CN105457626A - Preparation method and application of concave-surface bismuth tungstate nanosheet electrocatalyst - Google Patents
Preparation method and application of concave-surface bismuth tungstate nanosheet electrocatalyst Download PDFInfo
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- CN105457626A CN105457626A CN201610048941.1A CN201610048941A CN105457626A CN 105457626 A CN105457626 A CN 105457626A CN 201610048941 A CN201610048941 A CN 201610048941A CN 105457626 A CN105457626 A CN 105457626A
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- bismuth tungstate
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- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 46
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 46
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000002135 nanosheet Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000010411 electrocatalyst Substances 0.000 title abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims description 57
- 238000003756 stirring Methods 0.000 claims description 47
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 36
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 20
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 claims description 20
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 19
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000006227 byproduct Substances 0.000 claims description 9
- 238000005119 centrifugation Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 5
- 150000004780 naphthols Chemical class 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 abstract description 16
- 239000001301 oxygen Substances 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 14
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000010970 precious metal Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 16
- 230000003197 catalytic effect Effects 0.000 description 8
- 238000006555 catalytic reaction Methods 0.000 description 8
- 238000007664 blowing Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002761 deinking Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000005518 electrochemistry Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 241001198704 Aurivillius Species 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000002003 electron diffraction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000006053 organic reaction Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/31—Chromium, molybdenum or tungsten combined with bismuth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9041—Metals or alloys
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Metallurgy (AREA)
- Catalysts (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention discloses a preparation method and application of a concave-surface bismuth tungstate nanosheet electrocatalyst and belongs to the field of inorganic nanometer electrocatalysis materials. A concave-surface bismuth tungstate nanosheet is synthesized through a solvothermal route, the average side length of the obtained product is about 80 mm, and the thickness of the obtained product is 20 nm. The concave-surface nanosheet can efficiently decompose water at room temperature to generate oxygen under a nearly-neutral condition. Under the voltage of 1.77 V, current density of 10 mA cm-2 can be reached, the concave-surface bismuth tungstate nanosheet is obviously better than a bismuth tungstate nanosheet with a flat surface, and the concave-surface bismuth tungstate nanosheet electrocatalyst is equal to that of other existing non-precious-metal electrocatalysts. After 500 times of cyclic use, the catalyst can still keep good stability. The preparation method is easy to implement, the source of raw materials is rich, the cost is low, the preparation period of the product is short, repeatability is good, large-scale preparation can be achieved, and the product has good application prospects.
Description
Technical field
The present invention relates to inorganic nano electrocatalysis material technical field, particularly relate to a kind of preparation method and application of concave surface Bismuth tungstate nano-sheet eelctro-catalyst.
Background technology
Electro-catalysis is the heterocatalysis occurring in electrode and electrolyte interface, relates to the cross discipline of numerous subsciences such as electrochemistry, Surface Science, material science.Electro-catalysis extensively exists and is applied to energy conversion and storage (fuel cell; chemical cell, ultracapacitor, Hydrogen Energy); environmental protection (sewage disposal, electrochemical sensor, degraded organic waste materials, ozone generation etc.); novel substance synthesis and material preparation (electro-organic synthesis, nano material, functional material); Electrochemical Engineering (chlorine industry; intermetallic composite coating, shaping, finish etc.), and in the electrochemical process in the field such as biology, analysis.In new and high technology, the solution of electro-catalysis problem also plays a part key.
At present, the forward position of Study of electrocatalysis concentrates on from microstructure hierarchical Design and development high-performance electric catalyst, from molecular level understanding electricity-catalyze mechanism and control electro-catalysis process; By the development of Nanometer scale science and technology, realize the regulation and control surface atom arrangement architecture of eelctro-catalyst and electronic structure, thus regulate and control its selective to chemical reaction, and greatly strengthen its catalytic activity and stability.Electrocatalytic decomposition water comprises electro-catalysis product oxygen and hydrogen two half-reactions are produced in electro-catalysis.Produce oxygen due to electrochemistry and relate to four electronic transfer process, thus the electro-catalysis comparing two electronics produce hydrogen process more slowly, more difficult.The noble metal of current extensive use is analysed oxygen eelctro-catalyst and is comprised Pt, RuO
2and IrO
2, but the reserves of these noble metals are rare, price is high, limit its extensive use.For this problem, in recent years, develop successively some contain transition metals cobalt, manganese, nickel analyse oxygen eelctro-catalyst.But these analyse oxygen eelctro-catalyst needs just can demonstrate good electrocatalysis characteristic usually under strong acid or basic conditions.
