CN104762634B - Photoelectrode for producing hydrogen and oxygen by photoelectrochemistry decomposition water and preparation and application thereof - Google Patents

Photoelectrode for producing hydrogen and oxygen by photoelectrochemistry decomposition water and preparation and application thereof Download PDF

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CN104762634B
CN104762634B CN201510119013.5A CN201510119013A CN104762634B CN 104762634 B CN104762634 B CN 104762634B CN 201510119013 A CN201510119013 A CN 201510119013A CN 104762634 B CN104762634 B CN 104762634B
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quantum dot
production
photocathode
production hydrogen
oxygen
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CN104762634A (en
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吴骊珠
刘宾
李旭兵
李剑
高雨季
李治军
佟振合
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Technical Institute of Physics and Chemistry of CAS
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00Electrolytic production of inorganic compounds or non-metals
    • C25B1/50Processes
    • C25B1/55Photoelectrolysis
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00Electrolytic production of inorganic compounds or non-metals
    • C25B1/01Products
    • C25B1/02Hydrogen or oxygen
    • C25B1/04Hydrogen or oxygen by electrolysis of water
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/02Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/36Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/133Renewable energy sources, e.g. sunlight

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  • Chemical Kinetics & Catalysis (AREA)
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  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

The photoelectrode is characterized by comprising a photocathode and a photoanode, wherein the photocathode and the photoanode are provided with quantum dots assembled by assistance of bifunctional molecules. The invention realizes the establishment and application of photoelectrochemistry water decomposition hydrogen production and oxygen production photoelectrode based on semiconductor, quantum dot and catalyst; the method has the characteristics of high stability, no need of a sacrificial agent, simple operation, good repeatability, strong universality and high utilization efficiency of visible light, and the catalyst does not need noble metal and is cheap and easy to obtain.

Description

Optical electro-chemistry decomposes aquatic products hydrogen, the optoelectronic pole for producing oxygen and its preparation and application
Technical field
The present invention relates to photoelectrocatalysis decomposition water field.More particularly, to one kind based on p-type and n-type semiconductor substrate, The optical electro-chemistry of quantum dot and catalyst decomposes aquatic products hydrogen, production oxygen optoelectronic pole, and its prepares and apply.
Background technology
With the rapid development of economy, the mankind increasingly increase for the demand of the energy.Fossil energy disappears as the world today The main energy of consumption, the contribution of brilliance was once made on the road of human industryization development.However, continue with the mankind Exploitation, the exhaustion of fossil energy are inevitable.Related data shows that most fossil energy will be produced nearly within the centuries To the greatest extent;On the other hand, the adjoint environmental problem of the consumption of fossil energy also receives the mankind and more and more paid attention to.Therefore, open Send out and using green, sustainable novel energy (such as solar energy, biomass energy, nuclear energy, wind energy), improve it in the whole energy Ratio in structure is extremely urgent.In numerous novel energies, solar energy not only can be used freely but also need not with its aboundresources Transport, and do not produce the advantages such as any environmental pollution and attracted increasing concern.Although the total resources of solar energy is suitable Utilize more than 10,000 times of the energy in current mankind, but its exist energy density it is very low, because when become, vary in different localities the shortcomings that, Therefore the utilization to solar energy cause very big challenge.In view of above-mentioned limiting factor, people are more likely to find one kind Effective approach converts solar energy into chemical energy, electric energy etc., and is concentrated storage to utilize.Turn in numerous solar energy In change approach, the photocatalytic water approach directly converted solar energy into using hydrogen and oxygen as the chemical energy of carrier is of greatest concern One of mode.In the reaction of photocatalytic water, oxidizing process can produce oxygen, and it is the root of current species diversity;Reduction Process can produce hydrogen, and it is considered as the clean energy resource of the great potential of high-energy-density.For China, solar energy and Water resource is all relatively abundanter, therefore solar energy photocatalytic water method has very vast potential for future development.
Semiconductor nano (quantum dot) has the advantages that absorptivity is big, band gap is adjustable, matched with solar spectrum, in recent years Come the research of the Photocatalyzed Hydrogen Production system using it as light absorbent and achieve huge progress.However, it is currently based on quantum It is required to add substantial amounts of electronics sacrificial body in the Photocatalyzed Hydrogen Production system of point, should which greatly limits its further reality With.Photoelectrocatalysis decomposition water provides a kind of method avoided using sacrificial reagent.Compared to the photocatalysis Decomposition in solution Aqueous systems, photoelectricity system can realize the full decomposition of water, and the generation of hydrogen and oxygen is to betide negative electrode and anode respectively, and nothing Accessory substance produces, and is had a good application prospect for industrialized production.But current photoelectrocatalytioxidation oxidation system still suffers from a lot Problem, for example its energy conversion efficiency is still very low, system cost is higher, therefore it is difficult to use in actual production.Therefore photoelectricity is urged Change decompose aqueous systems carry out deeper into research there is very major and immediate significance.
