CN110571286A - Preparation method of up-conversion rare earth fluoride and copper oxide composite electrode - Google Patents
Preparation method of up-conversion rare earth fluoride and copper oxide composite electrode Download PDFInfo
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- CN110571286A CN110571286A CN201910740431.4A CN201910740431A CN110571286A CN 110571286 A CN110571286 A CN 110571286A CN 201910740431 A CN201910740431 A CN 201910740431A CN 110571286 A CN110571286 A CN 110571286A
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- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 20
- -1 rare earth fluoride Chemical class 0.000 title claims abstract description 18
- 239000005751 Copper oxide Substances 0.000 title claims abstract description 13
- 229910000431 copper oxide Inorganic materials 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 51
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000008367 deionised water Substances 0.000 claims description 24
- 229910021641 deionized water Inorganic materials 0.000 claims description 24
- 238000004070 electrodeposition Methods 0.000 claims description 20
- 239000011521 glass Substances 0.000 claims description 20
- 239000011259 mixed solution Substances 0.000 claims description 15
- 229910003366 β-NaYF4 Inorganic materials 0.000 claims description 12
- 238000000151 deposition Methods 0.000 claims description 11
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 6
- 238000003760 magnetic stirring Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 229910052691 Erbium Inorganic materials 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 4
- 230000000536 complexating effect Effects 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000008151 electrolyte solution Substances 0.000 claims description 2
- 235000010378 sodium ascorbate Nutrition 0.000 claims description 2
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 claims description 2
- 229960005055 sodium ascorbate Drugs 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000000053 physical method Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 8
- 238000013329 compounding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 2
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- 229940112669 cuprous oxide Drugs 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a preparation method of an up-conversion rare earth fluoride and copper oxide composite electrode. It is characterized in that the up-conversion rare earth fluoride material NaYF is used4:Yb3+，Er3+The composite electrode is compounded with a CuO electrode, and the photoelectric property of the composite electrode is obviously improved under the irradiation of a 980nm laser light source. NaYF4The crystal has two polymorphic forms, namely a thermodynamically stable hexagonal phase (beta) and a high-temperature metastable cubic phase (alpha), and can be prepared at high temperature and room temperature respectively due to the hexagonal NaYF4:Yb3+，Er3+The upper conversion efficiency is far higher than that of a cubic phase, and the thermodynamically stable hexagonal phase NaYF4 Yb is selected3+，Er3+The electrode is bonded with another ITO substrate deposited with CuO by a physical method, and 980nm laser is deposited by the ITO substrate to obtain NaYF4: Yb3+，Er3+The film is converted into visible light, and partial transmitted light acts on the CuO filmThe utilization of solar spectrum in a wider range is realized.
Description
Technical Field
The invention relates to modification of a photoelectrochemical cathode electrode material, in particular to a method for preparing a composite electrode of upper conversion rare earth fluoride and copper oxide.
Background
In recent years, renewable energy power generation has been a research hotspot of numerous scholars, wherein the conversion of solar energy into Photovoltaic (PV) is a promising solution. The application of related photovoltaic technologies is still limited due to the low power conversion efficiency of solar cells, and the main difficulty in improving the efficiency of photovoltaic energy conversion is the spectral mismatch between the photon energy distribution of the incident solar spectrum and the bandgap of the semiconductor material. The spectral distribution of the total illuminance of sunlight (AM 1.5G) includes photons of a wide wavelength from ultraviolet to infrared (280-2500nm, 0.5-4.4eV), but current PV cells utilize only a relatively small fraction of the solar photons, i.e., a narrow range of solar photons where each PV material responds to energy matching a particular material bandgap. To increase the efficiency of single junction solar cells, three light emission processes including up-conversion, quantum cutting, and down-conversion are being explored to develop efficient photovoltaic devices. Due to the rich energy level structure of the trivalent rare earth ions, simple and convenient photon management can be realized, and the trivalent rare earth ions attract extensive attention of researchers.
The upconversion luminescent material can convert low energy near infrared light into high energy ultraviolet or visible light by absorbing multiple photons or energy transfer. Among various types of phosphors, Rare Earth (RE) materials are very important substances. For Yb3+/Er3+And Yb3+/Tm3+Upconversion system, NaYF4Non-radiative losses can be reduced, resulting in strong up-converted luminescence, one of the most efficient host materials. In addition, NaYF in hexagonal phase4:Yb3+，Er3+exhibits an order of magnitude enhancement in upconversion efficiency over its cubic phase. The narrow band gap allows CuO to absorb the solar spectrum over a large energy range, which is an advantage of CuO as a very promising photocathode for water decomposition.
