CN114804307A - KC pre-intercalated carbon nano sheet (KC-PCN), preparation method, electrode and capacitive deionization - Google Patents
KC pre-intercalated carbon nano sheet (KC-PCN), preparation method, electrode and capacitive deionization Download PDFInfo
- Publication number
- CN114804307A CN114804307A CN202210218843.3A CN202210218843A CN114804307A CN 114804307 A CN114804307 A CN 114804307A CN 202210218843 A CN202210218843 A CN 202210218843A CN 114804307 A CN114804307 A CN 114804307A
- Authority
- CN
- China
- Prior art keywords
- pcn
- carbon nano
- preparing
- intercalated carbon
- intercalation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 47
- 238000002242 deionisation method Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims description 13
- 239000002135 nanosheet Substances 0.000 title abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 22
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 12
- 238000010612 desalination reaction Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 239000013535 sea water Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims abstract description 6
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 6
- 239000012467 final product Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000002064 nanoplatelet Substances 0.000 claims description 9
- 239000002243 precursor Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000007772 electrode material Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000002060 nanoflake Substances 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 239000011149 active material Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000013505 freshwater Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 238000009830 intercalation Methods 0.000 abstract description 36
- 230000002687 intercalation Effects 0.000 abstract description 35
- 230000007246 mechanism Effects 0.000 abstract description 26
- 150000003839 salts Chemical class 0.000 abstract description 19
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 abstract description 10
- 238000003860 storage Methods 0.000 abstract description 7
- 239000000243 solution Substances 0.000 abstract description 6
- 239000012267 brine Substances 0.000 abstract description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- 239000000047 product Substances 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 14
- 238000001179 sorption measurement Methods 0.000 description 9
- 239000011229 interlayer Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011033 desalting Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000002055 nanoplate Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000002228 NASICON Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229960003351 prussian blue Drugs 0.000 description 1
- 239000013225 prussian blue Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Materials Engineering (AREA)
- Molecular Biology (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The invention belongs to the field of capacitive deionization, and relates to a method for applying a KC pre-intercalated carbon nano sheet (KC-PCN) to a novel dynamic intercalation mechanism, so that the salt removal capacity (SAC) is effectively improved, and the ultrahigh cycle life is obtained. The method comprises adding Maleic Anhydride (MAH) and potassium hydroxide (KOH) into a mortar at room temperature, grinding for 5 min, transferring into a tube furnace, and grinding in N 2 Heating to 700 deg.C under atmosphere o And C, calcining for 30 minutes, washing the product with 1 mol/L hydrochloric acid solution and deionized water to reach the pH =7, and drying for 12 hours to obtain the final product. The invention firstly provides a dynamic intercalation sodium storage mechanism and applies the mechanism to the field of capacitive deionization. The dynamic intercalation mechanism initiated by the conjugated carbonyl group achieves the ultrahigh SAC (40.72 mg g) in the carbon-based capacitive deionization ‑1 ) And still remained 97.9 after 300 cycles6% salt removal capacity. In addition, KC-PCN can reach 1.65 g g in the application of simulating seawater ‑1 The ultra-high performance of (2). The method is simple to operate and environment-friendly, and provides a novel reference mechanism for industrial high-concentration brine desalination.
Description
Technical Field
The invention belongs to the field of super-capacitor deionization, and particularly relates to a KC pre-intercalated carbon nano sheet (KC-PCN), a preparation method, an electrode and capacitor deionization.
Background
The Capacitive Deionization (CDI) is an electrochemical seawater desalination process based on the principle of Electric Double Layer (EDL) ion adsorption on the surface of an electrode, and has low energy consumption<0.3kwh/m 3 ) High water recovery rate (>90%), and the like, and is a novel seawater desalination technology which is concerned in recent years. At present, carbon-based CDI is inevitably affected by surface corrosion during operation, resulting in performance loss. For this reason, a correspondingly effective way to avoid this problem is to perform electrode composition modification. This strategy is considered a promising approach to stabilize carbon-based CDI, but the difficulty of increasing ion removal capacity has not been solved.
