Method for preparing titanium dioxide/bismuth titanate composite photo-anode
阅读说明：本技术 一种制备二氧化钛/钛酸铋复合光阳极的方法 (Method for preparing titanium dioxide/bismuth titanate composite photo-anode ) 是由 崔永飞 党培培 郭鹏 景盼盼 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种制备二氧化钛/钛酸铋复合光阳极的方法,属于光电化学技术领域,其FTO为基底,第一步通过水热反应在FTO表面均匀生长TiO-(2)薄膜,第二步通过旋涂法在生长TiO-(2)的FTO表面旋涂Bi-(4)Ti-(3)O-(12)的溶胶前驱体,最后再通过退火得到TiO-(2)/Bi-(4)Ti-(3)O-(12)复合光阳极。本发明方法简单易操作,制备周期短,且制备成本较低。所得光阳极材料在模拟太阳光辐照时,斩波光电流响应可达0.03mA/cm～(2),在开发新能源及光电降解方面具有广阔的应用前景。(The invention discloses a method for preparing a titanium dioxide/bismuth titanate composite photo-anode, which belongs to the technical field of photoelectrochemistry 2 Film, second step of growing TiO by spin coating 2 FTO (fluorine doped tin oxide) surface spin coating Bi 4 Ti 3 O 12 Finally obtaining TiO by annealing 2 /Bi 4 Ti 3 O 12 And (4) a composite light anode. The method is simple and easy to operate, short in preparation period and low in preparation cost. When the obtained photo-anode material is used for simulating solar radiation, chopping photocurrent response can reach 0.03mA/cm 2 And has wide application prospect in the aspects of developing new energy and photoelectric degradation.)
1. A method for preparing a titanium dioxide/bismuth titanate composite photo-anode is characterized by comprising the following steps:
the method comprises the following steps: ultrasonically cleaning the FTO sheet by using deionized water, alcohol and isopropanol respectively to remove chemical oil stains, and naturally drying for later use;
step two: titanium-containing esters are used as a titanium source, mineralizer is added and stirred uniformly to prepare TiO2Precursor solution;
step three: adding TiO into the mixture2Adding the precursor solution into FTO for hydrothermal reaction, and naturally cooling after the reaction is finished;
step four: after the reaction is finished, taking out the product, repeatedly washing the product with deionized water, and naturally drying the product at a ventilation position to obtain TiO2(FTO) a substrate;
step five: adding Bi (NO)3)3.5H2Adding O and tetrabutyl titanate into a DMF solvent according to a molar ratio, uniformly stirring, adding PVP, and continuously stirring to obtain Bi4Ti3O12Precursor sol;
step six: adding Bi4Ti3O12Spin coating of precursor sol on TiO2Drying the (FTO) substrate after the spin coating is finished, repeating the spin coating and drying processes, and controlling the number of spin coating layers to obtain a spin coating sample;
step seven: carrying out high-temperature annealing on the spin-coated sample to obtain TiO2/Bi4Ti3O12And (4) a composite light anode.
2. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein magnetic stirring is adopted in the second step, the stirring speed is 500r/min, and the stirring time is 30 min.
3. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein the titanium-containing ester in the second step is tetrabutyl titanate, the mineralizer is 6mol/L HCl solution, and 5ml of HCl solution is dissolved in each 0.12ml of tetrabutyl titanate.
4. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein the FTO is two pieces in step three, the bottom of the two pieces of FTO are in contact, the top of the two pieces of FTO are separated, the two pieces of FTO are placed obliquely to feet, and the FTO conductive surface is placed downwards.
5. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein the hydrothermal reaction temperature in the third step is 150 ℃ to 200 ℃ for 4 hours.
6. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein the Bi (NO) in step five3)3.5H2The proportion of the O, tetrabutyl titanate, PVP and DMF solvent is (1.2734 g-1.3340) g: 637.5 μ L: 0.34 g: 5 mL.
7. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein in the fifth step, Bi (NO) is added3)3.5H2Adding O and tetrabutyl titanate into a DMF solvent according to a molar ratio, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding PVP, and continuing stirring the mixture for 8h at the rotating speed of 300 r/min.