In the CuO-PV half cell, solar photons with energy lower than the CuO band gap cannot be utilized, and the conversion efficiency of solar energy is greatly hindered. In the invention, the idea of preparing the up-conversion rare earth fluoride and cuprous oxide composite electrode by chemical electrodeposition is used for reference, namely, firstly preparing NaYF by chemical electrodeposition4Film, chemical electrodeposition of Cu2O film, but aiming at CuO, chemical electrodeposition compounding two layers of uniform films is not easy to successfully prepare, the invention adopts a method of firstly preparing a single electrode by electrodeposition respectively and then carrying out physical bonding compounding by conductive adhesive, can overcome the defect that the chemical electrodeposition compounding preparation is not easy to successfully prepare, and utilizes the upper-conversion rare earth fluoride and the conductive adhesiveThe copper oxide composite electrode can improve the conversion rate of solar spectrum, and is expected to develop and utilize sunlight in a larger spectrum range.
Disclosure of Invention
The invention provides a preparation method of a composite electrode of upper conversion rare earth fluoride and copper oxide, which is to mix NaYF4(Yb3+，Er3+) The sample surface of the electrode and the CuO electrode is named as A surface, the other side of the ITO is B surface, and the light source is firstly hexagonal NaYF4(Yb3+，Er3+) The B surface of the electrode is transmitted to the A surface, and the converted visible light on the low-energy light source is transmitted to the A surface through the B surface of the CuO electrode to generate photoelectric response4(Yb3+，Er3+) As another part of the CuO composite electrode, firstly, the defect that photons with energy lower than the CuO band gap energy cannot perform photoelectric conversion in the existing CuO-PV half cell can be overcome, and corresponding solar photons outside the CuO band gap can be converted, so that the range of the solar spectrum which can be converted and utilized is further improved; in addition, compared with the up-conversion rare earth fluoride and copper oxide composite electrode prepared by chemical electrodeposition, the conductive adhesive physically bonds and compounds the two single-chip electrodes, is easy to successfully prepare, and is simple, efficient and novel.
The method for preparing the upper conversion rare earth fluoride and copper oxide composite electrode comprises the following steps:
1) pretreating the ITO conductive slope glass: ultrasonically cleaning the ITO conductive glass by absolute ethyl alcohol for 15-20 minutes, activating the conductive glass in a nitric acid solution, and finally cleaning the conductive glass by deionized water for later use;
2) Preparing NaYF4:Yb3+，Er3+Electrolyte solution: weighing 0.7-0.9mmol Y (NO)3)3，0.20-0.30mmol Yb(NO3)3，0.01-0.015mmolEr(NO3)3Dissolving 1.00mmol of EDTA in 20-30mL of deionized water, dropwise adding NaOH solution to make the pH of the mixed solution be 9-10, and magnetically stirring until the mixed solution is clear to form RE3+-EDTA complex solution;
Weighing 40-45mmol NaF, and adding 40-60mL deionized water for dissolving; NaF solution was added drop-wise to RE3+EDTA complex solution, this process proceedingPerforming magnetic stirring, adding 10-15mmol of sodium ascorbate, and finally performing magnetic stirring for 5-10min until the solution is uniform; adjusting the pH value of the mixed solution to 7.00-7.50, and adding deionized water to fix the volume of the solution for later use;
3) Using ITO conductive glass as a working electrode, a metal platinum sheet electrode as a counter electrode, an Ag/AgCI electrode as a reference electrode, using the mixed solution obtained in the step 2) as an electrolyte, setting the voltage to be 1.0V, setting the electrodeposition time to be 1-2h, and depositing a layer of uniform and compact NaYF on the ITO at the high-temperature water bath temperature through constant-voltage electrodeposition4:Yb3+，Er3+washing the film and the sample with deionized water, drying in the air, placing in a muffle furnace, setting a program for heating, controlling the temperature to 300 ℃ at a speed of 10 ℃/min, keeping the temperature for 6-8 hours, then gradually cooling to room temperature, taking out and marking as beta-NaYF4:Yb3+，Er3+An electrode;
4) 100mL of 2.5-3.5mM Cu (NO) was prepared3)2·3H2o solution, mixing evenly, adding 0.45-0.55M NH under stirring3·H2Fully complexing O, slowly dropwise adding 0.2-0.3M NaOH to make the solution be strongly alkaline, and finally obtaining a stable and transparent dark blue solution; the dark blue solution was used as an electrolyte, and the current density was set to 10mA/cm in a three-electrode system2The system temperature is controlled at 35-50 ℃, and the deposition time is 1000-4000 s; after the electrodeposition is finished, depositing a layer of uniform and compact brown-black CuO film on the conductive glass; washing the sample with deionized water for several times, and then airing for later use;
5) The prepared beta-NaYF4:Yb3+，Er3+The sample surface of the electrode and the CuO electrode film is named as the surface A, and the ITO substrate on the other side is named as the surface B; reacting beta-NaYF4:Yb3+，Er3+Bonding the surface A of the electrode and the surface B of the CuO electrode on the upper side by using black conductive adhesive to obtain the beta-NaYF4:Yb3+，Er3+and CuO are combined with the electrode.