For practical application, decomposition water under near-neutral sulfite deinking, then significantly can reduce cost, expands the scope of application of catalyst.But up to the present, the base metal rare exploitation of aquatic products oxygen significantly can be decomposed under near-neutral sulfite deinking.
Bi
2wO
6be the simplest Aurivillius type oxide of a kind of structure, its energy gap narrower (being about 2.7eV), can absorption portion visible ray.This material has been used to photocatalysis degradation organic contaminant, photocatalysis organic reaction and photochemical catalyzing.The Bi of various nanostructured
2wO
6be synthesized out, comprise multilevel hierarchy microballoon, hollow ball, smooth nanometer sheet.But, non-modified, the Bi of these nanostructureds
2wO
6do not possess the performance of electrocatalytic decomposition aquatic products oxygen.
Summary of the invention
For the deficiencies in the prior art, the present invention aims to provide a kind of preparation method and application of concave surface Bismuth tungstate nano-sheet eelctro-catalyst, by controlling synthesis condition, Lacking oxygen is utilized to improve the electric conductivity of material, the nanometer sheet of highly active concave structure that utilized the selective absorption of oleyl amine to construct, and its catalytic activity of material is improved by the synergy of defect project and crystal face engineering, have developed can at the Bi of the effective catalytic decomposition water of near-neutral sulfite deinking
2wO
6nanometer sheet.In weakly acidic pH water, this concave surface Bi
2wO
6nanometer sheet is showed than smooth Bi
2wO
6the electro catalytic activity that nanometer sheet is higher, is better than existing base metal and analyses oxygen eelctro-catalyst.
To achieve these goals, the present invention adopts following technical scheme:
A preparation method for concave surface Bismuth tungstate nano-sheet eelctro-catalyst, comprises the steps:
(1) first bismuth nitrate is dissolved in ethanol, stirs and make it dissolve completely, be designated as solution A; Sodium tungstate is soluble in water, stir and make it dissolve completely, be designated as B solution; The mol ratio of bismuth nitrate and sodium tungstate is 4: 1-1: 4;
(2) B solution to be joined in solution A and to stir;
(3) add the oleyl amine of 3-8mL to the mixed solution in step (2), and continue to stir;
(4) in autoclave, add the solution finally obtained in step (3), drying box is put into after being sealed by autoclave, isothermal reaction 4-10h at 220 DEG C, after reaction terminates, naturally cool to room temperature, after being taken out by product, centrifugation obtains solid concave surface Bismuth tungstate nano-sheet Bi
2wO
6.
Further, step (5) is also comprised: by the solid concave surface Bismuth tungstate nano-sheet Bi obtained in step (4)
2wO
63-8mg is scattered in 1mL aqueous isopropanol, ultrasonic 30min, then adds the naphthols of 40 μ L, continues ultrasonic 30min; Pipette the amount of 5 μ L on the glass-carbon electrode prepared with liquid-transfering gun, spend the night measurement chemical property.
Further, in step (1), the mol ratio of bismuth nitrate and sodium tungstate is 1: 2.
Further, in step (2), whipping temp is 25 DEG C, and mixing time is 30min.
Further, in step (3), oleyl amine addition is 5mL, and mixing time is 30min.
Further, in step (4), after putting into drying box after being sealed by autoclave, at 220 DEG C, react 6h.
Further, in step (4), be lined with polytetrafluoroethylene (PTFE) in the inner bag of autoclave, drying box is Constant Temp. Oven.
Further, in step (5), solid concave surface Bismuth tungstate nano-sheet Bi
2wO
6addition be 5mg.
Further, in step (5), aqueous isopropanol is primarily of isopropyl alcohol and water mixing gained, and wherein the volume ratio of isopropyl alcohol and water is 2: 1.
The concave surface Bismuth tungstate nano-sheet eelctro-catalyst utilizing above-mentioned preparation method to obtain can be applicable to electrocatalytic decomposition water, fuel cell, lithium-air battery.
