CN114408979A - Perovskite oxide nano-particles with high-index crystal face and preparation method thereof - Google Patents
Perovskite oxide nano-particles with high-index crystal face and preparation method thereof Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims abstract description 61
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 54
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 48
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 45
- 239000012498 ultrapure water Substances 0.000 claims abstract description 45
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000003756 stirring Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 26
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004202 carbamide Substances 0.000 claims abstract description 22
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229940099596 manganese sulfate Drugs 0.000 claims abstract description 18
- 239000011702 manganese sulphate Substances 0.000 claims abstract description 18
- 235000007079 manganese sulphate Nutrition 0.000 claims abstract description 18
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 16
- 239000006228 supernatant Substances 0.000 claims abstract description 16
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 43
- 238000011049 filling Methods 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 239000011572 manganese Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 37
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 230000014759 maintenance of location Effects 0.000 description 6
- -1 oxygen ions Chemical class 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
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- 238000013112 stability test Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
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- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
- H01M4/9025—Oxides specially used in fuel cell operating at high temperature, e.g. SOFC
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Abstract
The invention discloses perovskite oxide nano particles with high-index crystal faces, and a preparation method of the perovskite oxide nano particles comprises the following steps: 1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A; 2) adding lanthanum nitrate and potassium permanganate and stirring to obtain a solution B; 3) adding urea, dissolving, adding potassium hydroxide, stirring, adding ultrapure water, and transferring to a hydrothermal reaction kettle; 4) reacting under heating condition; 5) and cooling to room temperature after the reaction is finished, taking supernatant, cleaning lower-layer solid, and drying to obtain the perovskite oxide nano-particles with high-index crystal faces. The manganese-based perovskite oxide with the exposed high-index crystal face {111} is successfully prepared, a universal method is provided for synthesizing the high-index crystal face perovskite oxide, the manganese-based perovskite oxide is used as a lithium-air battery anode catalyst, the catalytic activity and the stability of the battery are remarkably improved, and the method has important significance for the development of the lithium-air battery anode catalyst.
Description
Technical Field
The invention relates to the field of nano materials, in particular to perovskite oxide nano particles with high-index crystal faces and a preparation method thereof.
Background
The perovskite structure oxide has a unique and stable crystal structure, has wide application in the aspects of fuel cells, solid electrolytes, sensors, high-efficiency catalysts, dielectric and ferroelectric signal storage, high-temperature superconductivity, giant magnetoresistance devices and the like, and particularly becomes a star structure in the field of energy catalysis in the last two years. The synthesis of the perovskite oxide mainly comprises methods such as high-temperature solid phase, sol-gel, coprecipitation and the like, wherein the methods all relate to the high-temperature treatment process, the product is easy to form a thermodynamic stable state (surface energy is reduced, active dangling bonds are reduced and the like), and the obtained product is a polycrystalline sample with disordered crystal faces; even if a single crystal perovskite oxide sample obtained under a hydrothermal condition is obtained, the surface of the single crystal perovskite oxide sample is mainly composed of a crystal face with the lowest surface energy, the bonding mode of surface atoms is a key factor for determining the physical and chemical properties of the material, and the surface steps and defects of a high-index crystal face enable the single crystal perovskite oxide sample to have more surface low-coordination atoms relative to a low-index crystal face, so that the single crystal perovskite oxide sample can be used as an active site for adsorption and reaction, and the catalytic activity is improved. The perovskite oxide prepared by the conventional method is mainly composed of crystal planes with the lowest surface energy, and therefore, the catalytic performance of the perovskite oxide is limited by the conventional preparation method.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a perovskite oxide nanoparticle having a high-index crystal face and a method for preparing the same, aiming at the defects in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: the perovskite oxide nano-particles with high-index crystal faces are prepared by taking manganese sulfate, calcium nitrate, lanthanum nitrate, potassium permanganate, urea and potassium hydroxide as raw materials and synthesizing through a hydrothermal reaction.
