CN111261413B - Ti-doped alpha-Fe2O3Nanorod composite MOFs heterojunction photo-anode and preparation method and application thereof - Google Patents
Ti-doped alpha-Fe2O3Nanorod composite MOFs heterojunction photo-anode and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses Ti-doped alpha-Fe2O3The nano-rod composite MOFs heterojunction photo-anode and the preparation method and the application thereof, the method comprises the following steps: 1) mixing Ti3AlC2Stirring and reacting with hydrofluoric acid to obtain Ti3C2A solution; 2) mixing Ti3C2The solution is centrifugally cleaned and dried to obtain Ti3C2Powder; 3) mixing Ti3C2Dissolving the powder, ferric trichloride hexahydrate and urea in water to obtain Ti doped alpha-Fe2O3Precursor solution; 4) alpha-Fe is mixed2O3Carrying out hydrothermal reaction on the precursor solution to obtain a Ti-FeOOH nanorod array; 5) calcining the Ti-FeOOH nanorod array to obtain Ti-doped alpha-Fe2O3A nanorod array; 6) doping Ti with alpha-Fe2O3Carrying out chemical vapor deposition on the nanorod array to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode. The invention is in alpha-Fe2O3In-situ growth of MOFs layer on the nanorod array by alpha-Fe2O3The nanorod array structure improves the directional transmission capability of electrons, reduces the recombination probability of photo-generated electrons and holes through the MOFs layer, and obviously improves the photoelectric catalytic performance.
Description
Technical Field
The invention relates to the technical field of photoelectric anodes, in particular to a Ti-doped alpha-Fe 2O3 nanorod composite MOFs heterojunction photoelectric anode and a preparation method and application thereof.
Background
At present, the main energy consumed by the ball is fossil energy mainly comprising coal, petroleum and natural gas. From the total amount of fossil-based energy existing in the world, depletion of fossil-based energy becomes an unavoidable fact at the present consumption and expected rate of increase of consumption, and predictive data indicate that most of fossil-based energy will be exploited throughout this century. Therefore, the development of clean new energy is a common consensus in countries around the world. Solar energy is a natural energy which is abundant in resources and can be recycled, and compared with fossil energy, the solar energy has the advantages of being generally available, green, harmless and the like. At present, conversion of solar energy is mainly utilized through photothermal conversion, photoelectric conversion, photochemical conversion, and the like. From TiO2Electrodes were found to be useful for the photoelectric decomposition of water to produce H2And O2And opens a new era of application of solar energy in the field of environmental protection. A potential path is found for converting solar energy into stable and environment-friendly chemical energy, and a direction for decomposing water by utilizing solar energy through photoelectricity is opened up. However, the efficiency of the photoelectrocatalytic decomposition of water is severely limited because the water oxidation reaction is more difficult to occur because it involves a four electron transfer process. Therefore, the search for a stable and efficient photocatalyst is one of the key factors for realizing photocatalytic water decomposition.
alpha-Fe belonging to hexagonal system2O3Is a typical n-type semiconductor, and the forbidden bandwidth value is generally between 2.0 and 2.2 eV. Due to its favorable band gap, huge rock circle reserves, nontoxicity, and excellent resistance to light etching and structural stability of alkaline solutions,in addition, the d orbital of the Fe valence layer is not filled with electrons and can generate a plurality of electron transition mechanisms, so that the Fe valence layer has the advantages of excellent photoresponse capability and high redox activity and becomes one of a few semiconductors with prospects for photoelectrochemical water decomposition. However, the intrinsic conductivity is low, the specific surface area is small, and the surface catalytic sites are few, so that the recombination probability of electron-hole pairs is high, and a large number of holes are accumulated on the surface layer, so that the surface oxidation kinetics of the photo-anode film is slow, the photo-corrosion is severe, and the photo-catalytic efficiency of the photo-anode film is still limited. In recent years, many reports have been made on α -Fe2O3High valence doping elements are introduced to form oxygen vacancies to improve intrinsic conductivity, such as Ti (D.Yan, J.Liu, Z.Shang and H.Luo, Dalton transformations, 2017,46.), Sn (H.Han, S.Kment, F.Karlicky, L.Wang, A.Naldoni, P.Schmuki and R.Zboril, Small,2018,1703860.) to obtain Ti, alpha-Fe2O3And Sn alpha-Fe2O3(ii) a In addition, in alpha-Fe2O3Compounding heterogeneous semiconductor materials on the basis, e.g. BiVO4Introduction of alpha-Fe2O3(Applied Catalysis B: Environmental, 204 (2017: 127-) -133) to obtain the composite photo anode BiVO4/α-Fe2O3(ii) a Cobalt phosphate and Co3O4Introduction of Ti-doped Fe2O3(Advanced Functional Materials,2019, 29(11):1801902) to yield Co-Pi/Co3O4/Ti: Fe2O3. The above-mentioned technique is mainly characterized by that it utilizes the introduction of high-valence doped element to raise intrinsic conductivity or utilizes other semiconductor material and alpha-Fe2O3The heterojunction is formed to promote the separation of electron-hole pairs, but still has the problems of complicated process, difficult operation and high heterojunction interface charge transfer barrier, and limits the water decomposition performance of the photoanode.