In photoelectricity system, light anode typically uses n-type semiconductor, wherein it is most widely TiO to study2.Since Honda and Fujishima utilizes TiO within 19722Electrode, since realizing the decomposition of water under the irradiation of ultraviolet light, various countries Researcher utilizes TiO2The research of a large amount of optical electro-chemistry hydrogen production by water decomposition is done.But TiO2It is a kind of wide bandgap material (3.2eV), it is only capable of absorbing contained seldom ultraviolet light in sunshine.This property causes single TiO2Electrode light conversion effect Rate is very low, it is necessary to expand TiO by suitable method2Light absorption range, such as adulterate, be sensitized.Quantum dot is a kind of excellent Sensitized material, professor Kamat have been a large amount of quantum dot sensitized TiO2Research, quantum dot is connected to by bifunctional molecule TiO2On, light induced electron is determined on quantum dot to TiO2Charge velocity, by adjusting quantum dot TiO2The electric charge transfer of interface And the ligand modified function of quantum point, improve device performance (J.Phys.Chem.C 2013,117,14418-14426; J.Am.Chem.Soc.2006,128,2385-2393;J.Phys.Chem.Lett.2012,3,663-672; Proc.Nat.Acad.Sci.U.S.A.2011,108,29-34).But concern is primarily with quantum dot for the work of Kamat professors It is sensitized TiO2The solar cell of type, the research of decomposition water is not carried out.2013, professor Bisquert etc. CdSe quantum dot is deposited to TiO by (Adv.Energy Mater.2013,3,176-182) by the way of chemical thought2 On, the light anode of production hydrogen is constructed, theoretical hydrogen-producing speed reaches 20ml/ (cm2day1).At present, the light anode body based on quantum dot System is so to construct mode (ACS Appl.Mat.Interfaces2013,5,1113-1121 mostly; Chem.Mater.2010,22,922-927;J.Phys.Chem.C 2011,115,25429-25436; J.Mater.Chem.2011,21,8749-8755 etc.), but this kind of system is that sacrifice examination is there are in electrolyte solution Hydrogen is produced under conditions of agent, therefore the half-reaction of the substantially decomposition water carried out.In the case of no sacrifice reagent, quantum Point is as light anode oxidation water, and there is perishable, the problem of stability difference, the progress of this respect is slower.2010 Year, CdTe quantum is adsorbed onto by Liu etc. (Angew.Chem.Int.Ed.2010,49,5966-5969) by TGA On ZnO nano-wire, the light anode of decomposition water is prepared for, but hydrogen and oxygen are not detected really in their system. Therefore, develop efficiently, stably, inexpensively, and the real light sun for decomposing aquatic products oxygen is realized in the system that reagent is sacrificed without adding Pole is still a difficult task.
On the other hand, photocathode typically uses p-type semiconductor material, because the species of p-type semiconductor material is very limited, because This is a significant and challenging job for the research of photocathode.At present, the work of photocathode is mainly p-type silicon And Cu2O systems.Not rarely seen (the Energy Environ.Sci.2011,4,1690-1694 of p-type silicon photocathode;Nano Lett.2012,12,298-302;Nat.Mater.2011,10,434-438;ACS Appl.Mat.Interfaces 2014, 6,12111-12118 etc.), wherein most representative be, and Ib Chorkendorff etc. (Nat.Mater.2011,10,434- 438) Mo is modified on p-type silicon3S4The solar energy that the photocathode that cluster is constructed is realized more than 10% goes to the transformation efficiency of Hydrogen Energy, But the manufacturing cost of p-type silicon is very high, the prospect of its large-scale application have impact on.Cu2The problem of O photocathodes be stability too Difference, maximum is made progress in the research of enhancing stability is SwitzerlandTeach seminar.They (Nat.Mater.2011,10,456-461;Angew.Chem.Int.Ed.2014,54,664-667 a kind of Cu) is proposed2O is protected Shield strategy, i.e., in Cu by way of ald2The ZnO and TiO of the Al doping of nanometer grade thickness are deposited on O2, successfully carry High Cu2O stability.Although protective layer inhibits Cu2O photoetch, but it, which is prepared, needs higher instrument condition, Operation is also more complicated.Quantum dot is applied to the work that photocathode starts from the professors of Pickett in 2010 et al. (Angew.Chem.Int.Ed.2010,49,1574-1577), they are by the use of double thiol molecules as connection molecule by InP quantum Point modification is to having constructed quantum dot light cathode systems on gold electrode, but the cathode photo current of the system (na) and photoelectrocatalysis Hydrogen output (nanomole) is very low, while sensitising agent InP synthesis condition is harsh, toxicity is larger, and these deficiencies all limit it and entered One step is applied and development.Henceforth, quantum dot light negative electrode is rarely reported.Until 2013, professor Domen etc. (J.Am.Chem.Soc.2013,135,3733-3735) use chemical bath deposition by CdS nanoparticle depositions in p-type CuGaSe2 On semiconductor, further modify Pt and constructed photocathode as production hydrogen co-catalyst, this photocathode shows very high stabilization Property (more than 10 days);2014, they organized and report Pt/TiO2/CdS/CuInS2Photocathode (Angew.Chem.Int.Ed.2014,53,11808-11812).But such system the problem of existing is CuGaSe2Or CuInS2Semiconductor needs to prepare by the way of atomic layer is deposited, complex operation high to equipment requirement, and by the use of Pt as urging Agent, cost are high.