To achieve satisfactory seawater desalination capacity using a CDI electrochemical system, innovative seawater desalination plants, such as flow electrode capacitive deionization (FCDI), Hybrid Capacitive Deionization (HCDI), Membrane Capacitive Desalination (MCDI), and seawater desalination cells, also consider desalination rate, working salt concentration, and energy consumption. Further, with the advent of these devices, possible candidate electrodes include metal sulfides, NASICON, prussian blue, and the like. The primary storage mechanism of faraday electrodes, compared to conventional EDL-based electrodes, is ion intercalation or phase inversion within the applied electrode material, resulting in higher energy density and higher salt desorption capacity than physical charge adsorption processes. The resulting volume expansion may prevent their widespread future use. Based on the long-term stability of EDL electrodes and the large ion removal capability of faraday electrodes, it is possible to combine their advantages, for example, combining carbon-based electrode auxiliary materials with an intercalation charge storage mechanism rather than simple physical charge adsorption. Thus, the main parameters that contribute to storage kinetics are local electronic structure, morphology, dimensions and interlayer spacing. To date, focus has been primarily on simple intercalation mechanisms. Therefore, how to reasonably control the crystalline graphitized structure and disordered microcrystalline nano-domains of carbon is the key to comprehensively optimize the CDI performance. In summary, the development of new intercalation materials is a straightforward and effective strategy to increase the salt removal capacity. Meanwhile, the method can be further improved.
Through the above analysis, the problems and defects of the prior art are as follows: the existing carbon-based capacitive deionization salt adsorption mechanism EDL has small desalting performance, and the volume expansion of the existing intercalation material causes irreversible influence on the cycle life.
The difficulty in solving the above problems and defects is: in capacitive deionization, EDL and intercalation mechanisms can limit the salt removal capacity and the cycle stability of capacitive deionization to different degrees, and existing strategies all have certain technical difficulties. In addition, how to develop new energy storage mechanisms is another difficulty.
The significance of solving the problems and the defects is as follows: by pre-intercalating the carbon nano-sheets, a novel dynamic intercalation mechanism is developed, ultra-high salt removal capacity and ultra-high cycle life are obtained, and a novel reference mechanism can be provided for industrial high-concentration brine desalination.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a KC pre-intercalated carbon nano sheet (KC-PCN), a preparation method, an electrode and capacitive deionization
The invention is realized in such a way that a preparation method of a KC pre-intercalated carbon nano thin sheet (KC-PCN) comprises the following steps:
preparing a precursor: maleic Anhydride (MAH) and potassium hydroxide (KOH) were mixed at room temperature in a ratio of 1:1, adding the mixture into a mortar, and grinding for 5 min;
transfer precursor to tube furnace in N 2 Heating to 700 deg.C under atmosphere o C, heat preservation and calcination are carried out for 30 min;
washing the obtained black powder with 1 mol/L hydrochloric acid solution and deionized water until the pH value is 7, and drying in an oven for 12 h to obtain a final product.
Adopts a one-step smelting strategy to synthesize the KC pre-intercalated carbon nanosheet with a unique layered structure. Initially, carbonization in the absence of KOH in MAH resulted in a cured structure. In this work, we propose a scalable strategy to design KC pre-intercalated carbon nanoplates with desirable yields (78%) by alkali metal-assisted melting, with intercalationThe KC agent is formed in situ and pre-inserted into the carbon nano-sheet, and generates a large amount of conjugated carbonyl structures. The formation of a unique layered structure is mainly caused by a three-step mechanism: ion diffusion → ionic bond pull → recovery of pull. Provides precondition for subsequent dynamic intercalation mechanism, thereby generating higher intercalation energy and realizing Na + The dynamic intercalation mechanism obtains ultrahigh salt removal capacity and excellent cycle stability.
Further, preparation of the precursor: maleic Anhydride (MAH) and potassium hydroxide (KOH) were mixed at room temperature in a ratio of 1: adding into a mortar at a molar ratio of 1, and grinding for 5 min.
Further, the precursor was transferred to a tube furnace in N 2 Heating to 700 deg.C under atmosphere o And C, keeping the temperature and calcining for 30 min.
And further, washing the obtained black powder with hydrochloric acid solution and deionized water until the pH value is 7, and drying in an oven for 12 hours to obtain a final product.
