CN113941337B - Strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst and preparation method and application thereof - Google Patents
Strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst and preparation method and application thereof Download PDFInfo
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000001257 hydrogen Substances 0.000 title claims abstract description 62
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 57
- 239000003054 catalyst Substances 0.000 title claims abstract description 30
- 229910052684 Cerium Inorganic materials 0.000 title claims abstract description 26
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 22
- 239000006104 solid solution Substances 0.000 title claims abstract description 21
- YPQJHZKJHIBJAP-UHFFFAOYSA-N [K].[Bi] Chemical compound [K].[Bi] YPQJHZKJHIBJAP-UHFFFAOYSA-N 0.000 title claims abstract description 16
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- 238000000034 method Methods 0.000 claims abstract description 16
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- 238000001354 calcination Methods 0.000 claims abstract description 10
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- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 17
- PPNKDDZCLDMRHS-UHFFFAOYSA-N dinitrooxybismuthanyl nitrate Chemical compound [Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PPNKDDZCLDMRHS-UHFFFAOYSA-N 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 10
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- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
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- 230000002195 synergetic effect Effects 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
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- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
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- 229960001259 diclofenac Drugs 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical compound Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
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- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/843—Arsenic, antimony or bismuth
- B01J23/8437—Bismuth
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Abstract
The invention belongs to the fields of inorganic chemistry, energy technology and catalysis, and particularly relates to a strong magnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst, and a preparation method and application thereof. The preparation method of the piezoelectric hydrogen production catalyst comprises the following steps: mixing a mixture containing a Fe source, a Bi source, a K source and a Ce source with ethylene glycol to obtain a mixed solution; then adding tartaric acid, continuously stirring in a heating state until the tartaric acid is completely dissolved to form gel, and drying the gel to obtain a CKBF precursor; and calcining the obtained CKBF precursor to obtain the CKBF piezoelectric hydrogen production catalyst. The preparation method of the strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst provided by the invention is simple in process, and the prepared material is good in thermal stability and high in catalytic activity, and compared with BiFeO prepared by the traditional method3Has strong magnetism, is easier to recycle and has stronger hydrogen production effect.
Description
Technical Field
The invention belongs to the fields of inorganic chemistry, energy technology and catalysis, and particularly relates to a strong magnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst, and a preparation method and application thereof.
Background
At present, with the continuous consumption of fossil energy, the demand of people for clean energy is continuously increasing. Hydrogen energy is regarded as the most promising clean energy in the 21 st century, and can be effectively utilized to effectively alleviate the problems of environmental pollution and energy consumption. Generally, hydrogen can be directly prepared by decomposing water through sunlight, but the problems of no response in darkness, low sunlight utilization rate and the like become limiting conditions for the development of photocatalytic hydrogen production technology. In addition, the water electrolysis technology is also a hot topic of hydrogen production in recent years, however, the large consumption of electric energy also becomes a significant defect of the technology. Therefore, the invention of a simple and efficient hydrogen production technology is urgent.
In recent years, multiferroic materials have received much attention because they have multiple properties at the same time. BiFeO, a classic multiferroic material with both ferroelectric and ferromagnetic properties3Under the action of stress, local dipole moment of material is polarized, and the interior of material isThe part generates a potential difference to form a polarized electric field, thereby converting mechanical energy into electric energy, namely the piezoelectric effect. The piezoelectric electric field can promote the migration of free electrons on the material to cause the separation of electron holes, and the separated charges can quickly and efficiently decompose water, so that the piezoelectric electric field has great potential in the field of hydrogen production. Typically, BiFeO 3The piezoelectricity of the composite material mainly comes from the fact that ferroelectric polarization along the (111) direction is formed by hybridization between 6s lone pair electrons of the A-site bismuth ions and 2p orbitals of oxygen atoms, but due to the fact that bismuth element can be partially volatilized in the high-temperature sintering process, the appearance of mixed phases and leakage current is caused, and the piezoelectric performance is affected; the substitution of the A site of the equivalent element can effectively improve the crystallinity of the material and reduce the leakage current, thereby improving the piezoelectric property. Meanwhile, BiFeO3The magnetism comes from remanent magnetic moment generated by spin arrangement of B-site iron ions, but the spin is inclined at a small angle and forms a periodic helical structure as long as 62 nm, the macroscopic net magnetic moment of the material is counteracted by the structure, and although the substitution of B-site elements can inhibit the periodic helical structure to a certain extent, the crystallinity cannot be improved, and even a mixed phase is brought. Therefore, the improvement of both piezoelectric performance and magnetic response on the basis of the improvement of the crystalline phase of the material is a key problem to be solved at present.