In recent years, be gradually subject to the people's attention as a kind of cheap p-type semiconductor, NiO, due to NiO band gap compared with Wide (Eg=3.5eV) is, it is necessary to use suitable dyestuff to be sensitized it to expand its utilization to sunshine.2011, grandson Stand into and wait (Chem.Commun.2012,48,988-990) that organic dyestuff (P1) is connected on NiO first, and matched somebody with somebody using cobalt oxime Compound has constructed NiO photocathode of the first case based on molecular photoactive agent and molecular catalyst, but it is catalyzed as co-catalyst Agent and NiO connection function are weaker, in operation, are easily come off from electrode, influence electrode performance.2013, Wu Yiying etc. (J.Am.Chem.Soc.135,32,11696-11699) makees sensitising agent using difunctional Ru complexs, realizes With being connected chemically for NiO electrodes and Co composition catalysts, avoid coming off for catalyst, thus electrode show it is higher Stability.Organic dye molecule be NiO photocathodes frequently with sensitizer, but organic dyestuff synthesis is complicated, with high costs, and And less stable.(the ACS Catalysis 2015, DOI such as Richard professors Eisenberg:10.1021/ Cs5021035) CdSe quantum dot is chemically adsorbed on NiO, is prepared for CdSe/NiO electrodes, and in cobalt or the cooperation produce of nickel Hydrogen catalyst carries out photoelectricity production hydrogen reaction, but obvious problem existing for this system is electricity of the operation needs in organic solvent acetonitrile In electrolyte solution.2014, Liu etc. (ACS Nano 2014,8,10403-10413) was by IrOX nH2O/CdS/TiO2Light anode It is together in series with NiS/CdSe/NiO photocathodes, is prepared for the decomposition water battery of double light absorbing layers, but the load of its quantum dot Respectively by electrochemical deposition and chemical bath deposition mode, it is difficult to control quantum dot size and load capacity on the semiconductor and Distribution.Simultaneously in the case where being not added with passivation layer and catalyst, the efficiency and less stable of system;In addition, prepared by the system It is cumbersome, IrOXCatalyst price is high.Therefore, development prepares simple, cheap, stable material to strengthen nickel oxide or other The light absorbs of p-type semiconductor, the photoelectricity H2-producing capacity for improving photocathode also have many work to do.Preferable optical electro-chemistry is decomposed Aquatic products hydrogen, the optoelectronic pole of production oxygen should possess simple preparation, efficiency high, reproducible, stability is high, catalyst is cheap, universality The advantages of strong.
The content of the invention
The invention solves first technical problem be to provide a kind of optoelectronic pole, it eases up without sacrifice agent, protective layer Photoelectric decomposition aquatic products hydrogen, production oxygen can efficiently and stably be realized by rushing solution, realize conversion of the luminous energy to chemical energy, and with preparation Simply, efficiency high, it is reproducible, to the high conversion rate of visible ray, stability is high, catalyst is cheap, universality is strong the advantages of.
To solve first technical problem, the present invention provides following technical scheme:
A kind of optical electro-chemistry decomposes aquatic products hydrogen, produces the optoelectronic pole of oxygen, it is characterised in that the optoelectronic pole include photocathode and Light anode, and the photocathode and light anode have the quantum dot that assembling is aided in by bifunctional molecule.
Preferably, the bifunctional molecule is selected from sulfydryl phosphoric acid, mercaptan carboxylic acid, the amino acid containing sulfydryl, the height containing sulfydryl One or more in molecule, the polypeptide containing sulfydryl, double carboxyl molecules, pyridine carboxylic acid and thiophene acetic acid.The bifunctional molecule Connection molecule can be used as, some is alternatively arranged as electronics or hole transport relaying body.The bifunctional molecule conduct in the light anode Connection molecule, some are alternatively arranged as electric transmission relaying body.Bifunctional molecule has as connection molecule in the photocathode It is alternatively arranged as hole transport relaying body.
Preferably, the type of the auxiliary assembling is chemisorbed, and the chemisorbed is realized by bifunctional molecule.
Preferably, there is production hydrogen catalyst or production hydrogen catalyst precursor, wherein the production on the quantum dot of the photocathode Hydrogen catalyst or production hydrogen catalyst precursor are that other non-quantum point of the quantum dot or in load in itself produces hydrogen catalyst or production Hydrogen catalyst precursor.
Preferably, the quantum dot in the light anode is loaded with producing VPO catalysts or produces VPO catalysts precursor.
Preferably, the quantum dot is water-soluble quantum dot or oil-soluble quantum dot, it is preferable that the quantum dot is selected from CdS、CdSe、CdTe、CdSe/ZnS、CdSe/ZnSe、CdSe/CdS、ZnSe/CdS、CdTe/CdSe、CdS/ZnSe、CdS/ One or more in ZnS, CdSe/CdS/ZnS and CdTe/CdSe/CdS.
Preferably, production hydrogen catalyst or production the hydrogen catalyst precursor is selected from the metal of iron, cobalt, nickel, copper, molybdenum, zinc or cadmium One or more in salt, metal oxide, sulfide, hydroxide and metal complex;Preferably, the production hydrogen catalyst Or catalyst precarsor is selected from Ni (OH)2、CoCl2、FeCl3、NiCl2、CuCl2、Ni(NO3)2、MoS2, hydrogenase and hydrogenation enzyme simulation One or more in compound;Wherein described hydrogenase simulated compound is iron hydrogenase simulated compound.
Preferably, the production VPO catalysts or produce VPO catalysts precursors be selected from iron, cobalt, nickel, manganese, copper metal oxide, The one or more of sulfide, hydroxide and metal complex.Preferably, the production VPO catalysts or catalyst precarsor are selected from Fe(OH)3、Ni(OH)2、FeOOH、NiOOH、CoOOH、Fe2O3、Co2O3With the one or more in NiO.