Another object of the present invention is to provide KC pre-intercalated carbon nanoflakes (KC-PCN)
Another object of the present invention is to provide an electrode prepared by the above method, wherein the active material of the electrode is 30 mg, polyvinylidene fluoride (PVDF), acetylene black is mixed in a ratio of 8: 1:1 into ethanol to prepare homogenate, and evenly smearing the homogenate on graphite paper (5 cm multiplied by 6 cm) with 120 percent o And C, drying overnight.
It is another object of the present invention to provide a capacitive deionization apparatus using the electrode.
Another objective of the present invention is to provide a dynamic intercalation mechanism of the capacitive deionization device.
By combining all the technical schemes, the invention has the advantages and positive effects that: the carbon-based (EDL) capacitor deionization salt has small adsorption performance and the volume expansion of the intercalation material causes irreversible influence on the cycle life, the carbon nano sheet with enough interlayer spacing is synthesized by selecting a pre-intercalation strategy, and the unique layered structure and the intercalation energy and the adsorption energy generated by the formed conjugated carbonyl are utilized to improve the salt removal capacity and the cycle lifeThe ring stability, the dynamic intercalation mechanism shown by the prepared KC-PCN, achieves ultrahigh salt removal capacity and excellent cycle stability. And the performance in brine also reaches 1.65 g g -1 Ultra high level of (a).
The invention designs KC pre-intercalation carbon nano-sheets (KC-PCN) with rich conjugated carbonyl groups as novel intercalation electrodes in symmetric capacitance deionization for the first time through a one-step smelting method; the electrode has a unique pre-intercalation layered structure and sufficient interlayer spacing, and provides a large number of active sites for intercalation of electrolyte cations. And a large amount of conjugated carbonyl groups are generated in engineering, so that a premise is provided for a dynamic intercalation mechanism; the prepared KC-PCN can achieve ultrahigh salt removal capacity and excellent cycle stability when used as a capacitive deionization electrode material; the preparation method has the characteristic of simple and convenient operation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) according to an embodiment of the present invention.
FIG. 2 is a flow chart of an implementation of a method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) according to an embodiment of the present invention.
Figure 3 is an X-ray diffraction pattern of a material prepared as provided by an embodiment of the present invention.
FIG. 4 is a scanning electron micrograph of a prepared material provided in an embodiment of the present invention
FIG. 5 is a transmission electron micrograph of a prepared material provided by an embodiment of the present invention.
Fig. 6 is a schematic mechanism diagram of a structure provided by an embodiment of the present invention.
FIG. 7 is a graph of salt removal capacity and salt adsorption rate Region and cycle chart for performance characterization provided by an example of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Aiming at the problems in the prior art, the invention provides a KC pre-intercalated carbon nano sheet (KC-PCN), a preparation method, an electrode and capacitance deionization, and the invention is described in detail below by combining the attached drawings.
As shown in FIG. 1, the preparation method of KC pre-intercalated carbon nano-sheets (KC-PCN) provided by the invention comprises the following steps:
s101: adding Maleic Anhydride (MAH) and potassium hydroxide (KOH) into a mortar at a molar ratio of 1:1 at room temperature, and grinding for 5 min;
s102: transfer precursor to tube furnace to 2 o C min -1 At a rate of N 2 Heating to 700 deg.C under atmosphere o And C, keeping the temperature and calcining for 30 min. (ii) a
S103: washing the obtained black powder with 1 mol/L hydrochloric acid solution and deionized water until the pH value is 7, and drying in an oven for 12 h to obtain a final product;
FIG. 1 is a schematic diagram showing a method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) according to the present invention.
The invention takes 30 mg of active substance, polyvinylidene fluoride (PVDF), acetylene black as raw materials, and the weight ratio of the active substance to the raw materials is 8: 1: dispersing the mixture in ethanol at a mass ratio of 1 to prepare homogenate, and uniformly coating the homogenate on graphite paper (5 cm multiplied by 6 cm) at a mass ratio of 120 o C, drying the mixture overnight; a CDI device is assembled by using an electrode material, NaCl is used as electrolyte, and the Capacitive Deionization (CDI) performance of the electrode material is tested.
