CN117089881A - Preparation method of Pt nanoparticle modified bimetallic LDH catalyst and industrial current density electrolyzed water application thereof - Google Patents
Preparation method of Pt nanoparticle modified bimetallic LDH catalyst and industrial current density electrolyzed water application thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000003054 catalyst Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 37
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002131 composite material Substances 0.000 claims abstract description 32
- 239000002086 nanomaterial Substances 0.000 claims abstract description 32
- 238000005406 washing Methods 0.000 claims abstract description 20
- 239000006260 foam Substances 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 17
- 239000002243 precursor Substances 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000011259 mixed solution Substances 0.000 claims abstract description 6
- 238000007605 air drying Methods 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 5
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 4
- 238000001291 vacuum drying Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 238000005868 electrolysis reaction Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 58
- 239000000463 material Substances 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003197 catalytic effect Effects 0.000 description 15
- 235000019441 ethanol Nutrition 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000011056 performance test Methods 0.000 description 7
- 239000012670 alkaline solution Substances 0.000 description 5
- 239000010411 electrocatalyst Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000013112 stability test Methods 0.000 description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 238000006460 hydrolysis reaction Methods 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- 238000010504 bond cleavage reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
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- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 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
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
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- 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
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- 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
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
- C25B11/03—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form perforated or foraminous
- C25B11/031—Porous electrodes
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
Abstract
The invention discloses a preparation method of a Pt nanoparticle modified bimetallic LDH catalyst, which comprises the following steps: sequentially soaking foam nickel in 2-6 mol/L hydrochloric acid, deionized water and ethanol, respectively carrying out ultrasonic treatment in an ultrasonic pool for 10, 6 and 5 minutes, and naturally air-drying for later use; preparing 0.5 to 3 mol/L of uniform goldThe pretreated foam nickel is transferred into a solution, and reacts for a period of time at room temperature; washing the obtained product with water, washing with alcohol, and vacuum drying to obtain a NiFe-LDH precursor; placing a NiFe-LDH precursor into a chloroplatinic acid mixed solution of ethanol and water, wherein the chloroplatinic acid concentration is 0.5-3 mg/ml, and reacting at room temperature overnight; and (3) washing the obtained product in the step with water, washing with alcohol, and then drying in vacuum to obtain the Pt/NiFe-LDH composite nano material. The preparation method is simple, has low requirements on experimental instruments, and has low energy consumption and good repeatability. The catalyst material prepared by the invention has excellent HER activity, and can realize 500 mA cm only by 103 mV and 151 mV overpotential ‑2 And 1000 mA cm ‑2 And stability is superior to commercial Pt/C catalysts.
Description
Technical Field
The invention relates to the field of hydrogen production by water electrolysis, in particular to a preparation method of a Pt nanoparticle modified bimetallic LDH catalyst and an industrial current density water electrolysis application thereof
Background
The problems of the lack of fossil fuel, the deterioration of the ecological environment of the earth and the rapid growth of the population of the world are increasingly serious, and the energy structure transformation is quickened. Hydrogen energy is one of the most competitive green energy sources, and the preparation method is numerous. The technology of hydrogen production by water electrolysis is mature, the preparation process is simple, the purity of hydrogen production is high, and the product is pollution-free, so that the technology is considered as the best choice for producing green hydrogen. At present, the large-scale hydrogen production by utilizing electrolyzed water generates huge energy consumption due to the influence of factors such as electrochemical interfacial resistance, low catalytic activity of the corresponding catalyst and the like. The catalyst can effectively reduce the overpotential required by the reaction of the electrolyzed water and accelerate the reaction process. Therefore, the development and utilization of the catalyst with high efficiency, stability and low cost are beneficial to promoting the industrial process of hydrogen production by water electrolysis.
Pt group metals and their derivatives are currently accepted HER catalysts with optimal performance. Currently, commercial Pt/C catalysts are the dominant source of industrial hydrogen production, but the high cost and scarcity of Pt are the main reasons that limit its widespread use. Reducing Pt content and improving Pt use efficiency are currently common improvement strategies. Pt has the best hydrogen binding energy, but the ho—h bond cleavage efficiency of Pt surface is reduced under alkaline conditions, and HER performance is attenuated. Although various methods such as a hydrothermal method, a chemical vapor deposition method, an electrodeposition method and the like can be used for effectively synthesizing the Pt composite catalyst, the preparation process is complex, the conditions are harsh, the cost of a finished product is increased by introducing additional energy consumption, and the HER activity and the stability of the prepared catalyst are affected to different degrees.