Preferably, the preparation method of the perovskite oxide nano-particles with the high-index crystal face comprises the following steps:
1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A;
2) adding lanthanum nitrate and potassium permanganate into the solution A, and stirring to obtain a solution B;
3) adding urea into the solution B, adding potassium hydroxide after dissolving, stirring, adding ultrapure water to obtain a mixture, and transferring the mixture into a hydrothermal reaction kettle;
4) reacting the hydrothermal reaction kettle under the heating condition;
5) and cooling to room temperature after the reaction is finished, taking supernatant, cleaning lower-layer solid, and drying to obtain the perovskite oxide nano-particles with high-index crystal faces.
Preferably, the preparation method of the perovskite oxide nano-particles with the high-index crystal face comprises the following steps:
1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A;
2) adding lanthanum nitrate and potassium permanganate into the solution A, and stirring to obtain a solution B;
3) adding urea into the solution B, adding potassium hydroxide after dissolving, stirring for 10-60 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 50-80%;
4) the hydrothermal reaction kettle is placed at the temperature of 230 ℃ and 260 ℃ for reaction for 36 to 72 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 50-90 ℃ to obtain the perovskite oxide nano-particles with high-index crystal faces.
Preferably, the preparation method of the perovskite oxide nano-particles with the high-index crystal face comprises the following steps:
1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A;
2) adding lanthanum nitrate and potassium permanganate into the solution A, and stirring to obtain a solution B;
3) adding urea into the solution B, adding potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 70 ℃ to obtain the perovskite oxide nano-particles with high-index crystal faces.
Preferably, the preparation method of the perovskite oxide nano-particles with the high-index crystal face comprises the following steps:
1) dissolving 0.5-2mmol of manganese sulfate and 0.5-2mmol of calcium nitrate in 5-20mL of ultrapure water to obtain milky solution A;
2) adding 0.5-2mmol of lanthanum nitrate and 0.2-2mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 1-4g of urea into the solution B, adding 5-20g of potassium hydroxide after dissolving, stirring for 10-60 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 50-80%;
4) the hydrothermal reaction kettle is placed at the temperature of 230 ℃ and 260 ℃ for reaction for 36 to 72 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 50-90 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces.
Preferably, the preparation method of the perovskite oxide nano-particles with the high-index crystal face comprises the following steps:
1) dissolving 0.5-2mmol of manganese sulfate and 0.5-2mmol of calcium nitrate in 5-20mL of ultrapure water to obtain milky solution A;
2) adding 0.5-2mmol of lanthanum nitrate and 0.2-2mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 1-4g of urea into the solution B, adding 5-20g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces.
Preferably, the preparation method of the perovskite oxide nano-particles with the high-index crystal face comprises the following steps:
1) dissolving 1.4mmol of manganese sulfate and 1mmol of calcium nitrate in 10mL of ultrapure water to obtain milky solution A;
2) adding 1mmol of lanthanum nitrate and 0.7mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 2.25g of urea into the solution B, adding 9-10g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a 25mL hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid for 3 times by using ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces.
The invention has the beneficial effects that: the manganese-based perovskite oxide with the exposed high-index crystal face {111} is successfully prepared, a universal method is provided for synthesizing the high-index crystal face perovskite oxide, the manganese-based perovskite oxide is used as a lithium-air battery anode catalyst, the catalytic activity and the stability of the battery are remarkably improved, and the method has important significance for the development of the lithium-air battery anode catalyst.