The invention provides a pre-intercalation strategy for preparing a KC pre-intercalated carbon nano sheet (KC-PCN); the KC-PCN prepared by the method has a unique layered structure of KC-supported nano-flakes and has high contentIntercalation energy, the formed conjugated carbonyl has high adsorption energy and can induce Na + Carrying out dynamic intercalation; the prepared KC-PCN reaches the maximum salt removal capacity of Capacitive Deionization (CDI) at present, has ultrahigh performance in high-concentration brine and simultaneously has higher circulation stability; simple operation and easy batch preparation.
The KC-PCN material prepared by the invention is shown by XRD to have a lattice structure corresponding to KC, and shows different lattice structures and different layer spacings at different molar ratios; it was used for capacitive deionization at 1.2V for 20 ml min -1 ，500 mg L -1 Under the operating conditions of (1), an ultra-high SAC (40.72 mg g) was obtained -1 ) (ii) a The scanning electron microscope characterization shows that KC-PCN well retains the nanosheet structure of maleic anhydride. Under the induction of KOH, KC-PCN bulk particles continuously aggregate and delaminate, producing a two-dimensional flexible nanosheet structure with a small thickness of about 10.80 nm, thereby producing a structure that facilitates ion transport. Transmission electron microscopy further confirmed the pronounced nanoplate morphology with rugosities, which clearly shows short-range disorder and long-range order of the layer structure, which closely matches the (113) and (002) faces of KC and carbon nanoplates. The above results indicate that KC was successfully inserted into the engineered carbon layer. The method can be suitable for the preparation of various pre-intercalated carbon nanosheet materials.
The invention is further described below with reference to experimental data and results.
FIG. 2 is a flow chart of an implementation of a method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) according to an embodiment of the present invention.
Figure 3 is an X-ray diffraction pattern of a material prepared as provided by an embodiment of the present invention.
FIG. 4 is a scanning electron micrograph of a prepared material provided in an embodiment of the present invention
FIG. 5 is a transmission electron micrograph of a prepared material provided by an embodiment of the present invention.
Fig. 6 is a schematic mechanism diagram of a structure provided by an embodiment of the present invention.
FIG. 7 is a graph of salt removal capacity and salt adsorption rate Region and cycle chart for performance characterization provided by an example of the present invention. Experiments show that:
in view of the poor long-term stability and limited desalting capability of the carbon-based electrode, an optimized charge storage mechanism for improving the desalting performance is still necessary, the invention provides a dynamic intercalation mechanism to overcome the limitation, and KC pre-intercalation carbon nanosheets (KC-PCN) with rich conjugated carbonyl groups are designed by a one-step smelting method to be used as novel intercalation electrodes in symmetric capacitance deionization. The ultra-high SAC value of 40.72 mg g of the carbon material in the capacitive deionization is achieved -1 And still has a retention of 97.96% after 300 cycles.
According to the existing charge storage mechanism of capacitive deionization, the invention selects the carbon nano sheet material of the pre-intercalation as an electrode, and utilizes sufficient interlayer spacing to increase Na + The storage and the simultaneous synthesis of a large number of generated conjugated carbonyl groups provide a premise for the generation of a dynamic intercalation mechanism, and the prepared KC-PCN material has excellent overall performance which is ranked in the front in all symmetrical CDI systems reported in the literature at present.
The invention designs KC pre-intercalation carbon nano-sheets (KC-PCN) with rich conjugated carbonyl groups as novel intercalation electrodes in symmetric capacitance deionization for the first time through a one-step smelting method; the electrode has a unique pre-intercalation layered structure and sufficient interlayer spacing, and provides a large number of active sites for intercalation of electrolyte cations. And a large amount of conjugated carbonyl produced by engineering provides a premise for obtaining a dynamic intercalation mechanism; the prepared KC-PCN can achieve ultrahigh salt removal capacity and excellent cycle stability when used as a capacitive deionization electrode material; the preparation method has the characteristic of simple and convenient operation.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method for preparing a KC pre-intercalated carbon nano flake (KC-PCN), the method comprising:
preparing a precursor: adding Maleic Anhydride (MAH) and potassium hydroxide (KOH) into a mortar at room temperature, and grinding for 5 min;
transfer precursor to tube furnace to 2 o C min -1 At a rate of N 2 Heating to 700 deg.C under atmosphere o C, heat preservation and calcination are carried out for 30 min;
washing the obtained black powder with 1 mol/L hydrochloric acid solution and deionized water until the pH value is 7, and drying in an oven for 12 h to obtain a final product.