8. The method for preparing the titanium dioxide/bismuth titanate composite photoanode as claimed in claim 1, wherein in the sixth step, TiO is added2(FTO) the substrate was placed on a spin coater using Bi4Ti3O12Performing two-step spin coating on the precursor sol, wherein the first step has the rotating speed of 500r/min and the time of 10 s; the rotation speed of the second step is 4000r/min, and the time is 20 s.
9. The method for preparing the titanium dioxide/bismuth titanate composite photo-anode according to claim 1, wherein in the sixth step, the drying temperature is 300 ℃ and the drying time is 5-10 min.
10. The method for preparing the titanium dioxide/bismuth titanate composite photo-anode according to claim 1, wherein the high-temperature annealing mechanism in the seventh step is to heat the titanium dioxide/bismuth titanate composite photo-anode from room temperature to 600 ℃ at a speed of 5 ℃/min, preserve the temperature for 30min, then cool the titanium dioxide/bismuth titanate composite photo-anode to 500 ℃ at a speed of 5 ℃/min, and finally naturally cool the titanium dioxide/bismuth titanate composite photo-anode to room temperature.
Technical Field
The invention belongs to the field of photoelectric water decomposition and photoelectric degradation, and particularly relates to a method for preparing a titanium dioxide/bismuth titanate composite photo-anode.
Background
Titanium dioxide (TiO)2) It is considered to be a highly efficient and environmentally friendly photocatalyst due to its high optical activity, light stability, low cost and non-toxicity. However, titanium dioxide has some inherent disadvantages, such as being relatively poorThe large band gap (3.2-3.4 ev, excited only by uv light) and the rapid charge pair recombination limit its photoanode applications. Therefore, the development of the composite photo-anode material with high activity to expand the development of the field is very important. For enhancing the photocatalytic activity of titanium dioxide, deposition is carried out using heterojunctions, e.g. TiO2/Bi4Ti3O12At present, the preparation methods of the composite photo-anode include a hydrothermal method, an atomic layer deposition method and the like, but the preparation process still has some problems, for example, the hydrothermal method cannot be quantified, and the atomic layer deposition method is relatively complex and expensive.
Disclosure of Invention
The invention aims to provide a method for preparing a titanium dioxide/bismuth titanate composite photo-anode, which overcomes the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing a titanium dioxide/bismuth titanate composite photoanode comprises the following steps:
the method comprises the following steps: ultrasonically cleaning the FTO sheet by using deionized water, alcohol and isopropanol respectively to remove chemical oil stains, and naturally drying for later use;
step two: titanium-containing esters are used as a titanium source, mineralizer is added and stirred uniformly to prepare TiO2Precursor solution;
step three: adding TiO into the mixture2Adding the precursor solution into FTO for hydrothermal reaction, and naturally cooling after the reaction is finished;
step four: after the reaction is finished, taking out the product, repeatedly washing the product with deionized water, and naturally drying the product at a ventilation position to obtain TiO2(FTO) a substrate;
step five: adding Bi (NO)3)3.5H2Adding O and tetrabutyl titanate into a DMF solvent according to a molar ratio, uniformly stirring, adding PVP, and continuously stirring to obtain Bi4Ti3O12Precursor sol;
step six: adding Bi4Ti3O12Spin coating of precursor sol on TiO2Drying the (FTO) substrate after the spin coating is finished, repeating the spin coating and drying processes, and controlling the number of spin coating layers to obtain a spin coating sample;
step seven: carrying out high-temperature annealing on the spin-coated sample to obtain TiO2/Bi4Ti3O12And (4) a composite light anode.
Further, magnetic stirring is adopted in the second step, the stirring speed is 500r/min, and the stirring time is 30 min.
Further, in the second step, the titanium-containing ester is tetrabutyl titanate, the mineralizer is 6mol/L HCl solution, and 5ml of HCl solution is dissolved in every 0.12ml of tetrabutyl titanate.
Further, in the third step, the FTOs are two pieces, the bottoms of the two pieces of FTOs are in contact, the tops of the two pieces of FTOs are separated, the two pieces of FTOs are obliquely placed to the feet, and the conductive surfaces of the FTOs are placed downwards.