Drawings
FIG. 1 is an X-ray diffraction pattern of LCMO-1 and LCMO-2 powder according to the present invention;
FIG. 2 is a scanning electron microscope image of LCMO-1(a) and LCMO-2(b) in the present invention;
FIG. 3 is a graph showing discharge-charge curves of a lithium air battery using LCMO-1 and LCMO-2 as positive electrode catalysts in the range of voltage of 2.5-4.4V at a current density of 100mA/g in accordance with the present invention;
FIG. 4 is a graph showing discharge-charge curves of a lithium air battery using LCMO-1 and LCMO-2 as positive electrode catalysts in the range of voltage of 2.5-4.4V at a current density of 200mA/g in accordance with the present invention;
FIG. 5 is a graph showing discharge-charge curves of a lithium air battery using LCMO-1 and LCMO-2 as positive electrode catalysts in the range of voltage of 2.5-4.4V at a current density of 500mA/g in accordance with the present invention;
FIG. 6 shows the capacity retention of a lithium air battery using LCMO-1 and LCMO-2 as positive electrode catalysts in accordance with the present invention;
FIG. 7 shows the results of the cycle stability test of the lithium-air battery of the present invention using LCMO-1 and LCMO-2 as the positive electrode catalyst.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
A perovskite oxide nano particle with a high-index crystal face is prepared by the following steps:
1) dissolving 1.4mmol of manganese sulfate and 1mmol of calcium nitrate in 10mL of ultrapure water to obtain milky solution A;
2) adding 1mmol of lanthanum nitrate and 0.7mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 2.25g of urea into the solution B, adding 9-10g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a 25mL hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid for 3 times by using ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces, which is marked as LCMO-1.
Example 2
A perovskite oxide nano particle with a high-index crystal face is prepared by the following steps:
1) dissolving 1.4mmol of manganese sulfate and 1mmol of calcium nitrate in 10mL of ultrapure water to obtain milky solution A;
2) adding 1mmol of lanthanum nitrate and 0.7mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 2g of urea into the solution B, adding 12g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture to a 25mL hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 80%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 36 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid for 3 times by using ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces, which is marked as LCMO-1-2.
Example 3
A perovskite oxide nano particle with a high-index crystal face is prepared by the following steps:
1) dissolving 1.4mmol of manganese sulfate and 1mmol of calcium nitrate in 10mL of ultrapure water to obtain milky solution A;
2) adding 1mmol of lanthanum nitrate and 0.7mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 2.75g of urea into the solution B, adding 10g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a 25mL hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 60%;
4) placing the hydrothermal reaction kettle at 260 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid for 3 times by using ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces, which is marked as LCMO-1-3.
Comparative example 1
This example differs from example 1 only in that no urea was added in step 3) and the tan solid synthesized in this example was designated as LCMO-2.
The LCMO-1 obtained in example 1 and LCMO-2 obtained in example 2 were subjected to the related performance tests and comparisons to further illustrate the present invention.
1. Structural characterization of perovskite oxides:
referring to FIG. 1, X-ray diffraction patterns of LCMO-1 and LCMO-2 powders show that LCMO-1 and LCMO-2 are pure phases of perovskite oxides and no impurities are present.
2. Morphology characterization of perovskite oxides:
referring to FIG. 2, scanning electron micrographs of LCMO-1(a) and LCMO-2(b) show that common perovskite oxide LCMO-2 has a regular cubic morphology, and {100} crystal faces are always exposed; LCMO-1 has an octahedral shape, so that a {111} crystal face is exposed; LCMO-1 and LCMO-2 are substantially the same size, both being about 10 μm.
3. Promotion effect of high-index crystal face on lithium-air battery:
and (3) assembling the LCMO-1 and the LCMO-2 as positive electrode catalysts to form the lithium air battery, and characterizing the performance of the lithium air battery.
Referring to FIG. 3, a graph showing discharge-charge curves of a lithium air battery using LCMO-1 and LCMO-2 as a positive electrode catalyst in a voltage range of 2.5-4.4V at a current density of 100 mA/g; the discharge specific capacity of the traditional perovskite oxide LCMO-2 is 4336.3mAh/g, while the discharge specific capacity corresponding to the LCMO-1 with a {111} high-index crystal face reaches 7432.8mAh/g, and the specific capacity is remarkably improved.