2. The method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) according to claim 1, wherein the preparation of the precursor: maleic Anhydride (MAH) and potassium hydroxide (KOH) were mixed at room temperature in a ratio of 1:1 into a mortar, and grinding for 5 min.
3. The method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) according to claim 1, wherein the precursor is transferred to a tube furnace to 2 o C min -1 At a rate of N 2 Heating to 700 deg.C under atmosphere o And C, performing heat preservation and calcination for 30 min to obtain black powder.
4. The method for preparing KC pre-intercalated carbon nano-platelets (KC-PCN) as defined in claim 1, wherein the obtained black powder is washed with 1 mol/L hydrochloric acid solution and deionized water to pH 7, and dried for 12 h to obtain the final product.
5. A KC pre-intercalated carbon nano-platelet (KC-PCN) prepared by the method for preparing the KC pre-intercalated carbon nano-platelet (KC-PCN) as defined in any one of claims 1 to 4.
6. An electrode prepared from the KC pre-intercalated carbon nano-flake (KC-PCN) of any one of claims 1 to 4 by the method of preparing the electrode by mixing 30 mg of active material, acetylene black and polyvinylidene fluoride (PVDF) in a ratio of 8: 1:1 quality ofDispersing in ethanol to obtain homogenate, and uniformly coating the homogenate on graphite paper (5 cm × 6 cm) 120 o And C, drying overnight.
7. A capacitive deionization unit assembled from the electrode material as claimed in claim 6.
8. A solar energy system incorporating capacitive deionization as claimed in claim 7.
9. An installation for producing fresh water by industrial desalination of sea water according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210218843.3A CN114804307B (en) | 2022-03-08 | 2022-03-08 | KC pre-intercalated carbon nano-sheet (KC-PCN), preparation method, electrode and capacitive deionization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210218843.3A CN114804307B (en) | 2022-03-08 | 2022-03-08 | KC pre-intercalated carbon nano-sheet (KC-PCN), preparation method, electrode and capacitive deionization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114804307A true CN114804307A (en) | 2022-07-29 |
| CN114804307B CN114804307B (en) | 2023-05-23 |
Family
ID=82529002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210218843.3A Active CN114804307B (en) | 2022-03-08 | 2022-03-08 | KC pre-intercalated carbon nano-sheet (KC-PCN), preparation method, electrode and capacitive deionization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114804307B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030099872A1 (en) * | 1999-02-26 | 2003-05-29 | Muguo Chen | Solid gel membrane |
| US20040071622A1 (en) * | 2002-10-15 | 2004-04-15 | Jiang-Jen Lin | Exfoliative clay and derivative thereof and method for producing the same |
| CN108470906A (en) * | 2018-03-02 | 2018-08-31 | 河南师范大学 | The method for preparing high-performance sodium-ion battery positive material using double template |
| CN110429267A (en) * | 2019-08-19 | 2019-11-08 | 河南师范大学 | The method for preparing nanoscale flake sodium-ion battery positive material using multi-template agent |
| CN111793155A (en) * | 2019-04-08 | 2020-10-20 | 中国石油化工股份有限公司 | Antibacterial high polymer material and preparation method and application thereof |
| CN112956052A (en) * | 2018-09-06 | 2021-06-11 | 新罗纳米技术有限公司 | Electrode with conductive intermediate layer and method thereof |
-
2022
- 2022-03-08 CN CN202210218843.3A patent/CN114804307B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030099872A1 (en) * | 1999-02-26 | 2003-05-29 | Muguo Chen | Solid gel membrane |
| US20040071622A1 (en) * | 2002-10-15 | 2004-04-15 | Jiang-Jen Lin | Exfoliative clay and derivative thereof and method for producing the same |
| CN108470906A (en) * | 2018-03-02 | 2018-08-31 | 河南师范大学 | The method for preparing high-performance sodium-ion battery positive material using double template |
| CN112956052A (en) * | 2018-09-06 | 2021-06-11 | 新罗纳米技术有限公司 | Electrode with conductive intermediate layer and method thereof |