The material of the photocathode is p-type metal oxide semiconductor, and it is selected from NiO, CuMO2(M=Cr, Al, Fe, Ga, ) and CuBi In2O4In one or more.
The material of the light anode is n-type metal oxide semiconductor, and it is selected from TiO2、ZnO、Fe2O3And WO3In one Kind is several.
The electrode is that the optical electro-chemistry based on semiconductor, quantum dot and catalyst decomposes aquatic products hydrogen, production oxygen, and can be very Realize optical electro-chemistry decomposition water in the range of wide pH, while can be with by regulating and controlling the size of quantum dot, the species of bifunctional molecule It is conveniently adjusted the performance of optoelectronic pole decomposition water.
The invention solves second technical problem be to provide a kind of optical electro-chemistry and decompose aquatic products hydrogen, production oxygen optoelectronic pole Preparation method.
To solve above-mentioned second technical problem, the present invention uses following technical proposals:
A kind of above-mentioned production hydrogen, the preparation method for producing oxygen optoelectronic pole, including the preparation of photocathode and the preparation of light anode, wherein The preparation method of the photocathode is:One layer of p-type semiconductor film is prepared first, secondly under the auxiliary of bifunctional molecule, in p Type semiconductive thin film over-assemble one or more quantum dot, photocathode is made;The preparation method of wherein light anode is as follows:First Prepare the film of one layer of n-type semiconductor, secondly under the auxiliary of bifunctional molecule n-type semiconductor film over-assemble it is a kind of or A variety of quantum dots, finally VPO catalysts or production VPO catalysts precursor are produced in load over the qds, and light anode is made.
Preferably, the quantum dot wherein on photocathode has production hydrogen catalyst in itself or produces the function of hydrogen catalyst precursor.
A kind of above-mentioned production hydrogen, the preparation method for producing oxygen optoelectronic pole, including the preparation of photocathode and the preparation of light anode, wherein The preparation method of the photocathode is:One layer of p-type semiconductor film is prepared first, secondly under the auxiliary of bifunctional molecule, in p Type semiconductive thin film over-assemble one or more quantum dot, finally hydrogen catalyst or production hydrogen catalyst are produced in load over the qds Precursor, prepare photocathode;The preparation method of wherein light anode is as follows:The film of one layer of n-type semiconductor is prepared first, is secondly existed In n-type semiconductor film over-assemble one or more quantum dot under the auxiliary of bifunctional molecule, finally load over the qds VPO catalysts or production VPO catalysts precursor are produced, light anode is made.
The preparation method of the film of the p-type semiconductor and the film of n-type semiconductor includes silk-screen printing, doctor blade method, molten Sol-gel, spin-coating method, preferably silk-screen printing;The thickness of the semiconductive thin film is 200nm~10 μm;Preferably, it is described The carrying method for producing hydrogen catalyst, production hydrogen catalyst precursor, production VPO catalysts and production VPO catalysts precursor is drop coating, dipping, change Learn the one or more in water-bath deposition, continuous ionic layer absorption deposition, electrochemical deposition and chemisorbed.
A kind of application using above-mentioned production hydrogen, production oxygen optoelectronic pole hydrogen production by water decomposition, oxygen processed, comprise the following steps that:Group first Packed battery;Secondly, the battery is placed in the electrolyte solution of certain pH;Apply certain bias to the battery, be used in combination Light source is irradiated to it;Finally, the generation of electric current and gas is detected.
The battery is by single photocathode or single light anode combination reference electrode, to electrode, three electrodes of composition System;Or photocathode and light anode are composed in series two electrode systems;The scope that preferably three-electrode system is biased is 0 ~-0.8V (vs. reference electrodes);The scope that preferably two electrode systems are biased is 0.8~-0.8V (vs. is to electrode);It is excellent Electrolyte solution described in selection of land is selected from Na2SO4、K2SO4、KNO3、NaNO3、Na3PO4、K3PO4、K2CO3、Na2CO3、K2HPO4、 Na2HPO4、KH2PO4And NaH2PO4In one or more of aqueous solution;The scope of the pH is 1~14;Preferably, the light Source is selected from sunshine, incandescent lamp, xenon lamp, LEDs, laser, solar simulator or high-pressure sodium lamp.
Beneficial effects of the present invention are as follows:
1) invention realize based on p-type and n-type semiconductor, the optical electro-chemistry of quantum dot and catalyst decompose aquatic products hydrogen, Produce the foundation of oxygen optoelectronic pole;
2) optoelectronic pole can efficiently and stably decomposition water without electronics sacrificial body, cushioning liquid;
3) optoelectronic pole obtains the water-based energy of very high photoelectric decomposition under conditions of not additional production hydrogen catalyst;
4) relaying body in the optoelectronic pole hole has fabulous separation and laser propagation effect for quantum dot photohole;
5) optoelectronic pole is simple to operate, reproducible, stability is good, universality is strong, the utilization ratio height to visible ray;Urge Agent does not need noble metal, cheap and easy to get.
Brief description of the drawings
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows the uv-visible absorption spectra and emission spectrum spectrogram of CdS quantum dot.
Fig. 2 shows the uv-visible absorption spectra spectrogram of CdSe quantum dot and CdSe/ZnS quantum dots.
