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Preparation method and application of NiFe-LDH composite material

A composite material, ni-bdc technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve problems such as high cost and development constraints

Inactive Publication Date: 2021-02-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their development has been limited due to their severe shortage and high cost

Method used

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  • Preparation method and application of NiFe-LDH composite material
  • Preparation method and application of NiFe-LDH composite material
  • Preparation method and application of NiFe-LDH composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add BDC (0.75 mmol) to a mixture of 32 mL DMF, 2 mL ethanol and 2 mL water, ultrasonically disperse for 1 h, and then add 90 mg NiCl 2 ·6H 2 O. NiCl 2 ·6H 2 After O was completely dissolved, 0.8 mL of TEA was quickly added to the above solution. Then the solution was magnetically stirred for 1 h, and then ultrasonically continued for 8 h. Finally, the final product was collected by centrifugation, washed repeatedly with ethanol and DMF, and dried at 60°C for 5 hours to obtain the Ni-BDC precursor;

[0027] (2) Add Ni-BDC (20 mg) into 40 mL deionized water and sonicate for 2 h, then add iron nitrate Fe 2 (NO 3 ) 3 9H 2 O, (20 mg) and ammonium fluoride (NH 4 F, 1.48 mg) was slowly added to the above solution, and stirred to form a relatively dispersed suspension. NaOH (1 mol / L) and NCO 3 (1 mol / L) mixed at a volume ratio of 1:1 to obtain NaOH / NaCO 3 Buffer, NaOH / NaCO 3 Buffer was added dropwise to the suspension until pH=10. Finally, the solution was tra...

Embodiment 2

[0030] (1) Same as embodiment 1;

[0031] (2) Ni-BDC (20 mg) was sonicated in 40 mL deionized water for 2 h. Then iron nitrate Fe 2 (NO 3 )3 9H 2 O, (40mg) and ammonium fluoride (NH 4 F, 1.48 mg) was slowly added to the above solution, and stirred to form a relatively dispersed suspension. NaOH (1mol / L) and NCO 3 (1 mol / L) mixed at a volume ratio of 1:1 to obtain NaOH / NaCO 3 Buffer, NaOH / NaCO 3 Buffer was added dropwise to the suspension until pH=10. Finally, the solution was transferred to a 100 mL stainless steel autoclave lined with Teflon, heated at 140 °C for 12 h, and then allowed to stand to room temperature. The final solid product was collected by centrifugation and washed repeatedly with water and ethanol. Denote the product as NiFe-LDH-A2;

[0032] (3) Electrochemical performance test of NiFe-LDH-A2: at a current density of 10 mA / cm 2 , the overpotential of NiFe-LDH-A2 is 264 mV, Tafel is 57 mV dec -1 .

Embodiment 3

[0034] (1) Same as embodiment 1;

[0035] (2) Ni-BDC (20 mg) was sonicated in 40 mL deionized water for 2 h. Then ferric nitrate (Fe 2 (NO 3 ) 3 9H 2 O, 60mg) and ammonium fluoride (NH 4 F, 1.48 mg) was slowly added to the above solution, and stirred to form a relatively dispersed suspension. NaOH (1mol / L) and NCO 3 (1 mol / L) mixed at a volume ratio of 1:1 to obtain NaOH / NaCO 3 Buffer, NaOH / NaCO 3 Buffer was added dropwise to the suspension until pH=10. Finally, the solution was transferred to a 100 mL stainless steel autoclave lined with Teflon, heated at 140 °C for 12 h, and then allowed to stand to room temperature. The final solid product was collected by centrifugation and washed repeatedly with water and ethanol. Denote the product as NiFe-LDH-A3;

[0036] (3) Electrochemical performance test of NiFe-LDH-A3: at a current density of 10 mA / cm 2 , the overpotential of NiFe-LDH-A3 is 290 mV, Tafel is 55 mV dec -1 .

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Abstract

The invention provides a preparation method of a NiFe-LDH composite material, which comprises the following steps: dissolving 1, 4-terephthalic acid and NiCl2. 6H2O in a mixed solution of DMF, ethanoland water, adding triethanolamine, stirring at room temperature, carrying out ultrasonic treatment, centrifuging, washing, drying to obtain a Ni-BDC precursor, dispersing a Ni-BDC precursor, ferric nitrate and ammonium fluoride in deionized water, adding a NaOH / NaCO3 buffer solution to adjust the pH value to 9-10, carrying out a hydrothermal reaction at 135-145 DEG C for 10-12 h, centrifuging, and washing to finally obtain the solid product NiFe-LDH composite material. Ni-BDC is introduced as a self-sacrificing template, ferric nitrate and ammonium fluoride are added, hydroxide and carbonateare introduced, and NiFe-LDH is synthesized in a one-step hydrothermal mode. The synthesized NiFe-LDH has an MOF framework, and the MOF framework provides a rich chemical surface area and expands an electron transmission channel. The LDH nanosheet ultrathin array rich in metal active sites has an active space, and the electronic structure can be further adjusted, so that the NiFe-LDH has excellentOER catalyst activity when being used as an electrocatalyst for a water electrolysis oxygen evolution reaction.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of catalysts, and in particular relates to a method for preparing a NiFe-LDH composite material. The NiFe-LDH composite material is mainly used as an electrocatalyst in the oxygen evolution reaction of electrolyzed water. Background technique [0002] With the rapid decline of fossil fuel resources, the need for environmentally friendly and renewable energy has become urgent. Electrocatalytic water splitting is considered to be the most reliable method for large-scale production of hydrogen energy for renewable energy. However, the anodic oxygen evolution reaction (OER) in water electrolysis is a four-electron coupled proton process that requires high energy to overcome the barriers of reaction kinetics. In order to improve the high kinetic energy barrier in the OER process, it is particularly important to synthesize efficient OER electrocatalysts. Currently, noble metal cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/075C25B11/052C25B1/04
CPCC25B1/04Y02E60/36
Inventor 莫尊理刘文通王晓倩董奇兵刘桂桂王嘉郭旭东陈颖郭瑞斌刘妮娟
Owner NORTHWEST NORMAL UNIVERSITY
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