartz photocatalytic reactor is charged with a mixed solution of hydrohalic acid containing HI and HBr, then the double halide perovskite is added until the solution is saturated, the double halide perovskite is added on the basis of the solution saturation, the gas is blown with pure nitrogen for 30 minutes, and then the quartz photocatalytic reactor is sealed and irradiated under a 300W xenon lamp.
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