Disclosure of Invention
The invention aims to provide a preparation method of a strong magnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst. The method is simple and easy to implement, and the obtained hydrogen production catalyst has strong magnetism and is easy to recover, thereby providing a powerful basis for industrial application.
The invention also aims to provide the ferromagnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst prepared by the method. The piezoelectric hydrogen production catalyst is changed to use ultrasonic as a piezoelectric driving force, and after 80 min of ultrasonic treatment, the hydrogen production amount can reach 515 mu mol/g which is far higher than 274 mu mol/g of undoped bismuth titanate.
The invention further aims to provide the application of the ferromagnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst in the field of hydrogen production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst specifically comprises the following steps:
step 1: weighing Fe (NO)3)3•9H2O，Bi(NO3)3 •5H2O，KNO3And Ce (NO)3)3•6H2O, mixing with ethylene glycol to obtain a mixed solution;
step 2: adding tartaric acid into the mixed solution obtained in the step 1, continuously stirring the mixed solution in a heating state until the tartaric acid is completely dissolved to form gel, and drying the gel to obtain a CKBF precursor;
and step 3: calcining the obtained CKBF precursor to obtain the CKBF piezoelectric hydrogen production catalyst;
step 1 Fe (NO)3)3•9H2O，Bi(NO3)3 •5H2O，KNO3And Ce (NO)3)3•6H2The dosage of O satisfies that the ratio of the sum of the dosage of Ce, K and Bi substances to the dosage of Fe substance is 1: 1; wherein Bi (NO) 3)3 •5H2O，KNO3And Ce (NO)3)3•6H2The molar ratio of Bi, K and Ce in the mixture of O is 70-100%, 0-15% and 0-15%, preferably Bi (NO)3)3 •5H2O，KNO3And Ce (NO)3)3•6H2The molar ratios of Bi, K and Ce in the mixture of O are respectively 90-60%, 5-20% and 5-20%; more preferably 85 to 75%, 5 to 15% and 5 to 15%, most preferably 80%, 10% and 10%.
Fe (NO) in step 13)3•9H2The molar volume ratio of O to ethylene glycol is 0.01 mol: 20-50 mL, preferably 0.01 mol: 40 mL.
In the step 2, the heating temperature is 70-90 DEGoAnd C, stirring for 1-3 hours.
The amount of tartaric acid substance in step 2 is the same as the sum of the amounts of heavy metal cations in step 1The sum of the amounts of the substances is Fe (NO)3)3•9H2O，Bi(NO3)3 •5H2O，KNO3And Ce (NO)3)3•6H2Sum of the amounts of substances of O.
In the step 2, the drying temperature is 60-80 ℃, and the drying time is 8-12 h.
And 3, calcining at 500-600 ℃ for 1-3 h. Preferably, the temperature rise program during the calcination is set to be 5-15 ℃/min.
And 3, calcining the CKBF precursor, preferably naturally cooling, washing with ethanol and water for several times, and drying to obtain the final CKBF piezoelectric hydrogen production catalyst.
The strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst is prepared by the method, and the chemical formula of the catalyst is Ce xKyBi(1-x-y)FeO3（CKBF），0.05≤x≤0.2，0.05≤y≤0.2。
The strong magnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst is applied to the field of hydrogen production.