Disclosure of Invention
The invention aims to provide Ti doped alpha-Fe2O3The preparation method of the Ti-doped alpha-Fe 2O3 nanorod composite MOFs heterojunction photo-anode is simple in process and strong in operability, and the prepared Ti-doped alpha-Fe 2O3 nanorod composite MOFs heterojunction photo-anode is preparedα-Fe2O3The nano-rod composite MOFs heterojunction photo-anode has strong photoelectrocatalysis water oxidation capability.
In order to achieve the aim, the invention designs a Ti-doped alpha-Fe2O3The Ti is doped with alpha-Fe2O3The nano-rod composite MOFs heterojunction photo-anode is a compact and continuous thin film; the Ti is doped with alpha-Fe2O3alpha-Fe in electronic structure of nano-rod composite MOFs heterojunction photo-anode2O3In intimate contact with the MOFs.
As a preferred embodiment, the Ti is doped with alpha-Fe2O3The illumination intensity of the nano-rod composite MOFs heterojunction photo-anode is 100W-cm-2And a photocurrent density of 0.8-2.2 mA-cm under a voltage of 1.3V-2。
The invention also provides the Ti-doped alpha-Fe2O3The preparation method of the nanorod composite MOFs heterojunction photo-anode comprises the following steps:
1) mixing Ti3AlC2Stirring and reacting with hydrofluoric acid to obtain Ti3C2A solution;
2) mixing Ti3C2The solution is centrifugally cleaned and dried to obtain Ti3C2Powder;
3) mixing Ti3C2Dissolving the powder, ferric trichloride hexahydrate and urea in water, and stirring to obtain Ti-doped alpha-Fe2O3Precursor solution;
4) alpha-Fe is mixed2O3Carrying out hydrothermal reaction on the precursor solution to obtain a Ti-FeOOH nanorod array;
5) calcining the Ti-FeOOH nanorod array to obtain Ti-doped alpha-Fe2O3A nanorod array;
6) doping Ti with alpha-Fe2O3Carrying out chemical vapor deposition on the nanorod array to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
Preferably, in the step 1), Ti3AlC2The solid-liquid mass ratio of the hydrofluoric acid to the hydrofluoric acid is 1: 5-20, and the stirring reaction time is 24-48 h.
Preferably, in the step 2), Ti is added3C2The solution was washed with water by centrifugation and then dried in a vacuum oven under vacuum.
Preferably, in the step 3), Ti3C2The mass ratio of the powder, ferric trichloride hexahydrate, urea and water is (0.01-0.03): (0.5-1.0): (0.1-0.5): 50.
as a preferred embodiment, in the step 4), first, placing conductive glass in a reaction kettle, wherein a conductive surface of the conductive glass faces to an inner wall of the reaction kettle; doping Ti with alpha-Fe2O3Transferring the precursor solution into the reaction kettle, and sealing; then carrying out hydrothermal reaction at the temperature of 80-120 ℃, wherein the time of the hydrothermal reaction is 2-8 h; and finally, washing and drying the obtained product in sequence to obtain the Ti-FeOOH nanorod array.