Fig. 3 shows the emission spectrum spectrogram of CdSe quantum dot and CdSe/ZnS quantum dots.
Fig. 4 shows the shape appearance figure that CdS quantum dot is observed under high-resolution-ration transmission electric-lens (HRTEM).
Fig. 5 shows the shape appearance figure that CdSe/ZnS quantum dots are observed under high-resolution-ration transmission electric-lens (HRTEM).
Fig. 6 shows the electrode decomposition water schematic diagram of nickel oxide/quantum dot/production hydrogen catalyst in embodiment 1.
Fig. 7 shows the cathode current versus time curve of embodiment 2.
Fig. 8 shows cathode current versus time curve in embodiment 3.
Fig. 9 shows anode current versus time curve caused by photocathode in example 4.
Figure 10 shows the electric current versus time curve of the electrode of embodiment 5.
Figure 11 is the electric current versus time curve of the electrode of embodiment 6.
Figure 12 shows the electric current versus time curve of embodiment 7.
Figure 13 shows the cathode current versus time curve in embodiment 9.
Figure 14 shows the electric current versus time curve in embodiment 11.
Figure 15 is the electric current versus time curve of embodiment 12.
Figure 16 shows the Monitoring Data that gas is composed in embodiment 13.
Figure 17 shows the structural formula of cobalt complex in embodiment 14.
Figure 18 shows oxygen detection curve in embodiment 15.
Figure 19 shows the electric current versus time curve in embodiment 17.
Figure 20 shows the light anode decomposition water schematic diagram in embodiment 18.
Figure 21 shows the electric current versus time curve in embodiment 18.
Figure 22 shows double optoelectronic pole decomposition water schematic diagrames in embodiment 19.
Figure 23 shows the electric current versus time curve of the electrode in embodiment 19.
Figure 24 shows X-ray diffraction (XRD) collection of illustrative plates of the ZnO/CdS in embodiment 20.
Figure 25 shows the structural formula of the cobalt complex of embodiment 22.
Figure 26 shows the scanning electron microscope (SEM) photograph of the ZnO nanorod in embodiment 23.
Figure 27 shows the scanning electron microscope (SEM) photograph of the FeOOH nanotubes in embodiment 24.
Figure 28 shows TiO in embodiment 252The scanning electron microscope (SEM) photograph of nanometer rods.
Embodiment
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
The preparation of quantum dot:
Quantum dot bibliography is made.The present invention is exemplified below:Exemplified by synthesizing CdS quantum dot, experimental procedure includes:
1. accurately weigh 0.2284g CdCl2·5/2H2O in 500ml round-bottomed flasks, add 190ml deionized waters by its Dissolving.
2. 1ml mercaptopropionic acids are added, stirring, degasification 30min.
3. 10M sodium hydroxide solutions are added dropwise under fast stirring, it is observed that solution is changed into blue and white from clarifying Turbid solution, then become clarification.Then pH value is adjusted to 7 or so with 1M sodium hydroxide solutions.
4. add 10ml 0.1M Na2S solution (weighs 0.24018g Na2S·9H2O, with 10.0ml deionized water dissolvings Both).
5. stirring at normal temperature reacts 3.5h.
Other quantum dots synthesis reference literature (APL Materials 2014,2 (1), 012104;J.Phys.Chem.C 2008,112,8587-8593)。
Fig. 1,2,3 are the uv-visible absorption spectra of CdS quantum dot, CdSe quantum dot and CdSe/ZnS quantum dots respectively With emission spectrum spectrogram, excitation wavelength is all 400nm.It can be seen that the first absworption peak of CdSe quantum dot is located at 430nm or so;First absworption peak of CdS quantum dot is located at 390nm or so;First absworption peak of CdSe/ZnS quantum dots is located at 450nm or so.In the case where 400nm light excites, emission peak of the CdSe quantum dot at 470nm is its band-edge emission, the hair at 600nm Peak is penetrated for its defect to launch;Emission peak at 490nm and 600nm two be present in CdSe/ZnS quantum dots.
Fig. 4,5 are CdS quantum dot and CdSe/ZnS quantum dots respectively with being dropped in after water ultrasonic disperse in ultrathin carbon films, The shape appearance figure observed under HRTEM (high-resolution-ration transmission electric-lens).It can be seen that the average-size of CdS quantum dot is 3.0 ±0.3nm;CdSe/ZnS quantum dots are unbodied club shaped structure.Can by control synthesize reaction time of quantum dot, temperature, The species and proportioning of stabilizer synthesize to obtain different-shape and the quantum dot of structure.
Embodiment 1
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface first with screen printing technique and is prepared into To nickel oxide film;Then the CdSe quantum dot prepared is adsorbed onto nickel oxide film surface using the means of chemisorbed, Bifunctional molecule is TGA;The method that deposition is finally adsorbed using continuous ionic layer is prepared into quantum dot by hydrogen catalyst is produced Surface, production hydrogen catalyst are Ni (OH)2, photocathode is made with this.
The negative electrode prepared is connected in photoelectrochemistrpool pool, adds Na2SO4Electrolyte (pH=7), platinized platinum are used as to electricity Pole, Ag/AgCl electrodes build optical electro-chemistry as reference electrode and decompose water battery.Light source (p=100mW/cm is used as by the use of xenon lamp2) Irradiate photocathode (working electrode) and apply certain bias (- 0.3V vs. reference electrodes), with gas-chromatography (TCD thermal conductivities Detector) detect the hydrogen generated in reaction.The electrode decomposition water signal of nickel oxide/quantum dot/production hydrogen catalyst made from Fig. 6 Figure.