The A position is replaced by the A position of an aliovalent element, the crystallinity and the structural distortion of the material are enhanced, the piezoelectric response is improved, and the valence state compensation of the B position element can be caused, so that the valence state of the B position element is changed, and the aim of enhancing ferromagnetism is fulfilled; meanwhile, the multi-element formed by multiple elements easily causes the appearance of solid solution state structures with different end materials in the system, and the appearance of the solid solution not only can inhibit the generation of heterogeneous phases, but also can construct a homomorphic phase boundary and improve the piezoelectric performance. Aiming at the key problems existing in the prior art and the characteristic of A-site doping, the invention adopts the simultaneous introduction of equivalence (Ce) on the A site3+) And aliovalent (K)+) Element partially replaces the original Bi3+Thus being BiFeO3The high-efficiency hydrogen production and the simple recovery of the base piezoelectric material provide feasible bases. Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a preparation method of a strong magnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst.On one hand, rare earth metal Ce with equal valence and good thermal stability is selected3+The bismuth ion at the A position is replaced, the crystallinity of the material is improved, the structural symmetry is damaged, the structural distortion is enhanced, and the material is easier to generate a polarization electric field under the driving of pressure, so that the piezoelectric hydrogen production effect is improved. On the other hand, selecting alkali metals K with different valence states +Bismuth ions at A site are replaced, valence change of iron ions is initiated, magnetic response is increased, and the formation of solid solution form can be initiated by the existence of multiple elements and multiple components, so that the generation of miscellaneous items is inhibited, and a morphotropic phase boundary is constructed to improve the piezoelectric performance. The method comprises the steps of chemically fusing raw materials in a proper proportion, adding tartaric acid as a chelating agent, heating to form gel, drying, grinding and calcining at high temperature to obtain a sample, and successfully preparing BiFeO3Two elements of Ce and K are introduced, so that the aims of simultaneously improving the crystal phase structure, increasing the piezoelectric property and improving the magnetic response are fulfilled, and the method has great significance for popularizing the piezoelectric hydrogen production technology in industrial application.
Drawings
FIG. 1 (a) shows BiFeO prepared in example 1 of the present invention3And an X-ray diffraction pattern of CKBF; (b) is a scanning electron micrograph of CKBF-10% prepared in embodiment 1 of the present invention.
FIG. 2 is a microscope image of the piezoelectric response stress of CKBF-10% prepared in embodiment 1 of the present invention
FIG. 3 shows a magnetic loop for preparing CKBF-10% in accordance with embodiment 1 of the present invention.
FIG. 4 shows BiFeO prepared in embodiment 1 of the present invention3And piezoelectric hydrogen production performance diagram of CKBF.
FIG. 5 shows BiFeO prepared in embodiment 1 of the present invention3、KBF-10%, CBF-10% and CKBF-10%.
FIG. 6 shows that hydrogen production and pollutant degradation are simultaneously achieved by using CKBF-10% prepared in embodiment 1 of the present invention.
FIG. 7 shows BiFeO prepared in embodiment 1 of the present invention3And CKBF-10% piezoelectric response current versus time plot.
FIG. 8 is a graph (a) of the performance of recycling hydrogen production from CKBF-10% produced in embodiment 1 of the present invention and a schematic diagram (b) of magnetic separation and recovery.
Detailed Description
The invention is further described with reference to the accompanying drawings, and the following examples are only used to illustrate the technical solutions of the invention more clearly, and should not be taken as limiting the scope of the invention.
Example 1
The preparation method comprises the following specific steps:
step 1: 0.007 to 0.01 mol of Bi (NO) is weighed out respectively3)3 •5H2O, 0-0.0015 mol KNO3And 0 to 0.0015 mol of Ce (NO)3)3•6H2Adding O into a conical flask containing 40 mL of glycol, respectively accounting for 70% -100%, 0-15% and 0-15% of Bi, K and Ce, and uniformly stirring. Then 0.01 mol of Fe (NO) is weighed out3)3•9H2O is added to the above mixed solution and stirring is continued until the solid is completely dissolved to obtain a clear red-brown solution.
And 2, step: 3.002 g tartaric acid was added to the reddish-brown clear solution obtained in step 1, and the flask was then transferred to a thermostatted water bath 80 oC after 2 hours of stirring in a water bath, the gel obtained is transferred to a watch glass at 70oAnd C, drying overnight to form xerogel solid, and then grinding to obtain CKBF precursor powder. The precursor powder of CKBF is put in 550oCalcining for 2 h under C to obtain CKBF solid.
Control of Bi (NO)3)3 •5H2The addition amount of O is 0.01 mol, KNO3And Ce (NO)3)3•6H2The adding amount of O is 0 mol, and the obtained CKBF is recorded as BiFeO3(ii) a Control of Bi (NO)3)3 •5H2The addition amount of O is 0.009mol, KNO3And Ce (NO)3)3•6H2The amount of O added was 0.0005 mol each and the resulting CKBF was denoted as Ce0.05K0.05Bi0.9FeO3(CKBF-5%); control of Bi (NO)3)3 •5H2The addition of O is 0.008 mol, KNO3And Ce (NO)3)3•6H2The addition of O is 0.001 mol respectively, and the CKBF obtained is recorded as Ce0.1K0.1Bi0.8FeO3(CKBF-10%); control of Bi (NO)3)3 •5H2The addition of O is 0.007 mol, KNO3And Ce (NO)3)3•6H2The addition of O is 0.0015 mol respectively, and the obtained CKBF is recorded as Ce0.15K0.15Bi0.7FeO3(CKBF-15%). Control of Bi (NO)3)3 •5H2The addition amount of O is 0.009mol, KNO3Is added in an amount of 0 mol, Ce (NO)3)3•6H2The adding amount of O is 0.001 mol, and the obtained CKBF is recorded as CBF-10%; control of Bi (NO)3)3 •5H2The addition amount of O is 0.009mol, KNO3Is added in an amount of 0.001 mol, Ce (NO) 3)3•6H2The amount of O added is 0 mol, and the obtained CKBF is recorded as KBF-10%.