Furthermore, the hydrothermal reaction temperature in the third step is 150-200 ℃ and the time is 4 hours.
Further, step five said Bi (NO)3)3.5H2The proportion of the O, tetrabutyl titanate, PVP and DMF solvent is (1.2734 g-1.3340) g: 637.5 μ L: 0.34 g: 5 mL.
Further, in step five, Bi (NO) is added3)3.5H2Adding O and tetrabutyl titanate into a DMF solvent according to a molar ratio, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding PVP, and continuing stirring the mixture for 8h at the rotating speed of 300 r/min.
Further, in the sixth step, TiO is added2(FTO) the substrate was placed on a spin coater using Bi4Ti3O12Performing two-step spin coating on the precursor sol, wherein the first step has the rotating speed of 500r/min and the time of 10 s; the rotation speed of the second step is 4000r/min, and the time is 20 s.
Further, in the sixth step, the drying temperature is 300 ℃, and the drying time is 5-10 min.
Further, the high-temperature annealing mechanism in the seventh step is that the temperature is raised to 600 ℃ from the room temperature at the speed of 5 ℃/min, the temperature is preserved for 30min, then the temperature is lowered to 500 ℃ at the speed of 5 ℃/min, and finally the temperature is naturally cooled to the room temperature.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention adopts a method combining simple hydrothermal and spin-coating to prepare TiO2/Bi4Ti3O12The two methods are simple, the operation is simple and convenient, and the conditions are suitable. First, TiO2As a photo-anode, the material has the advantages of low cost, no toxicity, good photochemical and thermal stability, high photocatalytic activity and the like, and is widely researched in the aspect of water decomposition of PEC. However, due to TiO2The photocatalyst has a wide forbidden band of 3.2eV, and only ultraviolet part energy accounting for 4% of sunlight is absorbed, which limits practical application thereof because of low response to visible light and insufficient solar energy conversion efficiency. Therefore, efforts have been made to extend its absorption range into the visible region, including coupling with plasmonic metal nanoparticles and narrow bandgap semiconductor materials. TiO prepared additionally2The nano wire is relative to other TiO powder, fiber and the like2In other words, it has better stability and a slightly narrower forbidden band width, Bi4Ti3O12Is a ferroelectric material with a layered perovskite-like structure, can achieve the purpose of inhibiting photo-generated charge recombination by utilizing the ferroelectric property of the ferroelectric material, and forms TiO by utilizing the advantages of the two materials2/Bi4Ti3O12Heterostructure e-From TiO2Moves to the counter electrode and undergoes a reduction reaction to produce H2；h+From Bi4Ti3O12VB moves to the surface of the electrode to generate oxidation reaction and generate O2During the reaction, due to Bi4Ti3O12Internal spontaneous polarization of TiO2And Bi4Ti3O12The energy band at the interface is bent upward, facilitating the separation and migration of photo-generated charges. Thereby allowing the PEC performance of the sample to be improved and exhibiting a higher photocurrent density. Under the irradiation of simulated sunlight, an I-T curve is tested, a voltage of 0.5V is applied, and the photocurrent density can reach 0.03mA/cm2Is pure TiO218 times higher than the original value. The preparation method of the inventionSimple, the obtained material is stable and easy to apply, and is beneficial to popularization and application of industrial production.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is an XRD pattern of the photoanode material prepared in example 1.
FIG. 2 shows TiO prepared in example 12(FTO),TiO2/Bi4Ti3O12SEM image of composite photoanode, wherein (a) is pure TiO2SEM image of sample, (b) is TiO2/Bi4Ti3O12SEM image of the composite photo-anode sample.
FIG. 3 shows TiO prepared in example 12(FTO),TiO2/Bi4Ti3O12The composite photoanode is 0.05mol/L of Na2SO4Constant potential polarization electrochemical response curves-I-T curves in electrolyte solution under light and dark.