| CN111793155A (en) * | 2019-04-08 | 2020-10-20 | 中国石油化工股份有限公司 | Antibacterial high polymer material and preparation method and application thereof |
| CN110429267A (en) * | 2019-08-19 | 2019-11-08 | 河南师范大学 | The method for preparing nanoscale flake sodium-ion battery positive material using multi-template agent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114804307B (en) | 2023-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu et al. | High-performance α-Fe2O3/C composite anodes for lithium-ion batteries synthesized by hydrothermal carbonization glucose method used pickled iron oxide red as raw material | |
| Li et al. | LDHs derived nanoparticle-stacked metal nitride as interlayer for long-life lithium sulfur batteries | |
| Xiong et al. | Oxygen-containing functional groups enhancing electrochemical performance of porous reduced graphene oxide cathode in lithium ion batteries | |
| Zhang et al. | A comprehensive green utilization strategy of lignocellulose from rice husk for the fabrication of high-rate electrochemical zinc ion capacitors | |
| CN110120504A (en) | A kind of phosphorus/tin/carbon compound cathode materials preparation method of richness phosphorus | |
| CN109279583B (en) | Molybdenum diselenide/nitrogen-doped carbon composite nano material and preparation method and application thereof | |
| CN108428882B (en) | Zinc silicate/carbon micro-nano hierarchical structure compound and preparation method thereof | |
| CN108242544B (en) | Biomass activated carbon-based carbon material, preparation method thereof and application thereof in sodium-ion battery | |
| CN105514425B (en) | A kind of high-performance room-temperature sodium-ion battery and preparation method thereof | |
| CN115084489A (en) | Preparation method and application of ultrasonic-assisted intercalation vanadium-based oxide composite material | |
| Yang et al. | Upcycling of spent carbon cathode (SCC) into SCC-2600@ rGO facilitates ultrastable and fast lithium storage | |
| CN111525123A (en) | Cathode material of water-based lithium ion battery and preparation method and application thereof | |
| Jiang et al. | Excimer ultraviolet-irradiated graphene separator for suppressing polysulfide shuttling in Li–S batteries | |
| Liao et al. | Multi-channel rod structure hard carbon for high initial Coulombic efficiency and low-potential sodium storage | |
| Yong et al. | Walnut shell-derived porous carbon with MgSO4 modification for high-performance capacitive deionization | |
| CN117383540A (en) | Preparation method of high-magnification modified biomass hard carbon material | |
| CN109301252B (en) | Preparation method of chelating agent surface modified porous carbon material | |
| CN114804307B (en) | KC pre-intercalated carbon nano-sheet (KC-PCN), preparation method, electrode and capacitive deionization | |
| Geng et al. | Pore structure engineering in carbon microsphere for fast potassium/lithium storage | |
| Liu et al. | Design of reduced graphene oxide coating carbon sub-microspheres hierarchical nanostructure for ultra-stable potassium storage performance | |
| CN115472797A (en) | Porous carbon supported interlamellar spacing expansion molybdenum disulfide compound and preparation method and application thereof | |
| Liu et al. | Regulation of V2O5 layer spacing by controlling H2O/C2H5OH ratio in hydrothermal process for application in electrochemical conversion of salinity gradient energy | |
| CN112794360B (en) | Preparation of nano SnO 2 Method for preparing/GC composite anode material | |
| CN109786728B (en) | NbOPO4 nanosheet/rGO composite material and preparation method and application thereof | |
| Shi et al. | Acid-base encapsulation prepared N/P co-doped carbon-coated natural graphite for high-performance lithium-ion batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240415 Address after: 518000 1002, Building A, Zhiyun Industrial Park, No. 13, Huaxing Road, Henglang Community, Longhua District, Shenzhen, Guangdong Province Patentee after: Shenzhen Wanzhida Technology Co.,Ltd. Country or region after: China Address before: 273165 Jingxuan West Road, Qufu City, Jining, Shandong Province, No. 57 Patentee before: QUFU NORMAL University Country or region before: China |