FIG. 1 (a) is an X-ray diffraction pattern of a piezoelectric hydrogen production catalyst prepared in example 1 of the present invention, from which BiFeO produced is observed3The standard card number JCPDS number 14-0181 is well matched, and no extra peak is added when two elements Ce and K are added, which means that a solid solution is formed. FIG. 1 (b) is a scanning electron micrograph of CKBF-10% of the CKBF prepared according to embodiment 1 of the present invention, from which it can be seen that the morphology of the prepared CKBF-10% is irregular particles. Fig. 2 is a microscope image of the piezoelectric response of CKBF-10%, from which it can be seen that the saturated phase voltage loop exhibits significant hysteresis and 180 ° phase switching, and the amplitude voltage hysteresis loop exhibits a similar "butterfly" appearance, which is a good indication that CKBF-10% has excellent piezoelectric properties. FIG. 3 is a graph of the magnetic force of CKBF-10% prepared according to the present invention, in which it is seen that the magnetization value of CKBF-10% in a saturated state is about 6.3378 emu/g, indicating that CKBF-10% has excellent magnetic properties.
Example 2
5 mg of each of the piezoelectric hydrogen production catalysts having different Ce and K doping contents prepared in example 1 were weighed, and then the catalysts were transferred to a closed tube containing 5 mL of 0.5 mol/L sodium sulfite solution, and nitrogen was introduced for 15 minutes before the reaction to remove air interference. Then the reaction solution is transferred to an ultrasonic cleaner with 80W and 40 kHz to carry out piezoelectric hydrogen production reaction, samples are taken at certain time, and the production amount of the hydrogen is measured.
FIG. 4 shows the catalyst BiFeO for piezoelectric hydrogen production prepared in embodiment 1 of the present invention3And the piezoelectric hydrogen production performance diagram of CKBF-5%, CKBF-10% and CKBF-15%. As is apparent from the graph, the hydrogen production gradually increased with the increase of the reaction time. In addition, CKBF with different Ce and K doping amounts is obviously seen, the piezoelectric hydrogen production effect has obvious optimal value of CKBF-10%, and the hydrogen yield reaches 515 mu mol/g after 80 minutes of ultrasonic processing, which is far higher than BiFeO3274. mu. mol/g of (1).
FIG. 5 shows the piezoelectric hydrogen production catalyst BiFeO prepared in embodiment 1 of the present invention3KBF-10%, CBF-10% and CKBF-10%. As is evident from the figure, the doping of Ce alone and the doping of K alone will yield BiFeO3The hydrogen production performance of the piezoelectric material is respectively improved from 274 mu mol/g to 330 mu mol/g and 314 mu mol/g. The piezoelectric hydrogen production performance of CKBF-10% is 515 mu mol/g, which is much higher than that of CBF-10% and CKBF-10%, which shows that BiFeO is improved by obvious synergistic effect3The crystal phase structure greatly enhances the piezoelectric hydrogen production performance.
Example 3
5 mg of CKBF-10% prepared in embodiment example 1 was weighed into a closed tube, and then 5 mL of a contaminant mixture solution (5 mg/L carbamazepine, 5 mg/L ciprofloxacin, and 5 mg/L diclofenac) was added. Nitrogen was passed for 15 minutes before the reaction to exclude interference of hydrogen in air. Then transferred into an ultrasonic cleaner with the frequency of 80W and 40 kHz, and aims to use the pollutants as sacrificial agents for piezoelectric hydrogen production so as to realize the simultaneous progress of the piezoelectric hydrogen production reaction and the degradation of the pollutants. Sampling is carried out at certain intervals, the yield of hydrogen is measured, and the removal rate of carbamazepine, ciprofloxacin and diclofenac acid in the solution after the final reaction is detected.