In addition, to achieve practical use of the electrocatalyst, it is necessary to consider that the electrocatalyst is used at high current densities (greater than 500 mA cm -2 ) Surface kinetics of the catalyst and the contact efficiency between the electrolyte solution. In recent years, niFe-LDHs have very high catalytic performance in the electrocatalytic Oxygen Evolution (OER) process, but show very poor HER catalytic activity. Thus, the design and development of a simple, reproducible, low cost HER and OER catalyst capable of long term stable operation at high current densities is still a problem that the skilled artisan needs to overcome.
Disclosure of Invention
One aspect of the invention provides a method for preparing a Pt nanoparticle-modified bimetallic LDH catalyst, comprising the steps of:
firstly, sequentially soaking foam nickel in 2-6 mol/L hydrochloric acid, deionized water and ethanol, respectively carrying out ultrasonic treatment for 10, 6 and 5 minutes in an ultrasonic pool, and naturally air-drying for standby so as to remove oxides and impurities possibly existing on the surface of the foam nickel;
preparing a uniform metal ferric salt aqueous solution with the concentration of 0.5 to 3 mol/L, transferring the pretreated foam nickel into the solution, and reacting for a period of time at room temperature;
step three, washing the obtained product with water, washing with alcohol, and then vacuum drying to obtain a NiFe-LDH precursor;
fourthly, placing the NiFe-LDH precursor into a chloroplatinic acid mixed solution of ethanol and water, wherein the concentration of chloroplatinic acid is 0.5-3 mg/ml, and reacting overnight at room temperature;
and fifthly, washing the obtained product in the step with water, washing with alcohol, and then drying in vacuum to obtain the Pt/NiFe-LDH composite nano material.
Further, the nickel foam is 3 cm ×3 cm to 20 cm ×30 cm.
In another aspect, the invention also provides application of the Pt nanoparticle modified bimetallic LDH catalyst prepared by the method in industrial current density electrolysis of water.
The technical scheme provided by the invention has the following beneficial technical effects: the preparation method is simple, has low requirement on experimental instruments, has low energy consumption and has higher repeatability. The reduction of ethanol in the chloroplatinic acid mixed solution is regulated and controlled by a two-step simple wet chemical method, the reduction and precipitation of Pt in the solution are accelerated, the use efficiency of Pt is improved, the cost is reduced, the catalyst material with excellent catalytic activity is simply and effectively produced, the catalyst material can be suitable for industrial mass production, and the problem that the existing technology is complex and difficult to promote industrial development is solved. The catalyst material prepared by the invention has excellent HER activity, and the current density is 1000 mAcm -2 The required overpotential is much lower than for commercial Pt/C materials. Secondly, the Pt/NiFe-LDH composite nano material is respectively assembled at the cathode and the anode of the alkaline electrolytic cell, and the required overpotential in the full water dissolving process is lower than that of commercial Pt/C and RuO 2 And the performance during stability testing is also superior to commercial catalysts.
Drawings
FIG. 1 is a flow chart of a preparation method of a Pt/NiFe-LDH composite nanomaterial prepared in an embodiment of the invention;
FIG. 2 is an X-ray diffraction (XRD) pattern of the Pt/NiFe-LDH composite nanomaterial prepared in the examples of the present invention;
FIG. 3 is a Scanning Electron Microscope (SEM) image of the Pt/NiFe-LDH composite nanomaterial prepared in the examples of the present invention;
FIG. 4 is a graph showing high-current HER performance test of the Pt/NiFe-LDH composite nanomaterial in alkaline solution prepared in the examples of the present invention (HER performance versus graph of the Pt/NiFe-LDH composite nanomaterial and its comparison);
FIG. 5 is a graph showing the high-current OER performance test of the Pt/NiFe-LDH composite nanomaterial in alkaline solution prepared in the examples of the present invention (OER performance contrast graph of the Pt/NiFe-LDH composite nanomaterial and its comparative sample);
FIG. 6 is a graph showing the performance test of the Pt/NiFe-LDH composite nanomaterial prepared in the example of the present invention in alkaline solution for water decomposition (the Pt/NiFe-LDH composite nanomaterial is assembled as a cathode and an anode to form a full-hydrolysis electrolytic cell and a comparative sample thereof;
FIG. 7 shows the current density of the Pt/NiFe-LDH composite nanomaterial prepared in the embodiment of the invention at 100 mA cm -2 Stability test patterns of (2);
FIG. 8 shows the current density of 100 mA cm for a fully hydrolyzed electrolytic cell assembled from Pt/NiFe-LDH composite nanomaterial as a cathode and an anode prepared in the embodiment of the present invention -2 Stability test patterns of (c).
