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Preparation method of self-supporting coralline-like array structure electrode

An array structure, coral-like technology, applied in the field of catalyst preparation, can solve problems such as pollution, urea abuse, energy shortage, etc., achieve broad application prospects, stable product quality, and improve the effect of urea pollution problems

Active Publication Date: 2021-09-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of urea abuse, serious pollution, and energy shortage in the environment, the present invention is based on the electrochemical degradation method, and proposes a preparation method of a self-supporting coral-like array structure dual-function electrode, which simultaneously realizes hydrogen precipitation at the cathode and degradation of urea at the anode

Method used

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  • Preparation method of self-supporting coralline-like array structure electrode
  • Preparation method of self-supporting coralline-like array structure electrode
  • Preparation method of self-supporting coralline-like array structure electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Preparation of the precursor array structure: use nickel foam as the substrate, rinse with 5% dilute nitric acid, ethanol and deionized water three times, remove the surface organic impurities and oxide layer, dry naturally, weigh 0.9g of nickel nitrate hexahydrate , 0.4g of cerium nitrate hexahydrate, 1.2g of urea, and 0.4g of ammonium fluoride were dispersed in 30mL of deionized water, transferred to a 50mL reaction kettle, stirred evenly and dissolved, and the nickel foam was transferred to it and packaged, transferred to an oven, and kept at a constant temperature Keep at 100°C for 8 hours, then cool down naturally. The product was taken out from the reaction kettle, rinsed repeatedly with deionized water and ethanol, and dried in a vacuum oven to prepare a nickel hydroxide / ceria nanosheet array.

[0026] (2) Preparation of nickel phosphide / ceria-like coral-like nano-arrays: put the nickel hydroxide / ceria nanosheet arrays obtained in step (1) into a porcelain bo...

Embodiment 2

[0028] (1) Preparation of the precursor array structure: use nickel foam as the substrate, rinse with 15% dilute nitric acid, ethanol and deionized water five times, remove the surface organic impurities and oxide layer, dry naturally, weigh nickel nitrate hexahydrate 1.4 g, 0.65g of cerium nitrate hexahydrate, 1.8g of urea, and 0.7g of ammonium fluoride were dispersed in 30mL of deionized water, transferred to a 50mL reaction kettle, stirred and dissolved evenly, and the nickel foam was transferred to it and packaged, transferred to an oven, Maintain a constant temperature of 120°C for 10 hours, then cool down naturally. The product was taken out from the reaction kettle, rinsed repeatedly with deionized water and ethanol, and dried in a vacuum oven to prepare a nickel hydroxide / ceria nanosheet array.

[0029] (2) Preparation of nickel phosphide / ceria-like coral-like nano-arrays: put the nickel hydroxide / ceria nanosheet arrays obtained in step (1) into a porcelain boat, put 8...

Embodiment 3

[0031] (1) Preparation of the precursor array structure: use nickel foam as the substrate, rinse with 30% dilute nitric acid, ethanol and deionized water five times, remove the surface organic impurities and oxide layer, dry naturally, weigh nickel nitrate hexahydrate 1.8 g, 0.9g of cerium nitrate hexahydrate, 2.4g of urea, and 0.9g of ammonium fluoride were dispersed in 80mL of deionized water, transferred to a 100mL reaction kettle, stirred and dissolved evenly, and the nickel foam was transferred to it and packaged, transferred to an oven, Keep the constant temperature at 100°C for 6 hours, then cool down naturally. The product was taken out from the reaction kettle, rinsed repeatedly with deionized water and ethanol, and dried in a vacuum oven to prepare a nickel hydroxide / ceria nanosheet array.

[0032] (2) Preparation of nickel phosphide / ceria-like coral-like nano-arrays: put the nickel hydroxide / ceria nanosheet arrays obtained in step (1) into a porcelain boat, put 100 ...

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Abstract

The invention provides a preparation method of a self-supporting coralline-like array structure electrode. The self-supporting coralline-like array structure electrode is used for preparing and degrading pollutant urea through electro-catalysis of hydrogen energy. The construction of a nickel phosphide / cerium dioxide heterojunction can adjust the charge structure of an intrinsic catalyst and accelerate the charge transfer in the reaction process, the formation of the interface can form more active sites, and thus the catalytic performance of the material is significantly improved. As a bifunctional catalyst, the material achieves degradation of urea in sewage and energy-saving hydrogen production at the same time. Under the anode voltage, urea is oxidized and decomposed into carbon dioxide, nitrogen, water and other pollution-free substances, and hydrogen is separated out from a cathode. In an alkaline electrolyte, due to the addition of urea, the potential required by hydrogen production of the cathode under the same current is greatly reduced. And secondly, through an in-situ growth technology, the catalytic activity and stability of the catalyst are improved, and the method has profound significance for further realizing the industrialization of urea degradation and energy-saving hydrogen production. The preparation method has the advantages of simple equipment, easiness in realization and control, good process repeatability, stable product quality and the like, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to the preparation of a self-supporting coral-like array structure electrode and its application as a dual-function electrode for electrocatalytic hydrogen energy production and oxidative degradation of pollutant urea. Background technique [0002] Currently, hydrogen energy is considered as an ideal alternative energy carrier to traditional fossil fuels due to its environmental efficiency and high energy density. Compared with the traditional hydrogen production method with serious environmental pollution, electrolysis of water to produce hydrogen is a promising method for high-purity hydrogen production. Generally, water electrolysis includes cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER), both of which, especially the OER process, require additional energy to overcome the reaction barrier. Therefore, highly active e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/031C25B1/04C25B11/052C25B11/061C25B11/091C02F1/461C01F17/235C01F17/10C01B25/08B82Y40/00B82Y30/00
CPCC25B11/031C25B1/04C25B11/052C25B11/061C25B11/091C02F1/46109C01B25/08C01F17/235C01F17/10B82Y40/00B82Y30/00C02F2101/38C02F2101/34C02F2001/46142C01P2004/80Y02E60/36
Inventor 郑金龙吕超杰成伽润吴凯利
Owner UNIV OF SCI & TECH BEIJING
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