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Preparation method and application of amorphous cobalt borate nanorod high-efficiency oxygen evolution electrocatalyst

An electrocatalyst, cobalt nanotechnology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of no patents, academic literature, reports, etc., and achieve excellent Electrochemical performance, effect of low onset overpotential

Active Publication Date: 2021-08-06
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, up to now, there are no relevant patents and academic literature reports

Method used

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  • Preparation method and application of amorphous cobalt borate nanorod high-efficiency oxygen evolution electrocatalyst
  • Preparation method and application of amorphous cobalt borate nanorod high-efficiency oxygen evolution electrocatalyst
  • Preparation method and application of amorphous cobalt borate nanorod high-efficiency oxygen evolution electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, the preparation method of the amorphous cobalt borate nanorod electrocatalyzed water desorption oxygen catalyst is as follows:

[0037] (1) Weigh 0.04mol cobalt nitrate hexahydrate and add it to 60mL deionized water, and stir magnetically for 10 minutes at room temperature. After it is completely dissolved, add 0.02mol sodium tetraborate decahydrate to the solution, and stir for 30 minutes to completely dissolve to obtain the reaction Precursor solution.

[0038] (2) The reaction precursor solution prepared in step (1) was transferred to a 100 mL polytetrafluoro-lined stainless steel hydrothermal reaction kettle, and heated and reacted at 180° C. for 16 hours.

[0039] (3) After the reaction is completed, after cooling down to room temperature naturally, the obtained reaction precipitates are centrifuged three times with deionized water and ethanol, and each time is centrifuged at 6000rpm for 10 minutes; deionized water, and transferred to a refrigerat...

Embodiment 2

[0042] In this example, the preparation method of the amorphous cobalt borate nanorod electrocatalyzed water desorption oxygen catalyst is as follows:

[0043] (1) Weigh 0.05mol cobalt nitrate hexahydrate and add it to 60mL deionized water, stir magnetically at room temperature for 10 minutes, after it is completely dissolved, add 0.02mol sodium tetraborate decahydrate to the solution, stir for 30 minutes to completely dissolve to obtain the reaction Precursor solution.

[0044] (2) The reaction precursor solution prepared in step (1) was transferred to a 100 mL polytetrafluoro-lined stainless steel hydrothermal reaction kettle, and heated and reacted at 160° C. for 12 hours.

[0045] (3) After the reaction is finished, after cooling down to room temperature naturally, the obtained reaction precipitates are centrifuged and washed three times with deionized water and ethanol, each time at 10,000 rpm for 20 minutes; deionized water and transferred to a refrigerator for 24 hours...

Embodiment 3

[0048] In this example, the preparation method of the amorphous cobalt borate nanorod electrocatalyzed water desorption oxygen catalyst is as follows:

[0049] (1) Use a pipette gun to add 20 μL of perfluorosulfonic acid resin (nafion) solution to 980 μL of ethanol, then weigh 10 mg of amorphous cobalt borate nanorods prepared in Example 1 and add them to the solution, ultrasonically disperse for 1 hour , to obtain a homogeneously dispersed solution.

[0050] (2) Take 10 μL of the dispersion prepared in step (1), drop it onto a glassy carbon electrode with a diameter of 1.2 mm, and dry it by using an infrared lamp for 30 minutes. Repeat the dropwise addition three times to prepare an electrode.

[0051] (3) Use the CHI660 electrochemical workstation to test the electrocatalytic water desorption oxygen performance of the electrode prepared in step (2), wherein the counter electrode is a stone mill rod, the reference electrode is a Hg / HgO electrode, and the electrolyte is KOH wi...

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Abstract

The invention belongs to the field of electrocatalytic water analysis for oxygen, and specifically relates to a preparation method and application of an amorphous cobalt borate nanorod high-efficiency oxygen analysis electrocatalyst, and intends to solve the defects such as the high price of commonly used noble metal electrocatalysis oxygen analysis catalysts. Using low-cost water-soluble cobalt salt, sodium tetraborate decahydrate as the precursor reactant; using hydrothermal method to control the heating temperature and reaction time; centrifuging the obtained precipitate, and freeze-drying to obtain amorphous cobalt borate nanorods with high efficiency. Oxygen electrocatalyst. The preparation method has the advantages of low cost, environmental protection, simple operation, convenient post-treatment of the product, and easy regulation of the diameter and length of the nanorod. At the same time, the method prepares amorphous cobalt borate nanorods as an efficient oxygen evolution electrocatalyst, which has the advantages of low initial overpotential, low Tafel slope and high stability.

Description

technical field [0001] The invention belongs to the field of electrocatalytic water analysis for oxygen, and in particular relates to a preparation method and application of an amorphous cobalt borate nanorod high-efficiency oxygen analysis electrocatalyst. Background technique [0002] The energy crisis is an important issue facing the sustainable development of modern society, among which electrocatalytic hydrogen evolution and oxygen production is an important way of energy conversion. As for the electrocatalytic hydrogen evolution and oxygen generation, the direct electrolysis of water to produce hydrogen only accounts for 4% of the source of hydrogen energy. Oxygen reactions, respectively, require excellent electrocatalysts to reduce the overpotential for water splitting. At present, the main high-efficiency catalysts still rely on noble metals and their oxides (such as: RuO 2 and IrO 2 ), etc., which are expensive and difficult to be widely used. Therefore, the dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J37/10B82Y30/00B82Y40/00C25B1/04C25B11/075
CPCC25B1/04B82Y30/00B82Y40/00B01J23/75B01J37/10C25B11/069B01J35/33Y02E60/36
Inventor 秦伟周宁芳吴春丁美贾传坤
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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