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Preparation method and catalyst of iron-based mofs oxygen evolution electrocatalyst with high active crystal facet ratio

An electrocatalyst, high activity technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems of environmental friendliness, cost saving, affecting the uniformity and crystallinity of materials, reducing electrocatalytic activity, etc. Catalytic oxygen evolution activity, low cost, low overpotential effect

Active Publication Date: 2022-05-06
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods often introduce toxic or expensive organic additives, and these additives are not easy to be completely removed, and will also affect the uniformity and crystallinity of the material, resulting in a decrease in the electrocatalytic activity and stability of the material, making it difficult to meet environmental friendliness and cost savings. and practical application requirements for improving catalytic efficiency

Method used

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  • Preparation method and catalyst of iron-based mofs oxygen evolution electrocatalyst with high active crystal facet ratio
  • Preparation method and catalyst of iron-based mofs oxygen evolution electrocatalyst with high active crystal facet ratio
  • Preparation method and catalyst of iron-based mofs oxygen evolution electrocatalyst with high active crystal facet ratio

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Experimental program
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Effect test

Embodiment 1-2

[0039] A method for preparing an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal facet ratio, comprising the following steps:

[0040] (1) Weigh ferric nitrate nonahydrate and organic ligand fumaric acid according to the dosage and ratio in Table 1, and dissolve ferric nitrate nonahydrate and fumaric acid in 10ml of N,N-2 In methylformamide solvent, stir evenly to obtain a mixed solution;

[0041] (2) Transfer the mixed solution obtained in step (1) to the reactor lining of 25ml polytetrafluoroethylene; solvothermal reaction at 120°C for 8 hours, and naturally cool to room temperature; Centrifugal cleaning was carried out for 3 times, and then collected after vacuum drying at 30°C for a period of time. The obtained product was an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal facet ratio.

[0042] The mol ratio of table 1 iron ion and organic ligand fumaric acid

[0043]

Embodiment 3

[0045] A method for preparing an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal facet ratio, comprising the following steps:

[0046] (1) Dissolve 0.125 mmol of ferric chloride hexahydrate and 8 mmol of organic ligand fumaric acid in 10 ml of N,N-dimethylformamide solvent under ultrasound, and stir evenly to obtain a mixed solution; In the mixed solution of the present embodiment, the mol ratio of iron ion and organic ligand fumaric acid is 1:64;

[0047] (2) Transfer the mixed solution obtained in step (1) to the reaction kettle lining of 25ml polytetrafluoroethylene; solvothermal reaction at 90°C for 16 hours, and naturally cool to room temperature; Centrifugal cleaning was carried out for 3 times, and then collected after vacuum drying at 30°C for a period of time. The obtained product was an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal facet ratio.

Embodiment 4

[0049] A method for preparing an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal facet ratio, comprising the following steps:

[0050] (1) Dissolve 0.125mmol of ferric nitrate nonahydrate and 8mmol of organic ligand fumaric acid in 10ml of N,N-dimethylformamide solvent under ultrasound, and stir evenly to obtain a mixed solution; In the mixed solution of embodiment, the mol ratio of iron ion and organic ligand fumaric acid is 1:64;

[0051] (2) Transfer the mixed solution obtained in step (1) to the reactor lining of 25ml polytetrafluoroethylene; solvothermal reaction at 150°C for 4 hours, and naturally cool to room temperature; Centrifugal cleaning was carried out for 3 times, and then collected after vacuum drying at 30°C for a period of time. The obtained product was an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal facet ratio.

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Abstract

The invention provides a preparation method and catalyst of an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal plane ratio, and belongs to the technical field of oxygen evolution electrocatalysts. The method is as follows: Weigh iron salt and organic ligand fumaric acid according to the molar ratio of iron ion and fumaric acid as 1:64-128, dissolve them in N,N-dimethylformamide solvent, Stir evenly to obtain a mixed solution; perform a solvothermal reaction on the obtained mixed solution at a certain reaction temperature for a period of time, and naturally cool to room temperature; the obtained product is washed with absolute ethanol, then dried and collected, and the obtained product is the iron-based MOFs oxygen evolution electrocatalyst. In the present invention, by adjusting the ratio of metal Fe ions and organic ligand fumaric acid, a mild solvothermal method can be used to synthesize iron-based MOFs electrocatalysts with a high proportion of active crystal surface exposure in situ. The preparation method is mild, simple and easy Operation and without the need to introduce additional surfactants can achieve the purpose of regulating the crystal plane.

Description

technical field [0001] The invention relates to the technical field of oxygen evolution electrocatalysts, in particular to a preparation method and a catalyst of an iron-based MOFs oxygen evolution electrocatalyst with a high active crystal plane ratio. Background technique [0002] Electrocatalytic oxygen evolution reaction (OER) is crucial for the conversion and storage of new renewable energy sources. Due to the complex four-electron transfer process of OER, its reaction kinetics are slow, requiring a high reaction overpotential, which seriously restricts the efficiency of the entire reaction. Therefore, there is an urgent need to develop new efficient and stable OER electrocatalysts to replace the traditional scarce noble metal IrO 2 and RuO 2 base catalyst. To date, a large number of materials including transition metal-based oxides, hydroxides, phosphides, sulfides, and metal-organic frameworks (MOFs) have been explored as OER electrocatalysts. Among them, MOFs hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/052C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 蔡丹丹李芳刘鑫锵肖果蕾
Owner GUANGXI NORMAL UNIV
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