Detailed Description
The present invention is described in detail below:
a method for preparing a titanium dioxide/bismuth titanate composite photoanode comprises the following steps:
1) ultrasonically cleaning an FTO (fluorine-doped tin oxide conductive glass) sheet for 10min by using deionized water, alcohol and isopropanol respectively to remove chemical oil stains, then placing the FTO sheet on filter paper, and naturally drying the FTO sheet for later use;
2) TiO is prepared by taking titanium-containing esters as a titanium source and adding a mineralizer2The precursor solution is placed on a magnetic stirrer and stirred for 30min at the speed of 500r/min, wherein Ti4+The concentration is 0.07 mol/L;
the titanium-containing esters are tetrabutyl titanate, the mineralizer is 6mol/L HCl solution, and 0.12ml of tetrabutyl titanate is dissolved into 5ml of HCl solution;
3) placing the cleaned FTO in the inner liner of the hydrothermal kettle, and enabling the conductive surface of the FTO to face downwards; adding the prepared precursor solution into a reaction kettle, putting the reaction kettle into an electric heating constant-temperature air blast drying oven, reacting for 3-12 hours at 150-200 ℃, and naturally cooling after the reaction is finished;
the FTO is obliquely arranged on two sides;
4) opening the hydrothermal reaction kettle, taking out the FTO, repeatedly washing with deionized water, and naturally drying for 4 hours at a ventilation position to obtain TiO2(FTO) a substrate;
5) adding Bi (NO)3)3.5H2Adding O and tetrabutyl titanate into a DMF solvent, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding PVP, continuing stirring the mixture for 8h at the rotating speed of 300r/min to obtain Bi4Ti3O12Precursor sol;
the Bi (NO)3)3.5H2O (excessive 5-10%) and tetrabutyl titanate are 1.2734-1.3340 g and 637.5 mu L respectively, the mass of PVP is 0.34g, and the DMF solvent is 5 mL;
6) the obtained TiO is2(FTO) placing the substrate on a spin coater, performing spin coating by using the prepared sol, and setting a program to be a multi-step spin coating mode; after the spin coating is finished, drying the sample on a high-temperature heating table at 300 ℃ for 5-10 min; repeating the above process, and controlling the number of spin coating layers;
the first-step rotating speed of the spin coater is 500r/min and 10 s; the second step is that the rotating speed is 4000r/min and 20 s; dropping Bi when the first step rotating speed is slower4Ti3O12The precursor solution is uniformly spin-coated at a high speed in the second step, and the precursor can be uniformly spin-coated on the substrate through the two-step spin coating.
7) Keeping the obtained spin-coating sample at 600 ℃ for 30min to obtain TiO2/Bi4Ti3O12A composite light anode;
the sample annealing mechanism is that the temperature of a muffle furnace is raised to 600 ℃ from the room temperature at the speed of 5 ℃/min, the temperature is kept for 10-30 min, then the temperature is lowered to 500 ℃ at the speed of 5 ℃/min, and finally the sample is cooled to the room temperature along with the furnace, so that the sample can be taken out;
TiO prepared by the invention2/Bi4Ti3O12The composite photoanode can be used for hydrogen production by photolysis of water and photoelectric degradation of organic matters.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is illustrative of the embodiments and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example 1
Ultrasonically cleaning the FTO sheet by using deionized water, alcohol and isopropanol for 10min respectively to remove chemical oil stains, then placing the FTO sheet on filter paper, and naturally drying the FTO sheet for later use; 0.12mL of tetrabutyl titanate serving as a titanium source is added into 5mL of mineralizer of 6mol/L HCl to prepare TiO2The precursor solution is placed on a magnetic stirrer and stirred for 30min at the speed of 500 r/min; placing the cleaned FTO in the inner liner of the hydrothermal kettle, and enabling the conductive surface of the FTO to face downwards; adding the prepared precursor solution into a reaction kettle, putting the reaction kettle into an electric heating constant-temperature air blast drying oven, reacting for 3 hours at 150 ℃, and naturally cooling after the reaction is finished; opening the hydrothermal reaction kettle, taking out the FTO, repeatedly washing with deionized water, and naturally drying for 4 hours at a ventilation position to obtain TiO2(FTO) a substrate; 1.2734g of Bi (NO)3)3.5H2Adding O (excessive 5%) and 637.5 mu L tetrabutyl titanate into a DMF solvent according to a molar ratio, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding 0.34g PVP, continuing stirring the mixture for 8h at the rotating speed of 300r/min to obtain Bi4Ti3O12Precursor sol; the obtained TiO is2(FTO) placing the substrate on a spin coater, performing spin coating by using the prepared sol, and setting a program to be a multi-step spin coating mode; after the spin coating is finished, drying the sample on a high-temperature heating table at 300 ℃ for 8 min; repeating the above process, and controlling the number of spin coating layers; carrying out high-temperature annealing on the obtained spin-coated sample, wherein the annealing mechanism is that the temperature of a muffle furnace is increased to 600 ℃ from room temperature at the speed of 5 ℃/min, the temperature is kept for 30min, and then the temperature is decreased at the speed of 5 ℃/minHeating to 500 deg.C, and cooling to room temperature to obtain TiO2/Bi4Ti3O12And (4) a composite light anode.