As is apparent from FIG. 6, as the ultrasonic reaction time is prolonged to 80 min, the hydrogen yield is gradually increased to 334 μmol/g, at this time, the removal effect of carbamazepine is 62%, the removal rate of ciprofloxacin is 78%, and the removal rate of diclofenac acid reaches 83%. The CKBF-10% can effectively utilize pollutants, the synergistic effect of pollutant degradation and hydrogen production is realized, and the wide application of the CKBF-10% piezoelectric hydrogen production catalyst is well reflected.
Example 4
The strong magnetic cerium and potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst CKBF-10% and BiFeO provided in the specific embodiment 1 were tested by using 0.5 mol/L sodium sulfate solution as a conductive solution, a platinum wire as a counter electrode and a calomel electrode as a reference electrode3The piezoelectric response current versus time curve of (a).
FIG. 7 shows that the transient current density of CKBF-10% is much higher than that of BiFeO3. This indicates that the conductivity of the formed CKBF-10% solid solution is much higher than that of pure BiFeO3This is because the introduction of Ce and K destroys BiFeO3The symmetrical structure can generate stronger deformation under the same piezoelectric force, generate stronger polarization and stronger built-in electric field, and promote the separation and transfer of carriers.
Example 5
As shown in FIG. 8, the solution after the reaction appeared turbid, but was under the action of magnetic force
Next, the solution quickly recovers clarification, and then the used CKBF-10% is collected, washed with ethanol and deionized water for several times, and then dried for a recycling experiment to consider the stability of the CKBF-10% piezoelectric hydrogen production performance. As shown in FIG. 8 (a), after 4 cycles, the hydrogen production amount by piezoelectric method of CKBF-10% is 515, 499, 490 and 469. mu. mol/g, which well proves the excellent stability and strong magnetism of CKBF-10%, and the schematic diagram of the magnetic separation process is shown in FIG. 8 (b).
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should be considered as the protection scope of the present invention.
Claims (9)
1. A preparation method of a strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst is characterized by comprising the following steps:
step 1: weighing Fe (NO)3)3•9H2O，Bi(NO3)3 •5H2O，KNO3And Ce (NO)3)3•6H2O, mixing with ethylene glycol to obtain a mixed solution;
step 2: adding tartaric acid into the mixed solution obtained in the step 1, continuously stirring the mixed solution in a heating state until the tartaric acid is completely dissolved to form gel, and drying the gel to obtain a CKBF precursor;
And 3, step 3: calcining the obtained CKBF precursor to obtain the CKBF piezoelectric hydrogen production catalyst;
fe (NO) according to step 13)3•9H2O，Bi(NO3)3 •5H2O，KNO3And Ce (NO)3)3•6H2The dosage of O satisfies that the ratio of the sum of the dosage of Ce, K and Bi substances to the dosage of Fe substance is 1: 1; wherein Bi (NO)3)3 •5H2O，KNO3And Ce (NO)3)3•6H2The molar ratio of Bi, K and Ce in the mixture of O is 90-60%, 5-20% and 5-20% respectively.
2. The method of claim 1, wherein: the Bi (NO)3)3 •5H2O，KNO3And Ce (NO)3)3•6H2The molar ratios of Bi, K and Ce in the mixture of O are 85-75%, 5-15% and 5-15% respectively.
3. The method of claim 1, wherein:
fe (NO) as described in step 13)3•9H2The molar volume ratio of O to ethylene glycol is 0.01 mol: 20 to 50mL。
4. The method of claim 1, wherein: the amount of tartaric acid in step 2 is the same as the sum of the amounts of metal cation species in step 1, which is Fe (NO)3)3•9H2O，Bi(NO3)3 •5H2O，KNO3And Ce (NO)3)3•6H2Sum of the amounts of substances of O.
5. The method of claim 1, wherein: in the step 2, the heating temperature is 70-90 ℃, and the stirring time is 1-3 hours.
6. The method of claim 1, wherein: and 3, calcining at 500-600 ℃ for 1-3 h.
7. The production method according to claim 1, characterized in that: and 3, setting the temperature rise program during calcination to be 5-15 ℃/min.
8. A ferromagnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst is prepared by the method of any one of claims 1 to 7, and has a chemical formula of CexKyBi(1-x-y)FeO3，0.05≤x≤0.2，0.05≤y≤0.2。
9. The use of the strong magnetic cerium, potassium-bismuth ferrite solid solution piezoelectric hydrogen production catalyst according to claim 8 in the field of hydrogen production.
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