Advantageous Effects of the present invention is:
1, oleyl amine has reproducibility, can cause Bi in product
2wO
6tungsten ion in nanometer sheet is reduced, produce corresponding Lacking oxygen, Lacking oxygen can improve the electric conductivity of material, the nanometer sheet of highly active concave structure has been constructed in the selective absorption of oleyl amine, thus its catalytic activity of material is improved by the synergy of defect project and crystal face engineering, have developed can at the Bi of the effective catalytic decomposition water of near-neutral sulfite deinking
2wO
6nanometer sheet.In weakly acidic pH water, the concave surface Bi that preparation method of the present invention obtains
2wO
6nanometer sheet is showed than smooth Bi
2wO
6the electro catalytic activity that nanometer sheet is higher, is better than existing base metal and analyses oxygen eelctro-catalyst, is expected to be applied to electrocatalytic decomposition water, the various fields such as fuel cell, lithium-air battery;
2, simple to operate, raw material is green, cost is low, and product manufacturing cycle is short, and reproducible, can scale preparation.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph of concave surface Bismuth tungstate nano-sheet prepared by the embodiment of the present invention 1;
Fig. 2 is the X-ray diffraction style that the concave surface Bismuth tungstate nano-sheet powder of the embodiment of the present invention 1 preparation is tested on the D8ADVANCEX-x ray diffractometer x of German BRUKER company;
Fig. 3 is the transmission electron microscope picture taken at the TecnaiG2F30 transmission electron microscope of FEI Co. of the U.S. of concave surface Bismuth tungstate nano-sheet powder prepared by the embodiment of the present invention 1 and SEAD style, wherein 3a in figure) the transmission electron microscope picture of concave surface bismuth tungstate, 3b in figure) choose electron diffraction diagram;
Fig. 4 is the energy spectrogram of concave surface Bismuth tungstate nano-sheet prepared by embodiment 1;
Fig. 5 is that curve swept by the electrochemistry line of the concave surface Bismuth tungstate nano-sheet that embodiment 1 is synthesized;
Fig. 6 is that curve swept by the line of concave surface Bismuth tungstate nano-sheet after 500 circle cyclic voltammetrics that embodiment 1 is synthesized;
Fig. 7 is the stereoscan photograph of the smooth Bismuth tungstate nano-sheet according to embodiment 3 synthesis;
Fig. 8 is that concave surface Bismuth tungstate nano-sheet compares with the chemical property of smooth Bismuth tungstate nano-sheet.
Detailed description of the invention
Below with reference to accompanying drawing, the invention will be further described, it should be noted that, the present embodiment, premised on the technical program, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to the present embodiment.
A preparation method for concave surface Bismuth tungstate nano-sheet eelctro-catalyst, comprises the steps:
(1) first bismuth nitrate is dissolved in ethanol, stirs and make it dissolve completely, be designated as solution A; Sodium tungstate is soluble in water, stir and make it dissolve completely, be designated as B solution; The mol ratio of bismuth nitrate and sodium tungstate is 4: 1-1: 4;
(2) B solution to be joined in solution A and to stir;
(3) add the oleyl amine of 3-8mL to the mixed solution in step (2), and continue to stir 30min;
(4) in autoclave, add the solution of step (3), drying box is put into, isothermal reaction 4-10h at 220 DEG C, after reaction terminates after being sealed by autoclave, naturally cool to room temperature, after being taken out by product, centrifugation obtains solid concave surface Bismuth tungstate nano-sheet Bi
2wO
6.
Further, step (5) is also comprised: by the solid concave surface Bismuth tungstate nano-sheet Bi obtained in step (4)
2wO
63-8mg is scattered in 1mL aqueous isopropanol, ultrasonic 30min, then adds the naphthols of 40 μ L, continues ultrasonic 30min; Pipette the amount of 5 μ L on the glass-carbon electrode prepared with liquid-transfering gun, spend the night measurement chemical property.
Further, in step (1), the mol ratio of bismuth nitrate and sodium tungstate is 1: 2.
Further, in step (2), whipping temp is 25 DEG C, and mixing time is 30min.
Further, in step (3), oleyl amine addition is 5mL, and mixing time is 30min.
Further, in step (4), after putting into drying box after being sealed by autoclave, at 220 DEG C, react 6h.
Further, in step (4), be lined with polytetrafluoroethylene (PTFE) in the inner bag of autoclave, drying box is Constant Temp. Oven.
Further, in step (5), solid concave surface Bismuth tungstate nano-sheet Bi
2wO
6addition be 5mg.
Further, in step (5), aqueous isopropanol is primarily of isopropyl alcohol and water mixing gained, and wherein the volume ratio of isopropyl alcohol and water is 2: 1.
The concave surface Bismuth tungstate nano-sheet eelctro-catalyst utilizing above-mentioned preparation method to obtain can be applicable to electrocatalytic decomposition water, fuel cell, lithium-air battery.
Embodiment 1
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 5mL oleyl amine, then continue to stir 30min, put into electric heating constant-temperature blowing drying box by after reactor good seal, isothermal reaction 6h at 220 DEG C.Question response terminates and after naturally cooling to room temperature, is taken out by product and carry out centrifugation, after drying, can obtain solid concave surface Bismuth tungstate nano-sheet powder.