Referring to FIG. 4, a graph showing discharge-charge curves of a lithium air battery using LCMO-1 and LCMO-2 as a positive electrode catalyst in a voltage range of 2.5-4.4V at a current density of 200 mA/g; referring to FIG. 5, the discharge-charge curves of lithium air batteries using LCMO-1 and LCMO-2 as positive electrode catalysts at a current density of 500mA/g and a voltage range of 2.5-4.4V are shown. FIGS. 4 and 5 are discharge-charge graphs of the battery after increasing the current density during the test to 200mA/g and 500mA/g, and it can be seen from FIGS. 4 and 5 that the specific discharge capacity of LCMO-2 is 3516.9 and 2352.2mAh/g, respectively, while the specific discharge capacity of LCMO-1 is 6315.2 and 5387.8mAh/g, which is twice that of LMCO-1.
Further, the capacity retention rates of LCMO-1 and LCMO-2 were calculated, as shown in FIG. 6, when the current density was increased to 200mA/g, the capacity retention rate of LCMO-1 was 85%, and the capacity retention rate of LCMO-2 was 81%; when the current density is further increased to 500mA/g, the capacity retention rate of LCMO-1 is still at a higher level, 72%, while that of LCMO-2 is decreased to 54%. Therefore, the capacity retention of LCMO-1 is better than that of LCMO-2.
Referring to FIG. 7, the cycle stability test results of the lithium air battery using LCMO-1 and LCMO-2 as the anode catalysts are shown, and the test conditions are as follows: the capacity cutoff test was carried out at a current density of 200mA/g, with a capacity limit of 500 mAh/g. As can be seen, LCMO-2 can only stably circulate for 24 circles, while LCMO-1 can stably circulate for 79 circles, which is more than 3 times that of LCMO-2.
The results show that the high-index crystal face plays an important role in improving the performance of the lithium-air battery. The invention improves the traditional hydrothermal reaction, particularly obtains the perovskite oxide exposing the high-index crystal face {111} by adding urea, provides a universal method for synthesizing the perovskite oxide with the high-index crystal face, and has important significance for the development of the lithium-air battery anode catalyst.
In the process of growing the perovskite oxide, BO6 (the structural general formula of the perovskite oxide is ABO3, BO6 refers to a microstructure consisting of 1B site ion and 6 oxygen ions) octahedron is negatively charged, can attract positive ions in a solution, and is lanthanum ions (La ions) in general hydrothermal synthesis3+) Thereby forming a conventional perovskite oxide exposed with 100 planes. After the urea is introduced, the urea is heated in the aqueous solution to generate ammonium ions (NH)4+) Due to NH4+Size of and La3+Close to the La and has a regular tetrahedron configuration, thereby being capable of replacing the La3+Adsorbing on BO6 octahedron and masking to form perovskite oxide with exposed 111 crystal plane. Because the reactive active sites of the perovskite oxide are often metal ions at the B site, the formation of the {111} crystal face is beneficial to increasing the number of the active sites of the perovskite oxide and promoting the subsequent reaction of the lithium-air battery.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (7)
1. The perovskite oxide nano-particles with high-index crystal faces are characterized by being prepared by taking manganese sulfate, calcium nitrate, lanthanum nitrate, potassium permanganate, urea and potassium hydroxide as raw materials and synthesizing through a hydrothermal reaction.
2. The perovskite oxide nanoparticle having a high-index crystal plane according to claim 1, wherein the preparation method comprises the steps of:
1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A;
2) adding lanthanum nitrate and potassium permanganate into the solution A, and stirring to obtain a solution B;
3) adding urea into the solution B, adding potassium hydroxide after dissolving, stirring, adding ultrapure water to obtain a mixture, and transferring the mixture into a hydrothermal reaction kettle;
4) reacting the hydrothermal reaction kettle under the heating condition;
5) and cooling to room temperature after the reaction is finished, taking supernatant, cleaning lower-layer solid, and drying to obtain the perovskite oxide nano-particles with high-index crystal faces.