Preferably, in the step 5), the calcining treatment is specifically heating the Ti-FeOOH nanorod array to 400-700 ℃ in an air atmosphere, preserving heat for 1-4 h, heating to 600-900 ℃, and preserving heat for 5-30 min to obtain the Ti-doped alpha-Fe2O3A nanorod array.
Preferably, in the step 6), Ti is doped with alpha-Fe2O3The nanorod array is reversely buckled on a crucible containing 2,6 naphthalenedicarboxylic acid, the crucible is placed in the center of a tube furnace, and argon is introduced for chemical vapor deposition.
Preferably, the temperature of the chemical vapor deposition is 300-400 ℃, and the time is 30-60 min; then washing and drying the product in sequence to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
The invention also provides Ti doped alpha-Fe2O3The application of the nanorod composite MOFs heterojunction photo-anode is characterized in that: the Ti is doped with alpha-Fe2O3Nano-rod composite MOFs heterojunction photo-anode for photocatalytic componentHydrolyzing the Ti doped with alpha-Fe2O3The nanorod composite MOFs heterojunction photo-anode is prepared by the method.
Compared with the prior art, the invention has the following advantages:
firstly, the main body photoelectrocatalysis material adopted by the invention is alpha-Fe2O3，α-Fe2O3The photoproduction cavity has stronger oxidation capability, so that the photogeneration cavity has good photoelectrocatalysis water decomposition capability; meanwhile, the invention is in alpha-Fe2O3In-situ growth of MOFs layer on the nanorod array by alpha-Fe2O3The nanorod array structure improves the directional transmission capability of electrons, reduces the recombination probability of photo-generated electrons and holes through the MOFs layer, and obviously improves the photoelectric catalytic performance.
Secondly, the invention firstly adopts a hydrothermal method to obtain a Ti-FeOOH nanorod array, and further carries out heat treatment to obtain Ti-doped alpha-Fe2O3The nano-rod array is adopted, and then the MOFs layer is grown in situ by adopting a chemical vapor deposition method to prepare Ti-doped alpha-Fe2O3The nano-rod composite MOFs heterojunction photo-anode can effectively inhibit the aggregation of MOFs particles and control the growth of the MOFs particles, so the method is simple in process and good in operability.
Thirdly, the invention adopts high valence Ti ions to dope to obtain Ti alpha-Fe2O3Compared with pure iron oxide, the iron oxide has more oxygen vacancies, can better conduct carriers, has higher conductivity, and thus has better water decomposition capability through photoelectrocatalysis.
Fourthly, the Ti doped alpha-Fe prepared by the invention2O3The nano-rod composite MOFs heterojunction photo-anode is detected: at 100 W.cm-2The light intensity and the photocurrent density at 1.3V relative to the standard hydrogen electrode are 0.8-2.2 mA-cm-2。
Fifthly, the Ti doped alpha-Fe prepared by the invention2O3The nanorod composite MOFs heterojunction photo-anode can obviously improve the intrinsic point arrival rate of iron oxide, simultaneously reduce the charge transfer potential barrier of a heterojunction interface, obviously improve the separation of photo-generated electron hole pairs in the photocatalysis process, and has high efficiencyThe capability of photoelectrocatalysis to decompose water.
