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Preparation method of iron-based MOFs oxygen evolution electrocatalyst with high-activity crystal face proportion, and catalyst

An electrocatalyst, high-activity technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of decreased stability, difficulty in meeting environmental friendliness, cost saving, affecting material uniformity and crystallinity, etc.

Active Publication Date: 2021-07-06
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of iron-based MOFs oxygen evolution electrocatalyst with high-activity crystal face proportion, and catalyst
  • Preparation method of iron-based MOFs oxygen evolution electrocatalyst with high-activity crystal face proportion, and catalyst
  • Preparation method of iron-based MOFs oxygen evolution electrocatalyst with high-activity crystal face proportion, and catalyst

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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 of an iron-based MOFs oxygen evolution electrocatalyst with a high-activity crystal face proportion, and the catalyst, and belongs to the technical field of oxygen evolution electrocatalysts. The method comprises the following steps: weighing ferric salt and an organic ligand fumaric acid according to the molar ratio of iron ions to fumaric acid of 1: (64-128), dissolving the ferric salt and the organic ligand fumaric acid in an N, N-dimethylformamide solvent, and uniformly stirring to obtain a mixed solution; carrying out solvothermal reaction on the obtained mixed solution at a certain reaction temperature for a period of time, and naturally cooling to room temperature; and washing the obtained product with absolute ethyl alcohol, and then drying and collecting to obtain the product which is the iron-based MOFs oxygen evolution electrocatalyst. The iron-based MOFs electrocatalyst with the high active crystal face exposure proportion can be synthesized in situ by regulating and controlling the proportion of the metal Fe ions and the organic ligand fumaric acid and using a mild solvothermal method, the preparation method is mild, simple and easy to operate, and the purpose of regulating and controlling the crystal face can be achieved without additionally introducing a surfactant.

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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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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