3. The perovskite oxide nanoparticle having a high-index crystal plane according to claim 2, wherein the preparation method comprises the steps of:
1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A;
2) adding lanthanum nitrate and potassium permanganate into the solution A, and stirring to obtain a solution B;
3) adding urea into the solution B, adding potassium hydroxide after dissolving, stirring for 10-60 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 50-80%;
4) the hydrothermal reaction kettle is placed at the temperature of 230 ℃ and 260 ℃ for reaction for 36 to 72 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 50-90 ℃ to obtain the perovskite oxide nano-particles with high-index crystal faces.
4. The perovskite oxide nanoparticle having a high-index crystal plane according to claim 3, wherein the preparation method comprises the steps of:
1) dissolving manganese sulfate and calcium nitrate in ultrapure water to obtain a solution A;
2) adding lanthanum nitrate and potassium permanganate into the solution A, and stirring to obtain a solution B;
3) adding urea into the solution B, adding potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 70 ℃ to obtain the perovskite oxide nano-particles with high-index crystal faces.
5. The perovskite oxide nanoparticle having a high-index crystal plane according to claim 4, wherein the preparation method comprises the steps of:
1) dissolving 0.5-2mmol of manganese sulfate and 0.5-2mmol of calcium nitrate in 5-20mL of ultrapure water to obtain milky solution A;
2) adding 0.5-2mmol of lanthanum nitrate and 0.2-2mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 1-4g of urea into the solution B, adding 5-20g of potassium hydroxide after dissolving, stirring for 10-60 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 50-80%;
4) the hydrothermal reaction kettle is placed at the temperature of 230 ℃ and 260 ℃ for reaction for 36 to 72 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 50-90 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces.
6. The perovskite oxide nanoparticle having a high-index crystal plane according to claim 5, wherein the preparation method comprises the steps of:
1) dissolving 0.5-2mmol of manganese sulfate and 0.5-2mmol of calcium nitrate in 5-20mL of ultrapure water to obtain milky solution A;
2) adding 0.5-2mmol of lanthanum nitrate and 0.2-2mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 1-4g of urea into the solution B, adding 5-20g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid with ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces.
7. The perovskite oxide nanoparticle having a high-index crystal plane according to claim 6, wherein the preparation method comprises the steps of:
1) dissolving 1.4mmol of manganese sulfate and 1mmol of calcium nitrate in 10mL of ultrapure water to obtain milky solution A;
2) adding 1mmol of lanthanum nitrate and 0.7mmol of potassium permanganate into the solution A, and stirring to obtain a dark brown solution B;
3) adding 2.25g of urea into the solution B, adding 9-10g of potassium hydroxide after dissolving, stirring for 30 minutes, adding ultrapure water to obtain a mixture, transferring the mixture into a 25mL hydrothermal reaction kettle, and controlling the filling degree of the mixture in the hydrothermal reaction kettle to be 70%;
4) placing the hydrothermal reaction kettle at 240 ℃ for reaction for 48 hours;
5) and after the reaction is finished, cooling to room temperature, taking supernatant, washing the lower-layer solid for 3 times by using ultrapure water, and drying at 70 ℃ to obtain a tan solid, namely the perovskite oxide nano-particles with the high-index crystal faces.
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| CN102877131A (en) * | 2012-10-19 | 2013-01-16 | 浙江大学 | Preparation method of octahedral structural perovskite lead titanate single crystal nano particles |
| CN105562122A (en) * | 2015-12-15 | 2016-05-11 | 中国科学院上海高等研究院 | Perovskite type core-shell structured metal oxide and preparation method and application thereof |
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| CN102877131A (en) * | 2012-10-19 | 2013-01-16 | 浙江大学 | Preparation method of octahedral structural perovskite lead titanate single crystal nano particles |
| CN105562122A (en) * | 2015-12-15 | 2016-05-11 | 中国科学院上海高等研究院 | Perovskite type core-shell structured metal oxide and preparation method and application thereof |
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