Drawings
FIG. 1 is Ti doped α -Fe prepared in example 22O3SEM image of nano-rod composite MOFs heterojunction photo-anode;
FIG. 2 is Ti doped α -Fe prepared in example 22O3TEM image of nanorod composite MOFs heterojunction photo-anode;
FIG. 3 shows Ti doped α -Fe prepared in example 22O3And (3) a chopping current curve of the nanorod composite MOFs heterojunction photo-anode.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
this example is Ti doped with alpha-Fe2O3The preparation method of the nanorod composite MOFs heterojunction photo-anode comprises the following steps:
1) to Ti3AlC2Slowly dripping hydrofluoric acid and Ti into the solution3AlC2The solid-liquid mass ratio of the titanium oxide to hydrofluoric acid is 1:5, and the stirring is continued for 24 hours to obtain Ti3C2A solution;
2) the obtained Ti3C2Centrifugally cleaning the solution by using deionized water, and drying the solution in a vacuum drying oven to obtain Ti3C2Powder;
3) 0.5 part by mass of ferric trichloride hexahydrate and 0.01 part by mass of Ti3C2And 0.1 part by mass of urea are dissolved in 50 parts by mass of deionized water and stirred for 5min to obtain Ti-doped alpha-Fe2O3Precursor solution;
4) placing conductive glass in a reaction kettle, wherein a conductive surface of the conductive glass faces to the inner wall of the reaction kettle; then doping Ti with alpha-Fe2O3Transferring the precursor solution into the reaction kettle, and sealing; then carrying out hydrothermal reaction at the temperature of 80 ℃, wherein the hydrothermal reaction time is 2 hours, and washing and drying to obtain a Ti-FeOOH nanorod array; the lining of the reaction kettle is made of polytetrafluoroethylene;
5) placing the Ti-FeOOH nanorod array in a crucible, heating to 400 ℃ in air atmosphere, preserving heat for 1h, heating to 600 ℃, and preserving heat for 5min to obtain Ti-doped alpha-Fe2O3A nanorod array;
6) doping the Ti with alpha-Fe2O3The nanorod array is reversely buckled on a crucible containing 0.1 part by mass of 2, 6-naphthalenedicarboxylic acid, the crucible is placed in the center of a tube furnace, argon is introduced, chemical vapor deposition is carried out at 300 ℃ for 30min, and then the Ti-doped alpha-Fe is obtained by washing and drying2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
Example 2
This example is Ti doped with alpha-Fe2O3The preparation method of the nanorod composite MOFs heterojunction photo-anode comprises the following steps:
1) to Ti3AlC2Slowly dripping hydrofluoric acid and Ti into the solution3AlC2The solid-liquid mass ratio of the titanium oxide to hydrofluoric acid is 1:10, and the stirring is continued for 36 hours to obtain Ti3C2A solution;
2) the obtained Ti3C2Centrifugally cleaning the solution by using deionized water, and drying the solution in a vacuum drying oven to obtain Ti3C2Powder;
3) 1 part by mass of ferric chloride hexahydrate and 0.02 part by mass of Ti3C2And 0.5 part by mass of urea are dissolved in 50 parts by mass of deionized water and stirred for 20min to obtain Ti-doped alpha-Fe2O3Precursor solution;
4) placing conductive glass in a reaction kettle, wherein a conductive surface of the conductive glass faces to the inner wall of the reaction kettle; then doping Ti with alpha-Fe2O3Transferring the precursor solution into the reaction kettle, and sealing; then carrying out hydrothermal reaction at 95 ℃ for 5h, and washing and drying to obtain a Ti-FeOOH nanorod array;
the lining of the reaction kettle is made of polytetrafluoroethylene;
5) placing the Ti-FeOOH nanorod array in a crucibleHeating to 550 ℃ in air atmosphere, preserving heat for 2h, heating to 750 ℃ again, and preserving heat for 15min to obtain Ti-doped alpha-Fe2O3A nanorod array;
6) doping the Ti with alpha-Fe2O3The nanorod array is reversely buckled on a crucible containing 0.2 mass part of 2, 6-naphthalenedicarboxylic acid, the crucible is placed in the center of a tube furnace, argon is introduced, chemical vapor deposition is carried out at 350 ℃, the chemical vapor deposition time is 45min, and then washing and drying treatment are carried out to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
Example 3