Preferably, in the step 1), the volume fraction of the nitric acid solution is 30%.
Preferably, in the step 1), p of the solution is mixedH adopts 1M NaOH and HNO3Adjusting the solution to make the pH value between 7.00 and 7.50.
preferably, the NaYF of step 3) is4Yb3+, Er3+ film contains 1% Er according to the mass percentage3+And 20% Yb3+。
The method is simple, efficient and novel, and the NaYF with high conversion rate is selected4(Yb3+，Er3+) As the other part of the CuO composite electrode, simple and convenient photon management can be realized, firstly, the defect that photons with energy lower than the CuO band gap energy cannot perform photoelectric conversion in the existing CuO-PV half cell can be overcome, and solar photons with energy higher than the CuO band gap energy can be converted, so that the range of the solar spectrum which can be converted and utilized is further improved; in addition, compared with the up-conversion rare earth fluoride and copper oxide composite electrode prepared by chemical electrodeposition, the conductive adhesive physically bonds and compounds the two single-chip electrodes, is easy to successfully prepare, is simple, efficient and novel, is expected to increase the efficiency of the CuO single-junction solar cell, and improves the utilization rate of solar photons.
NaYF4the crystal has two polymorphic forms, namely a thermodynamically stable hexagonal phase (beta) and a high-temperature metastable cubic phase (alpha), and can be prepared at high temperature and room temperature respectively due to the hexagonal NaYF4:Yb3+，Er3+the upper conversion efficiency is far higher than that of a cubic phase, and the thermodynamically stable hexagonal phase NaYF4 Yb is selected3+，Er3+The electrode is bonded with another ITO substrate deposited with CuO by a physical method, and 980nm laser is deposited by the ITO substrate to obtain NaYF4: Yb3+，Er3+The film is converted into visible light, and partial transmitted light acts on the CuO film, so that the utilization of a wider solar spectrum can be realized.
Drawings
FIG. 1 is a schematic diagram of a photoelectric test of a composite electrode of upper-conversion rare earth fluoride and CuO;
In FIG. 2, is alpha/beta-NaYF4:Yb3+，Er3+Scanning an electron microscope image;
FIG. 3 shows a CuO electrode, alpha-NaYF4:Yb3+，Er3+-CuO composite electrode and beta-NaYF4:Yb3+，Er3+-CuO complexAnd combining electrode photocurrent response curves.
Detailed Description
Example 1
1) Pretreating the ITO conductive slope glass: cleaning with absolute ethyl alcohol in an ultrasonic cleaner for 15 minutes, activating the conductive glass in a nitric acid solution with the volume fraction of 30%, and finally cleaning with deionized water for later use;
2) Preparing NaYF4:Yb3+，Er3+Electrolyte 0.79mmol Y (N0)3)3，0.20mmol Yb(NO3)3，0.01mmolEr(NO3)3And 1.00mmol of EDTA in 30mL of deionized water, dropwise adding NaOH solution to make the pH of the mixed solution be 9-10, and magnetically stirring until the mixed solution is clear to form RE3+EDTA complex solution, 40mmol NaF was weighed into another beaker and dissolved in 40mL deionized water. NaF solution was added drop-wise to RE3+EDTA complex solution, this being carried out under magnetic stirring, and a further weighed quantity of 10mmol C6H7NaO6(ascorbic acid sodium salt), and finally stirring for 5min by magnetic force until the solution is uniform. With 1M NaOH and HNO3Adjusting the pH value of the mixed solution to 7.00 by the solution, and adding deionized water to make the total volume of the solution 100mL for later use;
3) Using ITO conductive glass as a working electrode, a metal platinum sheet electrode as a counter electrode, an Ag/AgCI electrode as a reference electrode, setting the voltage to be 1.0V, setting the electrodeposition time to be 2h, and depositing a layer of uniform and compact NaYF on the ITO by constant-voltage electrodeposition at the water bath temperature of 85 DEG C4:Yb3+，Er3+(1％Er3+And 20% Yb3+) Washing the film with deionized water, and airing in the air for later use;
