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Heterojunction nano array electrode material and preparation method and application thereof

A nano-array and electrode material technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of limited activity and achieve the effects of rapid response, accelerated charge transport, and effective electronic structure

Pending Publication Date: 2022-06-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome existing δ-MnO 2 The defects and deficiencies of the limited intrinsic activity of the electrocatalytic material provide a heterojunction nanoarray electrode that can effectively regulate the electronic structure, improve the intrinsic activity, promote charge transport, and provide more active sites to achieve high-performance OER. Material

Method used

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  • Heterojunction nano array electrode material and preparation method and application thereof
  • Heterojunction nano array electrode material and preparation method and application thereof
  • Heterojunction nano array electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 δ-MnO 2 / FeOOH heterojunction nanoarray electrodes

[0044] The δ-MnO 2 The preparation method of FeOOH heterojunction nano-array electrode comprises the following steps:

[0045] S1, 0.158g (1mmol) potassium permanganate (KMnO 4 ) was dissolved in 30mL of deionized water, fully stirred on a magnetic stirrer for 0.5h (the stirrer speed was 300r / min) to obtain a uniform mixed solution;

[0046] S2. Transfer the mixed solution obtained in step S1 to a polytetrafluoroethylene high-pressure reaction kettle, put a piece of cleaned iron net, seal it and place it in a blast drying oven for hydrothermal reaction, react at 130°C for 7h, and react After the end, let it cool naturally, wash it with N,N-dimethylformamide for 3 times, and dry it at 70°C for 2 hours to obtain δ-MnO on the iron grid. 2 / FeOOH heterojunction nanoarray electrodes.

[0047] Material Characterization:

[0048] The product was identified by X-ray powder diffractometer, and its crystal phase...

Embodiment 2

[0049] Example 2δ-MnO 2 / Ni-FeOOH heterojunction nanoarray electrode

[0050] The δ-MnO 2 The preparation method of Ni-FeOOH heterojunction nano-array electrode comprises the following steps:

[0051] S1, 1.783g (7.5mmol) nickel chloride (NiCl 2 ·6H 2 O) and 11.852g (75mmol) potassium permanganate (KMnO 4 ) was dissolved in 150mL of deionized water, fully stirred on a magnetic stirrer for 3h (the stirrer speed was 500r / min) to obtain a uniform mixed solution;

[0052] S2. Transfer the mixed solution obtained in step S1 to a polytetrafluoroethylene high-pressure reaction kettle, put a piece of washed foam iron, seal it and place it in a blast drying oven for hydrothermal reaction, react at 180°C for 3h, and react After the end, let it cool down naturally, wash with ethanol for 3 times, and dry at 60°C for 6 hours to obtain δ-MnO grown on foam iron 2 / Ni-FeOOH heterojunction nanoarray electrodes.

[0053] Material Characterization:

[0054] The morphology of the obtained...

Embodiment 3

[0055] Example 3δ-MnO 2 / Zn-FeOOH heterojunction nano-array electrode

[0056] The δ-MnO 2 The preparation method of Zn-FeOOH heterojunction nano-array electrode comprises the following steps:

[0057] S1, 2.195g (10mmol) zinc acetate (Zn(CH 3 COO) 2 2H 2 O) and 7.901g (50mmol) potassium permanganate (KMnO 4 ) was dissolved in 500mL of deionized water, fully stirred on a magnetic stirrer for 3h (the stirrer speed was 650r / min) to obtain a uniform mixed solution;

[0058] S2. Transfer the mixed solution obtained in step S1 to a polytetrafluoroethylene high-pressure reaction kettle, put several clean iron wires, seal it and place it in a blast drying oven for hydrothermal reaction, and react at 150° C. for 4 hours. After the reaction, let it cool down naturally, wash with methanol for 3 times, and dry at 50°C for 3 hours to obtain δ-MnO that grows on the iron wire. 2 / Zn-FeOOH heterojunction nanoarray electrodes.

[0059] Material Characterization:

[0060] The morpholo...

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Abstract

The invention belongs to the technical field of electrocatalytic oxygen evolution electrode materials, and particularly relates to a heterojunction nano array electrode material and a preparation method and application thereof. According to the preparation method, the iron-based current collector is placed in the potassium permanganate aqueous solution, the heterojunction nano array electrode material is obtained through the hydrothermal reaction, and the one-step hydrothermal method adopted in the method has the advantages of being economical, rapid, green, simple, rapid in reaction and capable of being produced on a large scale; wherein the iron-based current collector serves as a carrier and also serves as an iron source, and in-situ growth of an array on the current collector can be realized, so that the mechanical stability of an electrode material is improved, and charge transfer is accelerated. According to the obtained heterojunction nano array electrode material, delta-MnO2 and TM-FeOOH which are good in stability are coupled together to construct a heterojunction, an electronic structure can be effectively regulated and controlled, intrinsic activity can be improved, charge transfer can be promoted, more active sites can be provided, and therefore high-performance OER application is achieved.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic oxygen evolution electrode materials. More specifically, it relates to a heterojunction nano-array electrode material and its preparation method and application. Background technique [0002] Hydrogen energy is a green energy that is expected to solve the fossil energy crisis and alleviate environmental pollution problems in the 21st century. Electrocatalytic water splitting to produce hydrogen is an effective method to achieve large-scale production of high-purity hydrogen. Anode oxygen evolution reaction (OER, 4OH) in electrolyzed water - →O 2 +2H 2 O+4e - ) is a multi-electron reaction process with slow kinetics and requires high overpotentials, resulting in low electrical energy conversion. Current IrO 2 and RuO 2 Base precious metal catalysts show excellent performance in OER, such as the Chinese patent application discloses a CrO 2 -RuO 2 The solid solution material has a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/061C25B11/091C25B1/04
CPCC25B11/061C25B11/091C25B1/04
Inventor 李萍李吉鑫黄钰淇黄蕖骅赵世恩李文琴
Owner SUN YAT SEN UNIV
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