Example 2
Ultrasonically cleaning the FTO sheet by using deionized water, alcohol and isopropanol for 10min respectively to remove chemical oil stains, then placing the FTO sheet on filter paper, and naturally drying the FTO sheet for later use; 0.12mL of tetrabutyl titanate serving as a titanium source is added into 5mL of mineralizer of 6mol/L HCl to prepare TiO2The precursor solution is placed on a magnetic stirrer and stirred for 30min at the speed of 500 r/min; placing the cleaned FTO in the inner liner of the hydrothermal kettle, and enabling the conductive surface of the FTO to face downwards; adding the prepared precursor solution into a reaction kettle, putting the reaction kettle into an electric heating constant-temperature air blast drying oven, reacting for 12 hours at 170 ℃, and naturally cooling after the reaction is finished; opening the hydrothermal reaction kettle, taking out the FTO, repeatedly washing with deionized water, and naturally drying for 4 hours at a ventilation position to obtain TiO2(FTO) a substrate; 1.3340g of Bi (NO)3)3.5H2Adding O (excessive 10%) and 637.5 mu L tetrabutyl titanate into a DMF solvent according to a molar ratio, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding 0.34g PVP, continuing stirring the mixture for 8h at the rotating speed of 300r/min to obtain Bi4Ti3O12Precursor sol; the obtained TiO is2(FTO) placing the substrate on a spin coater, performing spin coating by using the prepared sol, and setting a program to be a multi-step spin coating mode; after the spin coating is finished, drying the sample on a high-temperature heating table at 300 ℃ for 10 min; repeating the above process, and controlling the number of spin coating layers; carrying out high-temperature annealing on the obtained spin-coated sample, wherein the annealing mechanism is that a muffle furnace is heated to 600 ℃ from room temperature at the speed of 5 ℃/min, the temperature is kept for 10min, then the temperature is cooled to 500 ℃ at the speed of 5 ℃/min, and finally the temperature is cooled to room temperature along with the furnace to obtain TiO2/Bi4Ti3O12And (4) a composite light anode.
Example 3
Ultrasonically cleaning the FTO sheet by using deionized water, alcohol and isopropanol for 10min respectively to remove chemical oil stains, then placing the FTO sheet on filter paper, and naturally drying the FTO sheet for later use; 0.12mL of tetrabutyl titanate serving as a titanium source is added into 5mL of mineralizer of 6mol/L HCl to prepare TiO2A precursor solution is prepared by dissolving a precursor in a solvent,placing on a magnetic stirrer, and stirring at 500r/min for 30 min; placing the cleaned FTO in the inner liner of the hydrothermal kettle, and enabling the conductive surface of the FTO to face downwards; adding the prepared precursor solution into a reaction kettle, putting the reaction kettle into an electric heating constant-temperature air blast drying oven, reacting for 5 hours at 150 ℃, and naturally cooling after the reaction is finished; opening the hydrothermal reaction kettle, taking out the FTO, repeatedly washing with deionized water, and naturally drying for 4 hours at a ventilation position to obtain TiO2(FTO) a substrate; 1.2734g of Bi (NO)3)3.5H2Adding O (excessive 5%) and 637.5 mu L tetrabutyl titanate into a DMF solvent according to a molar ratio, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding 0.34g PVP, continuing stirring the mixture for 8h at the rotating speed of 300r/min to obtain Bi4Ti3O12Precursor sol; the obtained TiO is2(FTO) placing the substrate on a spin coater, performing spin coating by using the prepared sol, and setting a program to be a multi-step spin coating mode; after the spin coating is finished, drying the sample on a high-temperature heating table at 300 ℃ for 5 min; repeating the above process, and controlling the number of spin coating layers; carrying out high-temperature annealing on the obtained spin-coated sample, wherein the annealing mechanism is that a muffle furnace is heated to 600 ℃ from room temperature at the speed of 5 ℃/min, the temperature is kept for 10min, then the temperature is cooled to 500 ℃ at the speed of 5 ℃/min, and finally the temperature is cooled to room temperature along with the furnace to obtain TiO2/Bi4Ti3O12And (4) a composite light anode.