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be noted that these descriptions are exemplary only and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
As shown in fig. 1, a preparation method of a Pt nanoparticle modified bimetallic LDH catalyst is provided, which includes the following steps:
firstly, sequentially soaking foam nickel in 2-6 mol/L hydrochloric acid, deionized water and ethanol, respectively carrying out ultrasonic treatment for 10, 6 and 5 minutes in an ultrasonic pool, and naturally air-drying for standby so as to remove oxides and impurities possibly existing on the surface of the foam nickel;
preparing a uniform metal ferric salt aqueous solution with the concentration of 0.5 to 3 mol/L, transferring the pretreated foam nickel into the solution, and reacting for a period of time at room temperature;
step three, washing the obtained product with water, washing with alcohol, and then vacuum drying to obtain a NiFe-LDH precursor;
fourthly, placing the NiFe-LDH precursor into a chloroplatinic acid mixed solution of ethanol and water, wherein the concentration of chloroplatinic acid is 0.5-3 mg/ml, and reacting overnight at room temperature;
and fifthly, washing the obtained product in the step with water, washing with alcohol, and then drying in vacuum to obtain the Pt/NiFe-LDH composite nano material.
Preferred nickel foam area sizes are 3 cm ×3 cm to 20 cm ×30 cm.
In another aspect, the invention also provides application of the Pt nanoparticle modified bimetallic LDH catalyst prepared by the method in industrial current density electrolysis of water.
In particular embodiments:
the synthesis method of the Pt/NiFe-LDH composite nanomaterial comprises the following steps:
step one, respectively immersing 3 cm multiplied by 3 cm foam nickel in 3M HCl, absolute ethyl alcohol and deionized water for 10, 6 and 5 minutes respectively, and naturally air-drying for later use.
Step two, preparing 50 ml of 0.5M uniform metal iron salt aqueous solution, transferring the pretreated foam nickel into the solution, and reacting for a period of time at room temperature.
And thirdly, washing the obtained foam nickel with water, washing with alcohol, and then drying in vacuum to obtain the NiFe-LDH precursor.
Step four, the NiFe-LDH precursor is placed in a mixed solution of 10 and ml ethanol-containing chloroplatinic acid, and the mixture is reacted at room temperature overnight.
And fifthly, washing the foam nickel obtained in the step with water, washing with alcohol, and then drying in vacuum to obtain the Pt/NiFe-LDH composite nano material.
FIG. 2 is an X-ray diffraction (XRD) characterization of the Pt/NiFe LDH composite nanomaterial from which a diffraction peak with Pt is evident, confirming successful compositing of Pt with NiFe-LDH using the method described above. The morphology of the Pt/NiFe-LDH composite nanomaterial is characterized by using a Scanning Electron Microscope (SEM), and the result is shown in figure 3, so that the distribution condition of Pt particles on a three-dimensional network structure formed by a two-dimensional nano array can be clearly observed.
The prepared catalyst was tested for HER catalytic activity using a three electrode system:
specifically, the prepared Pt/NiFe LDH composite nanomaterial (1 cm multiplied by 1 cm) is used as a working electrode, an Hg/HgO electrode and a carbon rod are respectively used as a reference electrode and a counter electrode, and 1M KOH is used as electrolyte, so that HER catalytic performance under the condition of high current is tested.
FIG. 4 is a Pt/NiFe-LDH compositeHER performance test of nanomaterials and their comparison in alkaline solution. Fig. 4 a is a Linear Sweep Voltammetric (LSV) curve from which it can be seen that the Pt/NiFe-LDH composite nanomaterial prepared with the examples as HER catalyst, which has the lowest overpotential at the same current density, shows the best HER catalytic activity. FIG. 4 b shows the overpotential of Pt/NiFe-LDH composite nanomaterial and its control at different current densities. Compared with other comparison samples, the Pt/NiFe-LDH composite nano material used as an electrocatalyst for realizing the same current density needs the lowest overpotential, and 100 mA cm can be realized only by 62 mV overpotential -2 Current density. When the current density is continuously increased, the advantage of the Pt/NiFe-LDH composite nano material is more obvious, and only 103 mV and 151 mV overpotential is needed to realize 500 mA cm -2 And 1000 mA cm -2 Is a high current density of (a). Compared with a commercial Pt/C electrode, the Pt/NiFe-LDH composite nano material has the advantages that the Pt/NiFe-LDH composite nano material is 500 mA cm -2 And 1000 mA cm -2 The performance of the catalyst is improved by 1.84 times and 1.85 times respectively under the condition of high current density, and the catalyst shows excellent HER catalytic activity. In addition, as shown in FIG. 7, the Pt/NiFe-LDH composite nanomaterial was at 100 mA cm -2 Can continue to operate stably for more than 200 h at a current density. The above characterization demonstrates that the introduction of Pt greatly enhances HER catalytic activity of NiFe-LDH. Therefore, the catalytic electrode material with excellent performance can be prepared by the simple wet chemical strategy reported by the invention without additionally increasing energy consumption, and a new view is provided for the development of a catalytic material system for preparing hydrogen by electrolysis of water in industrial scale and low energy consumption.