As shown in Figure 1, can find out that the nanometer sheet prepared by embodiment 1 method is concave surface nanometer sheet by ESEM.And as shown in Figure 2, from x-ray analysis, described concave surface nanometer sheet is the bismuth tungstate of orthorhombic phase.As shown in Figure 3,3a from figure) transmission electron microscope photo more clearly surperficial synthetic material be concave surface nanometer sheet, and from figure 3b) this nanometer sheet of SEAD surface there is mono-crystalline structures.As shown in Figure 4, qualitative from power spectrum, containing bismuth, tungsten, oxygen element in product.The known bismuth of quantitative calculating: tungsten: the ratio of oxygen is about 2: 1: 3.9.
Embodiment 2
Take 2mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 0.5mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Other condition is consistent with embodiment 1.Final products are through being characterized by concave surface Bi
2wO
6nanometer sheet.
Embodiment 3
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 2mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Other condition is consistent with embodiment 1.Final products are through being characterized by concave surface Bi
2wO
6nanometer sheet.
Embodiment 4
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 3mL oleyl amine, then continue to stir 30min, put into electric heating constant-temperature blowing drying box by after reactor good seal, isothermal reaction 6h at 220 DEG C.Question response terminates and after naturally cooling to room temperature, is taken out by product to carry out centrifugation and after drying.Final products are through being characterized by concave surface Bi
2wO
6nanometer sheet.
Embodiment 5
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 8mL oleyl amine, then continue to stir 30min, put into electric heating constant-temperature blowing drying box by after reactor good seal, isothermal reaction 6h at 220 DEG C.Question response terminates and after naturally cooling to room temperature, is taken out by product to carry out centrifugation and after drying.Final products are through being characterized by concave surface Bi
2wO
6nanometer sheet.
Embodiment 6
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 5mL oleyl amine, then continue to stir 30min, put into electric heating constant-temperature blowing drying box by after reactor good seal, isothermal reaction 4h at 220 DEG C.Question response terminates and after naturally cooling to room temperature, is taken out by product to carry out centrifugation and after drying.Final products are through being characterized by concave surface Bi
2wO
6nanometer sheet.
Embodiment 7
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 5mL oleyl amine, then continue to stir 30min, put into electric heating constant-temperature blowing drying box by after reactor good seal, isothermal reaction 10h at 220 DEG C.Question response terminates and after naturally cooling to room temperature, is taken out by product to carry out centrifugation and after drying.Final products are through being characterized by concave surface Bi
2wO
6nanometer sheet.
Comparative example 1
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 2mL oleyl amine, other condition is consistent with embodiment 1.Through characterizing, in product, concave surface Bismuth tungstate nano-sheet ratio is less.
Comparative example 2
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 9mL oleyl amine, other condition is consistent with embodiment 1.Through characterizing, do not have concave surface nanometer sheet to generate, product is micro-crystal.
Comparative example 3
Take 0.5mmoL bismuth nitrate, be dissolved in the ethanol of 15mL, stir and make it dissolve, be labeled as solution A; Separately taking 1mmoL sodium tungstate is dissolved in 20mL water, stirs and makes it dissolve, be labeled as solution B.Then, solution B is added in solution A, and stir 30min under the condition of 25 DEG C.In the polytetrafluoroethylliner liner of autoclave, add above-mentioned mixed solution and 5mL oleyl amine, then continue to stir 30min, put into electric heating constant-temperature blowing drying box by after reactor good seal, isothermal reaction 3h at 220 DEG C.Result concave surface Bismuth tungstate nano-sheet ratio is less.Same operation conditions, the reaction time extends to 11 hours, and the size of concave surface bismuth tungstate sheet will be increased to micron.
Comparative example 4
The bismuth nitrate of 1mmol added in the dust technology of 1M, through the 30min minute ready-made settled solution of stirring at room temperature.Subsequently 25mL is contained the Na of 0.5mmol
2wO
42H
2the oleyl amine of O and 1mL adds above solution.This suspension pH is regulated to be 7 with ammoniacal liquor.Then this solution is placed in the autoclave of inner liner polytetrafluoroethylene inner bag, 200 DEG C of heating 20h.Question response terminates and after naturally cooling to room temperature, is taken out by product and carry out centrifugation, dry, obtains the Bismuth tungstate nano-sheet of flat surface.Fig. 7 is the stereoscan photograph of product.Can find out that this material is the nanometer sheet of flat configuration from ESEM.