This example is Ti doped with alpha-Fe2O3The preparation method of the nanorod composite MOFs heterojunction photo-anode comprises the following steps:
1) to Ti3AlC2Slowly dripping hydrofluoric acid and Ti into the solution3AlC2The solid-liquid mass ratio of the titanium oxide to hydrofluoric acid is 1:20, and the stirring is continued for 48 hours to obtain Ti3C2A solution;
2) the obtained Ti3C2Centrifugally cleaning the solution by using deionized water, and drying the solution in a vacuum drying oven to obtain Ti3C2Powder;
3) 0.75 parts by mass of ferric trichloride hexahydrate and 0.03 parts by mass of Ti3C2And 0.3 part by mass of urea are dissolved in 50 parts by mass of deionized water and stirred for 30min to obtain Ti-doped alpha-Fe2O3Precursor solution;
4) placing conductive glass in a reaction kettle, wherein a conductive surface of the conductive glass faces to the inner wall of the reaction kettle; then doping Ti with alpha-Fe2O3Transferring the precursor solution into the reaction kettle, and sealing; then carrying out hydrothermal reaction at 120 ℃ for 8h, and washing and drying to obtain a Ti-FeOOH nanorod array;
the lining of the reaction kettle is made of polytetrafluoroethylene;
5) placing the Ti-FeOOH nanorod array in a crucible, heating to 700 ℃ in air atmosphere, preserving heat for 4h, and then carrying out heat preservationHeating to 900 ℃, and preserving the heat for 30min to obtain Ti doped alpha-Fe2O3A nanorod array;
6) doping the Ti with alpha-Fe2O3The nanorod array is reversely buckled on a crucible containing 0.3 mass part of 2, 6-naphthalenedicarboxylic acid, the crucible is placed in the center of a tube furnace, argon is introduced, chemical vapor deposition is carried out at 400 ℃ for 60min, and then washing and drying treatment are carried out to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
Effect example 1:
ti prepared in example 2 was doped with alpha-Fe2O3And (3) carrying out Scanning Electron Microscope (SEM) test and Transmission Electron Microscope (TEM) test on the nanorod composite MOFs heterojunction photo-anode. As can be seen from FIG. 1, Ti is doped with alpha-Fe2O3The nano-rod composite MOFs heterojunction photo-anode forms a compact and continuous thin film; as can be seen from FIG. 2, α -Fe is doped in the Ti2O3alpha-Fe in nano-rod composite MOFs heterojunction photo-anode2O3In intimate contact with MOFs such that the Ti is doped with alpha-Fe2O3The nanorod composite MOFs heterojunction photoanode has a low charge transfer potential barrier, is obviously beneficial to separation of electron hole pairs, and achieves high water decomposition performance by photoelectrocatalysis.
Effect example 2
Ti prepared in example 2 was doped with alpha-Fe2O3Performing a photoelectrocatalysis test on the nanorod composite MOFs heterojunction photoanode, and performing the photoelectrocatalysis test on a CHI 660 electrochemical workstation equipped with a standard three-electrode to prepare the Ti-doped alpha-Fe2O3The nanorod composite MOFs heterojunction photo-anode is used as a working electrode, the Pt foil is used as a counter electrode, and the saturated Ag/AgCl electrode is used as a reference electrode. The detection method comprises the following steps: firstly introducing nitrogen into NaOH solution for half an hour to remove oxygen in the NaOH solution, taking the NaOH solution as an electrolyte medium, and then introducing nitrogen into the NaOH solution for half an hour, wherein the geometric area of the NaOH solution is 0.25cm2Ti doped with alpha-Fe2O3The nanorod composite MOFs heterojunction photoanode is immersed in 50mL of NaOH (pH 13.7) solution with the concentration of 1mol/L and then immersed in the solution at 100W-cm-2Die ofAnd carrying out a photoelectrocatalysis test under the irradiation of simulated sunlight and at 1.3V relative to a standard hydrogen electrode to obtain the photocurrent density. As can be seen from FIG. 3, Ti is doped with alpha-Fe2O3The nano-rod composite MOFs heterojunction photo-anode is 100W-cm-2The light intensity and the photocurrent of the standard hydrogen electrode at 1.3V are 0.8-2.2 mA-cm-2And has excellent water decomposing performance by photoelectrocatalysis.