Embodiment 2
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film;Then the CdSe quantum dot prepared is adsorbed onto nickel oxide film surface using the means of chemisorbed, connected Molecule is mercaptopropionic acid;Photocathode is made with this.
The photocathode prepared is connected in photoelectrochemistrpool pool, adds Na2SO4Electrolyte (pH=7), platinized platinum conduct pair Electrode, Ag/AgCl electrodes build photoelectrochemical cell as reference electrode.Light source (p=100mW/cm is used as by the use of xenon lamp2) irradiation Photocathode (working electrode) and apply certain bias (- 0.3V vs. reference electrodes), with gas-chromatography (TCD Thermal Conductivities Device) detect the hydrogen generated in reaction.Fig. 7 is nickel oxide/cathode current versus time curve caused by quantum point electrode. As we can see from the figure under the same conditions, this life of nickel oxide can only produce extremely faint cathode current;QDs is sensitized it Afterwards, cathode current is sharply increased to close -60 μ A/cm2;This result can surmount the photocathode document report based on nickel oxide Peak.
Embodiment 3
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film;Then the CdSe quantum dot prepared is adsorbed onto nickel oxide film surface using the means of chemisorbed, connected Molecule is mercaptopropionic acid, and photocathode is made with this.
The photocathode prepared is connected in photoelectrochemistrpool pool, (pH=9), platinized platinum conduct pair in sodium sulphate electrolyte Electrode, Ag/AgCl electrodes build photoelectrochemical cell as reference electrode.Light source (p=100mW/cm is used as by the use of xenon lamp2) irradiation Photocathode (working electrode) and apply certain bias (- 0.3V vs. reference electrodes), with gas-chromatography (TCD Thermal Conductivities Device) detect the hydrogen generated in reaction.Fig. 8 is nickel oxide/cathode current versus time curve caused by quantum point electrode.
Embodiment 4
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film;Then the CdS quantum dot prepared is adsorbed onto nickel oxide film surface, connection point using the means of chemisorbed Son is mercaptohexanoic acid, finally loads to quantum dot surface by hydrogen catalyst is produced using the method for dipping, production hydrogen catalyst is Co (NO3)2, photocathode is made with this.
The photocathode prepared is connected in photoelectrochemistrpool pool, in Na2SO4(pH=12), platinized platinum conduct pair in electrolyte Electrode, Ag/AgCl electrodes build photocathode system as reference electrode.Light source (p=100mW/cm is used as by the use of xenon lamp2) irradiation light Negative electrode (working electrode) and apply certain bias (- 0.3V vs. reference electrodes).Fig. 9 is caused by photocathode in example 4 Cathode current versus time curve.The cathode current of photocathode is about -22 μ A/cm as we can see from the figure2
Embodiment 5
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film;Then the CdSe quantum dot prepared is adsorbed onto nickel oxide film surface using the means of chemisorbed, connected Molecule is mercaptopropionic acid;Finally hydrogen catalyst being produced using the method for dipping and being prepared into quantum dot surface, production hydrogen catalyst is CoCl2, photocathode is made with this,
(pH=5), platinized platinum are used as in sodium sulphate electrolyte builds light to electrode, Ag/AgCl electrodes as reference electrode Cathode systems.Light source (p=100mW/cm is used as by the use of xenon lamp2) irradiation photocathode (working electrode) and apply certain bias (- 0.3V vs. reference electrodes).Figure 10 is cathode current versus time curve caused by photocathode in example 5.Can from figure To see that photoelectric current is about -7 μ A/cm2
Embodiment 6
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film, the CdS quantum dot prepared is then adsorbed onto nickel oxide film surface, connection point using the means of chemisorbed Son is TGA;Finally hydrogen catalyst being produced using the mode of chemical drop coating and being prepared into quantum dot surface, production hydrogen catalyst is NiCl2, photocathode is made with this.
In Na2SO4(pH=7), platinized platinum are used as in electrolyte builds time to electrode, Ag/AgCl electrodes as reference electrode Polar body system.Light source (p=100mW/cm is used as by the use of xenon lamp2) irradiation photocathode (working electrode) and apply certain bias (- 0.1V vs. reference electrodes).Figure 11 is cathode current versus time curve caused by photocathode in example 6.Can from figure To see that photoelectric current is about -48 μ A/cm2
Embodiment 7
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Titania nanoparticles are carried on tin dope conductive glass surface using screen printing technique and are prepared Titanium deoxid film;Then the CdS quantum dot prepared is adsorbed onto titanium deoxid film surface using the means of chemisorbed, Bifunctional molecule is mercaptohexanoic acid, finally loads to quantum dot surface by VPO catalysts are produced using the method for chemical thought, Production VPO catalysts are Co2O3Nano particle.Figure 12 is the material object for the titanium dioxide/quantum dot/catalyst film electrode being prepared Figure.
Embodiment 8
With embodiment 1, change is that quantum dot is CdSe/ZnS, and bifunctional molecule is mercaptohexanoic acid.