4) Putting the prepared sample into a muffle furnace, setting a program for heating, controlling the temperature to rise to 300 ℃ at a speed of 10 ℃/min, keeping the temperature for 6 hours, then gradually reducing the temperature to room temperature, taking out and marking the sample as a hexagonal phase (beta-NaYF)4:Yb3+，Er3+) Standby, as shown in fig. 1 for the left electrode;
5) 100mL of 3mM Cu (NO) was prepared3)2·3H2Mixing O solution, adding while stirring0.5M NH3·H2And fully complexing O, slowly dropwise adding 0.25M NaOH to make the solution be strongly alkaline, and finally obtaining a stable and transparent dark blue solution. The current density was set to 10mA/cm in a three-electrode system2The system temperature is controlled at 40 ℃, and the deposition time is 2000 s. After the electrodeposition is finished, a layer of uniform and compact brown-black CuO film is deposited on the conductive glass. Washing the sample with deionized water for several times, and air drying for later use, as shown in the right electrode of FIG. 1;
6) Reacting beta-NaYF4:Yb3+，Er3+the electrodes were bonded to CuO electrodes as shown in fig. 1, and the photoelectric response was recorded in a three-electrode system using a 980nm laser lamp as the light source, using an electrochemical workstation CHI 660E.
Example 2
1) Pretreating the ITO conductive slope glass: cleaning with anhydrous ethanol in an ultrasonic cleaner for 15 minutes, activating the conductive glass in a 30% nitric acid solution, and finally cleaning with deionized water for later use;
2) Preparing NaYF4:Yb3+，Er3+Electrolyte 0.79mmol Y (N0)3)3，0.20mmol Yb(NO3)3，0.01mmolEr(NO3)3And 1.00mmol of EDTA in 30mL of deionized water, dropwise adding NaOH solution to make the pH of the mixed solution be 9-10, and magnetically stirring until the mixed solution is clear to form RE3+EDTA complex solution, 40mmol NaF was weighed into another beaker and dissolved in 40mL deionized water. NaF solution was added drop-wise to RE3+EDTA complex solution, this being carried out under magnetic stirring, and a further weighed quantity of 10mmol C6H7NaO6(ascorbic acid sodium salt), and finally stirring for 5min by magnetic force until the solution is uniform. With 1M NaOH and HNO3Adjusting the pH value of the mixed solution to 7.00 by the solution, and adding deionized water to make the total volume of the solution 100mL for later use;
3) Using ITO conductive glass as a working electrode, a metal platinum sheet electrode as a counter electrode, an Ag/AgCI electrode as a reference electrode, setting the voltage to be 1.0V, setting the electrodeposition time to be 2h, and depositing a layer of uniform and compact NaYF on the ITO by constant-voltage electrodeposition at the water bath temperature of 30 DEG C4:Yb3+，Er3+(1％Er3+And 20% Yb3+) The film, rinsed with deionized water, air dried, and labeled cubic phase (. alpha. -NaYF)4:Yb3+，Er3+) Standby;
4) 100mL of 3mM Cu (NO) was prepared3)2·3H2O solution, mixing well, adding 0.5M NH under stirring3·H2And fully complexing O, slowly dropwise adding 0.25M NaOH to make the solution be strongly alkaline, and finally obtaining a stable and transparent dark blue solution. The current density was set to 10mA/cm in a three-electrode system2The system temperature is controlled at 40 ℃, and the deposition time is 2000 s. And after the electrodeposition is finished, depositing a layer of brownish black CuO film on the conductive glass. Washing the sample with deionized water for several times, and then airing for later use;
5) mixing alpha-NaYF4:Yb3+，Er3+The electrodes were bonded to CuO electrodes as shown in fig. 1, and the photoelectric response was recorded in a three-electrode system using a 980nm laser lamp as the light source, using an electrochemical workstation CHI 660E.