OER catalytic activity of the prepared catalyst was tested using a three electrode system:
similar to HER performance test, the prepared Pt/NiFe LDH (1 cm ×1 cm), hg/HgO and carbon rod were used as working electrode, reference electrode and counter electrode, respectively, and 1M KOH was used as electrolyte, thereby testing OER catalytic performance under high current conditions.
FIG. 5 shows OER performance test of Pt/NiFe-LDH and its comparison sample in alkaline solution, from which it is seen that the OER activity of the Pt/NiFe-LDH composite nanomaterial is slightly attenuated compared with that of the precursor NiFe-LDH, which requires an overpotential of 356 mV to achieve 500 mA cm -2 But still better than commercial RuO 2 A catalyst.
Full water splitting performance test:
the Pt/NiFe-LDH composite nanomaterial prepared by the embodiment has good alkaline HER and OER catalytic performance under high current density, so that the material can be used as a bifunctional electrocatalyst for full electrolysis of water. The Pt/NiFe-LDH catalyst was used as the cathode and anode respectively to assemble a full hydrolysis cell, which requires only a voltage of 1.49V to drive 10 mA cm as shown in FIG. 6 -2 Is better than the current density of the commercial Pt/C and RuO 2 An alkaline electrolytic cell for fully decomposing water by respectively serving as a cathode and an anode. In addition, FIG. 8 shows that the Pt/NiFe-LDH composite nanomaterial as a dual-function electrocatalyst has a current density of 100 mAcm in an alkaline cell -2 Under the stability test condition, good catalytic activity is still maintained in the stability test of more than 200 and h.
It should be noted that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way to be construed as limiting of the present invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (3)
1. The preparation method of the Pt nanoparticle modified bimetallic LDH catalyst is characterized by comprising the following steps of:
firstly, sequentially soaking foam nickel in 2-6 mol/L hydrochloric acid, deionized water and ethanol, respectively carrying out ultrasonic treatment for 10, 6 and 5 minutes in an ultrasonic pool, and naturally air-drying for later use;
preparing a uniform metal ferric salt aqueous solution with the concentration of 0.5 to 3 mol/L, transferring the pretreated foam nickel into the solution, and reacting at room temperature for 5 to 10 h;
step three, washing the obtained product with water, washing with alcohol, and then vacuum drying to obtain a NiFe-LDH precursor;
fourthly, placing the NiFe-LDH precursor into a chloroplatinic acid mixed solution of ethanol and water, wherein the concentration of chloroplatinic acid is 0.5-3 mg/ml, and reacting at room temperature for 10-14 h;
and fifthly, washing the obtained product in the step with water, washing with alcohol, and then drying in vacuum to obtain the Pt/NiFe-LDH composite nano material.
2. A method of preparing a Pt nanoparticle modified bimetallic LDH catalyst as claimed in claim 1, wherein the nickel foam is from 3 cm x 3 cm to 20 cm x 30 cm.
3. A Pt nanoparticle-modified bimetallic LDH catalyst prepared according to the method of claim 1 for industrial current density electrolysis of water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310999575.8A CN117089881A (en) | 2023-08-09 | 2023-08-09 | Preparation method of Pt nanoparticle modified bimetallic LDH catalyst and industrial current density electrolyzed water application thereof |
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| CN202310999575.8A CN117089881A (en) | 2023-08-09 | 2023-08-09 | Preparation method of Pt nanoparticle modified bimetallic LDH catalyst and industrial current density electrolyzed water application thereof |
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| CN115770621A (en) * | 2022-11-23 | 2023-03-10 | 云南大学 | Preparation method and application of bimetallic MOF (metal organic framework) anchored Pt nanocluster catalyst |
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| CN115770621A (en) * | 2022-11-23 | 2023-03-10 | 云南大学 | Preparation method and application of bimetallic MOF (metal organic framework) anchored Pt nanocluster catalyst |
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