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Preparation method and application of hierarchical porous nickel-based metal-organic framework electrocatalytic materials

A technology of hierarchical porous and electrocatalytic materials, applied in electrodes, electrolytic components, electrolytic processes, etc., can solve problems such as low conductivity, failure to meet industrial production standards, and unsatisfactory nano-morphology, and achieve low production costs and excellent Electrocatalytic performance, the effect of realizing electron transfer

Active Publication Date: 2022-02-11
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, nickel-based MOF catalysts have attracted more and more attention due to their excellent activity and wide range of sources, but single nickel metal materials have limited number of catalytic active sites, unsatisfactory nano-morphology, and extremely low electrical conductivity. It cannot be directly used as an electrocatalyst for the anode oxygen evolution reaction, and cannot reach industrial production standards (the current density is 500mA cm -2 , the overpotential is less than 300mV)

Method used

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  • Preparation method and application of hierarchical porous nickel-based metal-organic framework electrocatalytic materials
  • Preparation method and application of hierarchical porous nickel-based metal-organic framework electrocatalytic materials
  • Preparation method and application of hierarchical porous nickel-based metal-organic framework electrocatalytic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation of NiFe-MOF Oxygen Evolution Catalyst

[0033] Weigh 80 mg of 1,4-terephthalic acid powder and dissolve it in a mixed solvent composed of 16mL N,N dimethylformamide and 8mL acetonitrile, stir and dissolve at room temperature for 2h to obtain solution A; measure 8mL N , N dimethylformamide and 8mL acetonitrile, stirred at room temperature for 2h to obtain solution B; weigh appropriate amount of nickel acetate tetrahydrate and ferrous acetate and dissolve them in 8mL N, N dimethylformamide and 16mL acetonitrile In the mixed solvent, stir well at room temperature for 2 h to obtain solution C. Then, during the stirring process, take 3mL of solution A and drop it into the bottom of the glass bottle, take 2mL of solution B and put it on the upper layer of solution A to form the intermediate layer solution, take 3mL of solution C on the upper layer of solution B, and place the glass bottle that has been clearly stratified Under low temperature environme...

Embodiment 2

[0034] Example 2: Preparation of NiCo-MOF Oxygen Evolution Catalyst

[0035] Weigh 80 mg of 1,4-terephthalic acid powder and dissolve it in a mixed solvent composed of 16mL N,N dimethylformamide and 8mL acetonitrile, stir and dissolve at room temperature for 2h to obtain solution A; measure 8mL N , N dimethylformamide and 8mL acetonitrile, stirred at room temperature for 2h to obtain solution B; weigh appropriate amount of nickel acetate tetrahydrate and cobalt acetate tetrahydrate and dissolve them in 8mL N, N dimethylformamide and 16mL acetonitrile to form In the mixed solvent of , fully stirred at room temperature for 2 h to obtain solution C. Then, during the stirring process, take 3mL of solution A and drop it into the bottom of the glass bottle, take 2mL of solution B and put it on the upper layer of solution A to form the intermediate layer solution, take 3mL of solution C on the upper layer of solution B, and place the glass bottle that has been clearly stratified Und...

Embodiment 3

[0036] Embodiment 3: Preparation of NiCu-MOF oxygen evolution catalyst

[0037] Weigh 80 mg of 1,4-terephthalic acid powder and dissolve it in a mixed solvent composed of 16mL N,N dimethylformamide and 8mL acetonitrile, stir and dissolve at room temperature for 2h to obtain solution A; measure 8mL N , N dimethylformamide and 8mL acetonitrile, stirred at room temperature for 2h to obtain solution B; weigh appropriate amount of nickel acetate tetrahydrate and copper acetate monohydrate and dissolve them in 8mL N,N dimethylformamide and 16mL acetonitrile to form In the mixed solvent of , fully stirred at room temperature for 2 h to obtain solution C. Then, during the stirring process, take 3mL of solution A and drop it into the bottom of the glass bottle, take 2mL of solution B and put it on the upper layer of solution A to form the intermediate layer solution, take 3mL of solution C on the upper layer of solution B, and place the glass bottle that has been clearly stratified Un...

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Abstract

The invention provides a preparation method and application of a graded porous nickel-based metal-organic framework electrocatalytic material. By controlling the layering of the liquid phase interface at low temperature, the solution density between different layers is adjusted, and under the effect of diffusion control, The metal ions in the upper layer and the ligand molecules in the bottom layer undergo a coordination reaction at the interface of the middle layer, and the reaction products are precipitated in the bottom layer, and then collected by simple centrifugation to obtain nickel-based metal-organic framework electrocatalytic materials (Ni‑M‑MOFs, M =Fe, Co, Cu, Mn, Zn), which can be directly used as an efficient electrocatalyst for the anode oxygen evolution reaction (OER) of water electrolysis in alkaline environment. The preparation method is easy to operate, low in cost and has a certain degree of universality, which is of great significance for promoting the efficient utilization of clean and renewable energy and rationally designing devices such as fuel cells, metal-air batteries, and water electrolyzers.

Description

technical field [0001] The invention belongs to the field of chemical energy materials, and in particular relates to the preparation of metal organic framework electrocatalytic materials, in particular to a preparation method of hierarchical porous nickel-based metal organic framework electrocatalytic materials for catalyzing the anode oxygen precipitation reaction of electrolyzed water. Background technique [0002] With the increasingly serious environmental pollution caused by the depletion of fossil fuels, it is imminent to develop a new type of alternative clean energy. As a sustainable and environmentally friendly clean energy with the highest combustion value and energy density, hydrogen is favored by researchers. How to efficiently prepare hydrogen has become a research hotspot in recent years. The technology of hydrogen production by electrolysis of water has become an ideal way to produce hydrogen energy in the future because of its advantages such as abundant raw ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/085
CPCC25B1/04Y02E60/36Y02P20/133
Inventor 黄明华周健
Owner OCEAN UNIV OF CHINA
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