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A monolithic porous dual-effect non-noble metal catalyst for water full-electrolysis and a synthetic method

A non-precious metal and synthesis method technology, applied in the field of monolithic porous double-effect non-precious metal full electrolysis water catalyst and its synthesis, can solve the problems of single catalytic function, poor stability, performance degradation, etc., achieve low energy consumption and reduce system complexity degree and manufacturing cost, and the effect of versatility

Inactive Publication Date: 2019-01-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of the existing bimetallic layered hydroxide electrolysis water catalyst, such as single catalytic function, poor conductivity, poor stability, and electrode structure limiting the intrinsic performance of the catalyst, the present invention provides a catalyst based on MXene and bimetallic layered hydroxide The monolithic porous double-effect non-precious metal all-electrolyte water catalyst and its synthesis method. The prepared catalyst is composed of porous nickel foam with bimetallic layered hydroxide nanostructure and MXene uniformly deposited on the surface. It has a three-dimensional hierarchical porous structure and can Directly used as working electrode to catalyze water splitting
Among them, LDH grows vertically on the surface of MXene, which overcomes the problems of poor conductivity of LDH and easy agglomeration during the preparation and reaction process, which leads to performance degradation, and solves the basic problems that plague the performance and application of LDH-based catalysts. Excellent catalytic activity and stability for both OER and HER during the process

Method used

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  • A monolithic porous dual-effect non-noble metal catalyst for water full-electrolysis and a synthetic method
  • A monolithic porous dual-effect non-noble metal catalyst for water full-electrolysis and a synthetic method
  • A monolithic porous dual-effect non-noble metal catalyst for water full-electrolysis and a synthetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Preparation method of composite nano catalyst based on MXene and NiFe-LDH

[0033] 1) Soak the foamed nickel into MXene dispersion, the concentration of MXene dispersion is 3mg mL -1 After being soaked for 30 minutes at room temperature, vacuum drying was carried out to obtain a foamed nickel electrode coated with MXene. The thickness of the MXene layer was about 300nm.

[0034] 2) The MXene-coated nickel foam prepared in step 1) is directly used as the working electrode, the platinum sheet is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolyte is 6 mol L -1 Of nickel nitrate and 6mol L -1 For the mixed solution of ferric nitrate, the voltage used for electrodeposition is -1V and the time is 300s. NiFe-LDH nanometers with a size of about 200-300nm are grown vertically on the surface of the MXene sheet, and the load is 0.2mg cm -2 .

Embodiment 2

[0035] Example 2 Preparation method of composite nano catalyst based on MXene and NiV-LDH

[0036] 1) Soak the foamed nickel into MXene dispersion, the concentration of MXene dispersion is 5mg mL -1 After being immersed for 30 minutes at room temperature, vacuum drying was carried out to obtain a foamed nickel electrode coated with MXene. The thickness of the MXene layer was about 400nm.

[0037] 2) The MXene-coated nickel foam prepared in step 1) is directly used as the working electrode, the platinum sheet is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolyte is 9 mol L -1 Nickel nitrate and 3mol L -1 For the mixed solution of vanadium trichloride, the voltage used for electrodeposition is -0.8V and the time is 360s. NiV-LDH nanosheets with a size of about 100-200nm are grown vertically on the surface of the MXene sheet, and the load is 0.2mg cm -2 .

Embodiment 3

[0038] Example 3 Preparation method of composite nano catalyst based on MXene and NiCo-LDH

[0039] 1) Soak the foamed nickel into MXene dispersion, the concentration of MXene dispersion is 8mg mL -1 After immersing for 30 minutes at room temperature, vacuum drying is used to obtain a foamed nickel electrode coated with MXene. The thickness of the MXene layer is about 550 nm.

[0040] 2) The MXene-coated nickel foam prepared in step 1) is directly used as the working electrode, the platinum sheet is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolyte is 6 mol L -1 Nickel nitrate and 3mol L -1 For the mixed solution of cobalt nitrate, the voltage used for electrodeposition is -1V and the time is 60s. NiCo-LDH nanosheets with a size of about 50-100nm are grown vertically on the surface of the MXene sheet, and the load is 0.05mg cm -2 .

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Abstract

A monolithic porous dual-effect non-noble metal catalyst for water full-electrolysis and a synthetic method are provided, belonging to the fields of nanometer materials and catalysis. The catalyst includes a surface uniformly deposited dual-metal layered hydroxide nanometer structure and MXene porous foamed nickel, and has a three-dimensional graded porous structure. The method includes uniformlycovering three-dimensional porous foamed nickel with MXene, then covering the foamed nickel covered with the MXene with the dual-metal layered hydroxide nanometer structure through electro-depositionto obtain the monolithic porous non-noble metal electrocatalyst with precisely controllable structure and components. The electrocatalyst obtained by the method can effectively overcome a problem thatdual-metal layered hydroxides are liable to stack and agglomerate and poor in electrical conductivity so that catalytic performance decreases, shows excellent catalytic activity and stability for hydrogen evolution and oxygen evolution in an alkaline electrolyte, and can be directly applied in a water full-electrolysis system under a condition that an adhesive is not needed.

Description

Technical field [0001] The invention belongs to the field of nano materials, energy and catalysis, and relates to a monolithic porous double-effect non-noble metal full electrolyzed water catalyst based on MXene and bimetal layered hydroxide and a synthesis method thereof. Background technique [0002] Hydrogen energy is regarded as one of the most potential new energy sources in the 21st century because of its clean, high efficiency, safety, and sustainability advantages. Compared with traditional industrial hydrogen production methods such as coal gasification hydrogen production, natural gas steam reforming hydrogen production, etc., electrolyzed water hydrogen production technology has unique advantages due to its clean and efficient process, high hydrogen purity, and coupling with renewable energy power generation systems. , Is regarded as one of the most promising hydrogen production technologies. The improvement of the efficiency of the water electrolysis process is mainl...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/33B01J35/60Y02E60/36
Inventor 王治宇邱介山于梦舟
Owner DALIAN UNIV OF TECH
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