Embodiment 9
With embodiment 6, change is that application voltage is 0V.Changes of the Figure 13 for electric current caused by photocell in example 9 with the time Change curve.Photoelectric current is about -40 μ A/cm as can see from Figure 132
Embodiment 10
With embodiment 1, change is that semiconductor is CdS, and bifunctional molecule is glutathione.
Embodiment 11
With embodiment 3, composition is CuBi in metal oxide layer2O4, production hydrogen catalyst is the mixing of nickel chloride and cobalt chloride (the amount ratio of material is 2 to thing:1).Change curves of the Figure 14 for cathode current caused by photocathode in example 11 with illumination, from figure It can be seen that cathode current is about -11 μ A/cm under the conditions of being somebody's turn to do2
Embodiment 12
With embodiment 3, composition is CuCrO in metal oxide layer2, quantum dot CdS, CdSe and CdS/ZnSe (dosage 1:1:1).Figure 15 be example 12 in cathode current caused by photocathode with illumination change curve, as we can see from the figure this Cathode current is about -16 μ A/cm under part2
Embodiment 13
With embodiment 6, change is that production hydrogen catalyst is molybdenum disulfide.Figure 16 is the Monitoring Data that gas is composed in example 13.
Embodiment 14
With embodiment 6, change is that production hydrogen catalyst is cobalt complex.Figure 17 is the structural formula of cobalt complex in example 14.
Embodiment 15
With embodiment 5, change is that composition is CuAlO in semiconductor layer2, production hydrogen catalyst is the complex of cobalt.Figure 18 is Oxygen detection curve in example 15.
Embodiment 16
With embodiment 3, composition is CuCrO in metal oxide layer2, quantum dot CdSe/ZnS.
Embodiment 17
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film, the CdTe quantum prepared is then adsorbed onto nickel oxide film surface using the means of chemisorbed, connect Molecule is TGA;Finally hydrogen catalyst being produced using the method for dipping and being prepared into quantum dot surface, production hydrogen catalyst is NiCl2, photocathode is made with this.
Photocathode and light anode are together in series, light anode is the TiO prepared by embodiment 72/ CdS electrodes, are made with xenon lamp For light source (p=100mW/cm2) while irradiate photocathode and light anode, it is biased as 0V.Figure 19 is photocell in example 17 Caused electric current versus time curve.Photoelectric current is about -6 μ A/cm as we can see from the figure2
Embodiment 18
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Titania nanoparticles are carried on tin dope conductive glass surface using screen printing technique and are prepared Titanium deoxid film;Then the CdS quantum dot prepared is adsorbed onto titanium deoxid film surface using the means of chemisorbed, Bifunctional molecule is mercaptohexanoic acid, finally loads to quantum dot surface by VPO catalysts are produced using the method for chemical thought, Production VPO catalysts are Co2O3Nano particle, light anode is made.
The light anode prepared is connected in photoelectrochemistrpool pool, using pure water as solvent, platinized platinum is as to electrode, Ag/ AgCl electrodes build photocathode system as reference electrode.Light source (p=100mW/cm is used as by the use of xenon lamp2) irradiation photocathode (work Make electrode) and apply certain bias (0.5V vs. reference electrodes).Figure 20 is light anode decomposition water schematic diagram in example 18, Figure 21 is anode current versus time curve caused by light anode.The sun of CdS quantum dot light anode as we can see from the figure Electrode current is about 100 μ A/cm2
Embodiment 19
A kind of method for the hydrogen production by water decomposition oxygen that aquatic products hydrogen production oxygen optoelectronic pole is decomposed based on optical electro-chemistry, including following step Suddenly:
Nickel oxide nanoparticle is carried on tin dope conductive glass surface using screen printing technique and oxygen is prepared Change nickel film;Then the CdSe quantum dot prepared is adsorbed onto nickel oxide film surface, double work(using the means of chemisorbed Energy molecule is mercaptopropionic acid;The method that deposition is finally adsorbed using continuous ionic layer is prepared into quantum dot table by hydrogen catalyst is produced Face, production hydrogen catalyst are Ni (OH)2, photocathode is made with this;
Titania nanoparticles are carried on into tin dope using screen printing technique to lead glass surface and be prepared two Thin film of titanium oxide;Then the CdS quantum dot prepared is adsorbed onto titanium deoxid film surface using the means of chemisorbed, it is double Functional molecular is mercaptohexanoic acid, finally loads to quantum dot surface by VPO catalysts are produced using the method for drop coating, produces VPO catalysts For Co2O3Nano particle, light anode is made with this;
Photocathode and light anode are together in series, light source (p=100mW/cm is used as by the use of xenon lamp2) while irradiate photocathode and Light anode, it is biased as 0V (vs. is to electrode).Figure 22 is double optoelectronic pole decomposition water schematic diagrames in example 19, and Figure 23 is implementation Caused electric current versus time curve in example 19.Photoelectric current is about -10 μ A/cm as we can see from the figure2
Embodiment 20
With embodiment 18, change is that semiconductor is ZnO, and Figure 24 is the XRD spectra of ZnO-CdS electrodes.
Embodiment 21
With embodiment 19, production VPO catalysts are cobalt complex.Figure 25 is the structural formula of cobalt complex in example 21.
Embodiment 22
With embodiment 5, change is that electrolyte solution is K2HPO4 solution.
Embodiment 23
With embodiment 18, change is that semiconductor is ZnO.ZnO pattern is nanometer rods.Figure 26 is the scanning of ZnO nanorod Electron microscope.As can be seen from the figure TiO2The length of nanometer rods is about 4.5 μm, and diameter is about 350nm.
