Fe-doped novel two-dimensional Co-MOFs composite material as well as preparation method and application thereof

A composite material and a new technology, applied in the field of electrochemical materials, can solve problems such as affecting the catalytic effect of catalysts, achieve excellent OER electrocatalytic activity and stability, enhance electrocatalytic performance, and improve OER performance.

Active Publication Date: 2022-07-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for bulk bimetallic MOFs, most of the metal sites are deeply buried inside the material and cannot contact the electrolyte, which seriously affects the catalytic performance of the catalyst.

Method used

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  • Fe-doped novel two-dimensional Co-MOFs composite material as well as preparation method and application thereof
  • Fe-doped novel two-dimensional Co-MOFs composite material as well as preparation method and application thereof
  • Fe-doped novel two-dimensional Co-MOFs composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) 3,6-bis(pyridin-3-yl)-1,2,4,5-tetrazine (bptz) (0.0118g, 0.05mmol) was added to 2mL of DMF solution, stirred well, and then in a stirring state 4,4'-dicarboxydiphenyl ether (H 2 oba) (0.0129g, 0.05mmol) solution to obtain a mixed solution;

[0039] (2) After step (1), cobalt acetate (Co(OAc) dissolved in 2 mL of DMF was added to the mixed solution 2 ·6H 2 O) (0.0125g, 0.05mmol), stirred for 30 minutes to obtain a reaction solution;

[0040] (3) transferring the reaction solution obtained after step (2) into a polytetrafluoroethylene hydrothermal reaction kettle, and reacting at a constant temperature of 85 °C for 72 hours; programmatically lowered to room temperature at a speed of 5 °C / h to obtain a mixed solution a;

[0041] (4) filtering the mixed solution a obtained after the step (3), washing the obtained solid matter with deionized water and DMF in turn, and finally putting it into an oven for drying to obtain a novel Co-based two-dimensional metal-organic f...

Embodiment 2

[0051] In this example, the preparation method of the novel two-dimensional Co-based metal-organic frameworks (Co-MOFs) is exactly the same as that in Example 1, the difference is that the reaction solution is in a polytetrafluoroethylene hydrothermal reactor at a constant temperature of 85°C. The reaction time is 48h, and the doping method is also the same as the preparation method in Example 1, the difference is the doped ferrous sulfate FeSO 4 ·7H 2 The amount of O was 0.0184 g (0.067 mmol).

[0052] The XRD patterns of the Fe-doped new two-dimensional Co-MOFs composites (Fe@Co-MOFs-2) composites prepared above are as follows: Figure 4 shown.

[0053] The composite Fe@Co-MOFs-2 prepared above was tested for OER performance. The test method was the same as the test method in Example 1. The test results showed that the Fe@Co-MOFs-2 composite material of this example was tested at 50 mA cm. -2 Under the current density of , the overpotential is between 270 and 290 mV, such...

Embodiment 3

[0055] In this example, the preparation method of the novel two-dimensional Co-based metal organic frameworks (Co-MOFs) is exactly the same as that in Example 1, and the doping method is also the same as the preparation method in Example 1, the difference is the doping method. Ferrous sulfate FeSO 4 ·7H 2 The amount of O was 0.0278 g (0.1 mmol).

[0056] The XRD patterns of the Fe-doped new 2D Co-MOFs composites (Fe@Co-MOFs-3) prepared above are as follows: Figure 4 shown. With the increase of Fe doping amount, the crystallinity of the as-prepared composite material gradually decreased until it became an amorphous material Fe@Co-MOFs-3.

[0057] The dark-field high-resolution transmission electron microscopy (HRTEM) images (200 nm and 2 nm) of the composite Fe@Co-MOsFs-3 prepared above are as follows Figure 5 As shown, the 2 nm map clearly reflects the amorphous structure of Fe@Co-MOFs-3.

[0058] The mapping image of the dark-field high-resolution transmission electron...

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Abstract

The invention provides a Fe-doped novel two-dimensional Co-MOFs composite material as well as a preparation method and application thereof. The composite material takes a novel two-dimensional Co-MOFs crystal material as a carrier, an Fe element is doped and distributed on the carrier, and after the Fe element is doped in a Co-based metal organic framework material with a two-dimensional framework crystal structure, the obtained composite material has an amorphous structure, and the Co element and the Fe element are uniformly distributed in the amorphous structure. The composite material has good electrochemical catalysis oxygen evolution performance under alkaline conditions, is still stable after 11 hours of circulation, and can be used as an alkaline OER electrocatalyst.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and in particular relates to a composite material of Fe-doped novel two-dimensional Co-MOFs, a preparation method and application thereof, and especially the application as an alkaline OER electrocatalyst. Background technique [0002] Metal-Organic Frameworks (MOFs), as unique porous coordination polymers, have the characteristics of diverse structures, high specific surface area, modifiable pore surface, and adjustable pore size. Material. Recently, metal-organic frameworks (MOFs) have attracted increasing attention in energy-related applications due to their tunable porosity and diversity of coordination bonds between metal ions and organic ligands. [0003] Electrochemical water splitting to produce hydrogen is the key to developing sustainable energy conversion and storage technologies. However, the sluggish oxygen evolution reaction (OER) kinetics severely restricts the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C25B11/095C25B1/04
CPCC08G83/008C25B11/095C25B1/04Y02E60/36
Inventor 刘宇奇代思玉王新颖李玮金楠皓李杨华陈寒赵越刘小铭
Owner KUNMING UNIV OF SCI & TECH
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