Performance test:
Carry out the experiment of electro-catalysis product oxygen to prepare concave surface Bismuth tungstate nano-sheet in embodiment 1, reaction condition is as follows:
The test of chemical property is all carried out, at the Na of 0.5M on the CHI660D electrochemical workstation of Shanghai Chen Hua company
2sO
4do electrode with platinum filament in electrolyte solution, do reference electrode with saturated calomel.Take 5mg concave surface Bi
2wO
6nanometer sheet is scattered in 1mL, and (then V isopropyl alcohol: V water=2: in solution 1), ultrasonic 30min add the naphthols of 40 μ L, continue ultrasonic 30min.Pipette the amount of 5 μ L on the glass-carbon electrode prepared with liquid-transfering gun, after spending the night, measure chemical property.Experimental result is as Fig. 5 and Fig. 6.As shown in Figure 5, when electromotive force is 1.77V, the current density of this material can reach 10mA.cm
-2.Fig. 6 is the polarization curve before and after circulation 500 number of turns.From this figure, through 500 circulations, the electro catalytic activity of this material does not decline substantially.
According to performance test, take 2mg and 9mg concave surface Bi respectively
2wO
6nanometer sheet is scattered in 1mL, and (then V isopropyl alcohol: V water=2: in solution 1), ultrasonic 30min add the naphthols of 40 μ L, continue ultrasonic 30min.Pipette the amount of 5 μ L on the glass-carbon electrode prepared with liquid-transfering gun, after spending the night, measure chemical property.Result of study shows, concave surface Bi
2wO
6the content of nanometer sheet is more than 8mg or lower than 3mg, and after being prepared into electrode, its electro catalytic activity all can weaken.
Concave surface Bismuth tungstate nano-sheet compares with the chemical property of smooth Bismuth tungstate nano-sheet, adopts electrode preparation method similarly to Example 2 and test condition.As shown in Figure 8, the electro catalytic activity of concave surface Bismuth tungstate nano-sheet is better than smooth Bismuth tungstate nano-sheet.
For a person skilled in the art, according to above technical scheme and design, various corresponding change and distortion can be made, and all these change and distortion all should be included within the protection domain of the claims in the present invention.
Claims (10)
1. a preparation method for concave surface Bismuth tungstate nano-sheet eelctro-catalyst, is characterized in that, comprises the steps:
(1) first bismuth nitrate is dissolved in ethanol, stirs and make it dissolve completely, be designated as solution A; Sodium tungstate is soluble in water, stir and make it dissolve completely, be designated as B solution; The mol ratio of bismuth nitrate and sodium tungstate is 4: 1-1: 4;
(2) B solution to be joined in solution A and to stir;
(3) add the oleyl amine of 3-8mL to the mixed solution in step (2), and continue to stir;
(4) in autoclave, add the solution that step (3) finally obtains, drying box is put into after being sealed by autoclave, isothermal reaction 4-10h at 220 DEG C, after reaction terminates, naturally cool to room temperature, after being taken out by product, centrifugation obtains solid concave surface Bismuth tungstate nano-sheet Bi
2wO
6.
2. preparation method according to claim 1, is characterized in that, also comprises step (5): by the solid concave surface Bismuth tungstate nano-sheet Bi obtained in step (4)
2wO
63-8mg is scattered in 1mL aqueous isopropanol, ultrasonic 30min, then adds the naphthols of 40 μ L, continues ultrasonic 30min; Pipette the amount of 5 μ L on the glass-carbon electrode prepared with liquid-transfering gun, spend the night measurement chemical property.
3. preparation method according to claim 1, is characterized in that, in step (1), the mol ratio of bismuth nitrate and sodium tungstate is 1: 2.
4. preparation method according to claim 1, is characterized in that, in step (2), whipping temp is 25 DEG C, and mixing time is 30min.
5. preparation method according to claim 1, is characterized in that, in step (3), oleyl amine addition is 5mL, and mixing time is 30min.
6. preparation method according to claim 1, is characterized in that, in step (4), after putting into drying box, at 220 DEG C, reacts 6h after being sealed by autoclave.
7. preparation method according to claim 1, is characterized in that, in step (4), is lined with polytetrafluoroethylene (PTFE) in the inner bag of autoclave, and drying box is Constant Temp. Oven.
8. preparation method according to claim 2, is characterized in that, in step (5), and solid concave surface Bismuth tungstate nano-sheet Bi
2wO
6addition be 5mg.
9. preparation method according to claim 2, is characterized in that, in step (5), aqueous isopropanol is primarily of isopropyl alcohol and water mixing gained, and wherein the volume ratio of isopropyl alcohol and water is 2: 1.
10. the application of the eelctro-catalyst of preparation method in preparation electrocatalytic decomposition water, fuel cell, lithium-air battery as described in above-mentioned arbitrary claim.
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