FIG. 2 shows NaYF in different crystal forms4:Yb3+，Er3+In a plane electron microscope picture, the upper part is a cubic phase, the lower part is six directions, and observation can find the vertical direction NaYF4:Yb3+，Er3+Is spherical and hexagonal NaYF4:Yb3+，Er3+Is in a prismatic flower-shaped structure. Six-direction ratio cubic phase NaYF4:Yb3+，Er3+the up-conversion luminescence efficiency is higher by several orders of magnitude, so we choose to prepare six-direction NaYF4:Yb3+，Er3+With CuO composite electrode, the hexagonal NaYF is formed4:Yb3+，Er3+The a-side of the electrode and the B-side of the CuO electrode were bonded with a conductive adhesive as shown in fig. 1.
the prepared composite electrode was subjected to a photoelectric test with 980nm laser as a light source, and the test results are shown in fig. 3. The photoelectric response value of the CuO single electrode is 0.9 muA, and the cubic alpha-NaYF4:Yb3+，Er3+The photoelectric response value of the CuO composite electrode is 1.6 muA, and the hexagonal beta-NaYF4:Yb3+，Er3+The photoelectric response value of the composite electrode with CuO is obviously higher than that of a CuO single electrode and is 3.1 muA, so that the novel composite electrode is effective for improving the photoelectric response.
Claims (4)
1. a preparation method of an up-conversion rare earth fluoride and copper oxide composite electrode is characterized by comprising the following steps:
1) Pretreating the ITO conductive slope glass: ultrasonically cleaning the ITO conductive glass by absolute ethyl alcohol for 15-20 minutes, activating the conductive glass in a nitric acid solution, and finally cleaning the conductive glass by deionized water for later use;
2) Preparing NaYF4:Yb3+，Er3+electrolyte solution: weighing 0.7-0.9mmol Y (NO)3)3，0.20-0.30mmol Yb(NO3)3，0.01-0.015mmolEr(NO3)3Dissolving 1.00mmol of EDTA in 20-30mL of deionized water, dropwise adding NaOH solution to make the pH of the mixed solution be 9-10, and magnetically stirring until the mixed solution is clear to form RE3+-EDTA complex solution;
weighing 40-45mmol NaF, and adding 40-60mL deionized water for dissolving; NaF solution was added drop-wise to RE3+EDTA complex solution, the process is magnetic stirring, then the weighed 10-15mmol sodium ascorbate is added, and finally the solution is magnetic stirring for 5-10min until the solution is uniform; adjusting the pH value of the mixed solution to 7.00-7.50, and adding deionized water to fix the volume of the solution for later use;
3) Using ITO conductive glass as a working electrode, a metal platinum sheet electrode as a counter electrode, an Ag/AgCI electrode as a reference electrode, using the mixed solution obtained in the step 2) as an electrolyte, setting the voltage to be 1.0V, setting the electrodeposition time to be 1-2h, and depositing a layer of uniform and compact NaYF on the ITO at the high-temperature water bath temperature through constant-voltage electrodeposition4:Yb3+，Er3+Washing the film and the sample with deionized water, drying in the air, placing in a muffle furnace, setting a program for heating, controlling the temperature to 300 ℃ at a speed of 10 ℃/min, keeping the temperature for 6-8 hours, then gradually cooling to room temperature, taking out and marking as beta-NaYF4:Yb3+，Er3+An electrode;
4) 100mL of 2.5-3.5mM Cu (NO) was prepared3)2·3H2O solution, mixing evenly, adding 0.45-0.55M NH under stirring3·H2fully complexing O, slowly dropwise adding 0.2-0.3M NaOH to make the solution be strongly alkaline, and finally obtaining a stable and transparent dark blue solution; the dark blue solution was used as an electrolyte, and the current density was set to 10mA/cm in a three-electrode system2the system temperature is controlled at 35-50 ℃, and the deposition time is 1000-4000 s; after the electrodeposition is finished, depositing a layer of uniform and compact brown-black CuO film on the conductive glass; washing the sample with deionized water for several times, and then airing for later use;
5) The prepared beta-NaYF4:Yb3+，Er3+The sample surface of the electrode and the CuO electrode film is named as the surface A, and the ITO substrate on the other side is named as the surface B; reacting beta-NaYF4:Yb3+，Er3+Bonding the surface A of the electrode and the surface B of the CuO electrode on the upper side by using black conductive adhesive to obtain the beta-NaYF4:Yb3+，Er3+And CuO are combined with the electrode.
2. The method for preparing the up-conversion rare earth fluoride and copper oxide composite electrode according to claim 1, wherein the volume fraction of the nitric acid solution in the step 1) is 30%.
3. The method for preparing the up-conversion rare earth fluoride and copper oxide composite electrode according to claim 1, wherein in the step 1), the pH of the mixed solution is 1M NaOH and HNO3Adjusting the solution to make the pH value between 7.00 and 7.50.
4. The method for preparing the composite electrode of up-conversion rare earth fluoride and copper oxide according to claim 1, wherein the NaYF obtained in the step 3)4yb3+, Er3+ film contains 1% Er according to the mass percentage3+And 20% Yb3+。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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