The above description is only an embodiment of the present invention, and it should be noted that the details which are not described in the present specification are the prior art which is known to those skilled in the art, and any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (10)
1. Ti-doped alpha-Fe2O3The nanorod composite MOFs heterojunction photo-anode is characterized in that: the Ti is doped with alpha-Fe2O3The nano-rod composite MOFs heterojunction photo-anode is a compact and continuous thin film, and the Ti is doped with alpha-Fe2O3The illumination intensity of the nano-rod composite MOFs heterojunction photo-anode is 100W-cm-2And a photocurrent density of 0.8-2.2 mA-cm under a voltage of 1.3V-2；
The Ti is doped with alpha-Fe2O3The nanorod composite MOFs heterojunction photo-anode is prepared by the following method:
1) mixing Ti3AlC2Stirring and reacting with hydrofluoric acid to obtain Ti3C2A solution;
2) mixing Ti3C2The solution is centrifugally cleaned and dried to obtain Ti3C2Powder;
3) mixing Ti3C2Dissolving the powder, ferric trichloride hexahydrate and urea in water, and stirring to obtain Ti-doped alpha-Fe2O3Precursor solution;
4) alpha-Fe is mixed2O3Carrying out hydrothermal reaction on the precursor solution to obtain a Ti-FeOOH nanorod array;
5) mixing Ti-FeCalcining OOH nano-rod array to obtain Ti-doped alpha-Fe2O3A nanorod array;
6) doping Ti with alpha-Fe2O3Carrying out chemical vapor deposition on the nanorod array to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
2. Ti-doped alpha-Fe2O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of:
1) mixing Ti3AlC2Stirring and reacting with hydrofluoric acid to obtain Ti3C2A solution;
2) mixing Ti3C2The solution is centrifugally cleaned and dried to obtain Ti3C2Powder;
3) mixing Ti3C2Dissolving the powder, ferric trichloride hexahydrate and urea in water, and stirring to obtain Ti-doped alpha-Fe2O3Precursor solution;
4) alpha-Fe is mixed2O3Carrying out hydrothermal reaction on the precursor solution to obtain a Ti-FeOOH nanorod array;
5) calcining the Ti-FeOOH nanorod array to obtain Ti-doped alpha-Fe2O3A nanorod array;
6) doping Ti with alpha-Fe2O3Carrying out chemical vapor deposition on the nanorod array to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
3. Ti doped α -Fe according to claim 22O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of: in the step 1), Ti3AlC2The solid-liquid mass ratio of the hydrofluoric acid to the hydrofluoric acid is 1: 5-20, and the stirring reaction time is 24-48 h.
4. Ti doped α -Fe according to claim 22O3Preparation of nano-rod composite MOFs heterojunction photo-anodeThe method is characterized in that: in said step 2), Ti3C2The solution was washed with water by centrifugation and then dried in a vacuum oven under vacuum.
5. Ti doped α -Fe according to claim 22O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of: in said step 3), Ti3C2The mass ratio of the powder, ferric trichloride hexahydrate, urea and water is (0.01-0.03): (0.5-1.0): (0.1-0.5): 50.
6. ti doped α -Fe according to claim 22O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of: in the step 4), firstly, conductive glass is placed in a reaction kettle, and a conductive surface of the conductive glass faces to the inner wall of the reaction kettle; doping Ti with alpha-Fe2O3Transferring the precursor solution into the reaction kettle, and sealing; then carrying out hydrothermal reaction at the temperature of 80-120 ℃, wherein the time of the hydrothermal reaction is 2-8 h; and finally, washing and drying the obtained product in sequence to obtain the Ti-FeOOH nanorod array.
7. Ti doped α -Fe according to claim 22O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of: in the step 5), the calcining treatment is specifically to heat the Ti-FeOOH nanorod array to 400-700 ℃ in the air atmosphere, preserve heat for 1-4 h, heat to 600-900 ℃ again, and preserve heat for 5-30 min to obtain Ti-doped alpha-Fe2O3A nanorod array.
8. Ti doped α -Fe according to claim 22O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of: in the step 6), Ti is doped with alpha-Fe2O3The nanorod array is reversely buckled on a crucible containing 2,6 naphthalenedicarboxylic acid, the crucible is placed in the center of a tube furnace, and argon is introduced for chemical vapor deposition.
9. Ti doped α -Fe according to claim 82O3The preparation method of the nanorod composite MOFs heterojunction photo-anode is characterized by comprising the following steps of: the temperature of the chemical vapor deposition is 300-400 ℃, and the time is 30-60 min; then washing and drying the product in sequence to obtain Ti-doped alpha-Fe2O3And (3) compounding the nano-rods with the MOFs heterojunction photo-anode.
10. Ti-doped alpha-Fe2O3The application of the nanorod composite MOFs heterojunction photo-anode is characterized in that: the Ti is doped with alpha-Fe2O3The nanorod composite MOFs heterojunction photoanode is used for photocatalytic decomposition of water, and the Ti is doped with alpha-Fe2O3The nanorod composite MOFs heterojunction photoanode is prepared by the method of any one of claims 2 to 9.
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