Example 4
Ultrasonically cleaning the FTO sheet by using deionized water, alcohol and isopropanol for 10min respectively to remove chemical oil stains, then placing the FTO sheet on filter paper, and naturally drying the FTO sheet for later use; 0.12mL of tetrabutyl titanate serving as a titanium source is added into 5mL of mineralizer of 6mol/L HCl to prepare TiO2The precursor solution is placed on a magnetic stirrer and stirred for 30min at the speed of 500 r/min; placing the cleaned FTO in the inner liner of the hydrothermal kettle, and enabling the conductive surface of the FTO to face downwards; adding the prepared precursor solution into a reaction kettle, putting the reaction kettle into an electric heating constant-temperature air blast drying oven, reacting for 4 hours at 150 ℃, and naturally cooling after the reaction is finished; opening the hydrothermal reaction kettle, taking out the FTO, repeatedly washing with deionized water, and naturally drying for 4 hours at a ventilation position to obtain TiO2(FTO) a substrate; 1.2976g of Bi (NO)3)3.5H2Adding O (excessive 7 percent) and 637.5 mu L tetrabutyl titanate into a DMF solvent according to a molar ratio, placing the mixture on a magnetic stirrer, stirring the mixture for 30min, adding 0.34g PVP, continuing stirring the mixture for 8h at the rotating speed of 300r/min to obtain Bi4Ti3O12Precursor sol; the obtained TiO is2(FTO) placing the substrate on a spin coater, performing spin coating by using the prepared sol, and setting a program to be a multi-step spin coating mode; after the spin coating is finished, drying the sample on a high-temperature heating table at 300 ℃ for 8 min; repeating the above process, and controlling the number of spin coating layers; carrying out high-temperature annealing on the obtained spin-coated sample, wherein the annealing mechanism is that a muffle furnace is heated to 600 ℃ from room temperature at the speed of 5 ℃/min, the temperature is kept for 20min, then the temperature is cooled to 500 ℃ at the speed of 5 ℃/min, and finally the temperature is cooled to room temperature along with the furnace to obtain TiO2/Bi4Ti3O12And (4) a composite light anode.
As can be seen from FIG. 1, Bi is spin-coated during the preparation process4Ti3O12Then, pure TiO2The diffraction peak of (FTO) is significantly reduced, and Bi4Ti3O12The diffraction peak of the compound is obviously enhanced, and the TiO can be proved2And Bi4Ti3O12And successfully compounding to form a heterojunction. FIG. 2 is an SEM image of a sample, in which (a) is pure TiO2It can be seen that the prepared sample is in the shape of a nanowire, and (b) is spin-coated Bi4Ti3O12The sample surface of the latter sample is similar to a worm shape and has higher specific surface area, which is beneficial to the transmission of electrons and provides more reactive sites. FIG. 3 shows the I-T curve measured after applying a bias of 0.5V to the sample, in which TiO is clearly seen2And Bi4Ti3O12After compounding, the photocurrent is obviously improved, and the lumen of the sample photoelectricity after compounding can reach 18 times of that of the sample before compounding.
The embodiments described above are merely preferred embodiments of the present invention, and should not be considered as limitations of the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
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