Embodiment 24
With embodiment 7, change is to load to quantum dot surface by VPO catalysts are produced using the method for electrochemical deposition, produces oxygen Catalyst is FeOOH nanotube.Figure 27 is the scanning electron microscope (SEM) photograph of FeOOH nanotube.As can be seen from the figure FeOOH nanometer tube walls are about 30nm, and external diameter is about 150nm, and internal diameter is about 90nm.
Embodiment 25
With embodiment 7, change is that collosol and gel mode prepares TiO2Nanometer rods light anode.Figure 28 is TiO2Nanometer rods are swept Electron microscope is retouched, as can be seen from the figure TiO2The length of nanometer rods is about 5 μm, and diameter is about 200nm.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description To make other changes in different forms, all embodiments can not be exhaustive here, it is every to belong to this hair Row of the obvious changes or variations that bright technical scheme is extended out still in protection scope of the present invention.

Claims (10)

1. a kind of optical electro-chemistry decomposes aquatic products hydrogen, produces the optoelectronic pole of oxygen, it is characterised in that the optoelectronic pole includes photocathode and light Anode, and the photocathode and light anode have the quantum dot that assembling is aided in by bifunctional molecule;
There is production hydrogen catalyst or production hydrogen catalyst precursor on the quantum dot of the photocathode;It is described production hydrogen catalyst be selected from iron, One or more in cobalt, nickel, the metal oxide of copper, sulfide, hydroxide and metal complex;The production hydrogen catalyst Precursor selected from iron, cobalt, nickel, copper, molybdenum, zinc, cadmium metal salt in one or more;
Quantum dot in the light anode is loaded with producing VPO catalysts;The production VPO catalysts are selected from iron, cobalt, nickel, manganese, the gold of copper Belong to the one or more of oxide, hydroxide and metal complex.
2. production hydrogen according to claim 1, the optoelectronic pole for producing oxygen, it is characterised in that the bifunctional molecule is selected from sulfydryl One or more in phosphoric acid, mercaptan carboxylic acid, the amino acid containing sulfydryl, double carboxyl molecules, pyridine carboxylic acid and thiophene acetic acid.
3. production hydrogen according to claim 1, the optoelectronic pole for producing oxygen, it is characterised in that the material of the photocathode is p-type gold Belong to oxide semiconductor, it is selected from NiO, CuCrO2、CuAlO2、CuFeO2、 CuGaO2、CuInO2And CuBi2O4In one kind or It is several.
4. production hydrogen according to claim 1, the optoelectronic pole for producing oxygen, it is characterised in that the material of the light anode is n-type gold Belong to oxide semiconductor, it is selected from TiO2、ZnO、Fe2O3And WO3In one or more.
5. production hydrogen according to claim 1, the optoelectronic pole for producing oxygen, it is characterised in that the quantum dot is water-soluble quantum Point or oil-soluble quantum dot.
6. it is according to claim 5 production hydrogen, produce oxygen optoelectronic pole, it is characterised in that the quantum dot be selected from CdS, CdSe, CdTe、CdSe/ZnS、CdSe/ZnSe、CdSe/CdS、ZnSe/CdS、CdTe/CdSe、CdS/ZnSe、CdS/ZnS、CdSe/ One or more in CdS/ZnS and CdTe/CdSe/CdS.
7. production hydrogen according to claim 1, the optoelectronic pole for producing oxygen, it is characterised in that
The production hydrogen catalyst is selected from Ni (OH)2、MoS2, one or more in hydrogenase and hydrogenase simulated compound;
The production hydrogen catalyst precursor is selected from CoCl2、FeCl3、NiCl2、CuCl2、Ni(NO3)2In one or more.
8. production hydrogen according to claim 1, the optoelectronic pole for producing oxygen, it is characterised in that the production VPO catalysts are selected from Fe (OH)3、Ni(OH)2、FeOOH、NiOOH、CoOOH、Fe2O3、Co2O3With the one or more in NiO.
9. a kind of any described production hydrogen of claim 1-7, the preparation method for producing oxygen optoelectronic pole, include preparation and the light of photocathode The preparation of anode, wherein the preparation method of the photocathode is:First using silk-screen printing, doctor blade method, sol-gal process, spin coating One kind in method prepares one layer of p-type semiconductor film, secondly under the auxiliary of bifunctional molecule, the group on p-type semiconductor film One or more kinds of quantum dots are filled, finally hydrogen catalyst or production hydrogen catalyst precursor are produced in load over the qds, prepare time Pole;The preparation method of wherein light anode is as follows:First using one kind in silk-screen printing, doctor blade method, sol-gal process, spin-coating method Prepare the film of one layer of n-type semiconductor, secondly under the auxiliary of bifunctional molecule n-type semiconductor film over-assemble it is a kind of or A variety of quantum dots, finally using drop coating, dipping, chemical thought, continuous ionic layer absorption deposition, electrochemical deposition and chemistry One or more of production VPO catalysts of load over the qds in absorption, are made light anode.
10. a kind of production hydrogen as claimed in claim 9, the preparation method for producing oxygen optoelectronic pole, it is characterised in that the p-type is partly led The preparation method of the film of body and the film of n-type semiconductor is silk-screen printing;The thickness of the semiconductive thin film is 200 nm ~ 10 μm。
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